MAA


Line plots across dimensions of each concept
Tables

Table of contents



us-gaap:CommonStockSharesIssued

us-gaap:CommonStockSharesOutstanding

us-gaap:CommonStockSharesAuthorized

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding
us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:EarningsPerShareBasic
us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:EarningsPerShareDiluted
us-gaap:PartnerTypeOfPartnersCapitalAccount
us-gaap:StatementBusinessSegments
us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax

us-gaap:Revenues
us-gaap:PartnerTypeOfPartnersCapitalAccount
us-gaap:StatementBusinessSegments

us-gaap:GeneralAndAdministrativeExpense
us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:InterestExpense
us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:OtherNonoperatingIncomeExpense
us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest

us-gaap:IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity

us-gaap:IncomeTaxExpenseBenefit
us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:ProfitLoss
us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:ComprehensiveIncomeNetOfTax
us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest

us-gaap:NetIncomeLoss
us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest

us-gaap:Assets
us-gaap:ConsolidatedEntities, us-gaap:ProductOrService
us-gaap:PartnerTypeOfPartnersCapitalAccount
us-gaap:StatementBusinessSegments

us-gaap:Liabilities
us-gaap:ConsolidatedEntities, us-gaap:ProductOrService
us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:StockholdersEquity

us-gaap:CashAndCashEquivalentsAtCarryingValue
us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:Land
us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:StockholdersEquity

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax
us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:NetCashProvidedByUsedInOperatingActivities
us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:NetCashProvidedByUsedInInvestingActivities
us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:NetCashProvidedByUsedInFinancingActivities
us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:NetCashProvidedByUsedInOperatingActivities
us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:NetIncomeLoss
us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:ProfitLoss
us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:DepreciationDepletionAndAmortization
us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:NetCashProvidedByUsedInInvestingActivities
us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:NetCashProvidedByUsedInFinancingActivities
us-gaap:PartnerTypeOfPartnersCapitalAccount
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber

us-gaap:ShareBasedCompensation
us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents
us-gaap:PartnerTypeOfPartnersCapitalAccount

maa:AdjustedIncomeLossFromContinuingOperationsAvailableForCommonShareholdersBasic
us-gaap:PartnerTypeOfPartnersCapitalAccount

maa:AdjustedIncomeLossFromContinuingOperationsAvailableForCommonShareholdersDiluted
us-gaap:PartnerTypeOfPartnersCapitalAccount
us-gaap:ConsolidatedEntities, us-gaap:PartnerCapitalComponents
maa:AdjustmentForLimitedPartnersCapitalAtRedemptionValue
us-gaap:ConsolidatedEntities
maa:AmortizationUnearnedCompensation
us-gaap:ConsolidatedEntities, us-gaap:PartnerCapitalComponents
us-gaap:PartnerTypeOfPartnersCapitalAccount
us-gaap:PartnerTypeOfPartnersCapitalAccount, us-gaap:StatementEquityComponents
us-gaap:PartnerTypeOfPartnersCapitalAccount
maa:BasicEarningsPerUnit
us-gaap:PartnerTypeOfPartnersCapitalAccount
maa:DilutedEarningsPerUnit
us-gaap:ConsolidatedEntities
maa:Distributions
us-gaap:ConsolidatedEntities, us-gaap:PartnerCapitalComponents
us-gaap:ConsolidatedEntities
maa:EffectOnRetainedEarningsAccumulatedDeficitDueToFairValueOptionAndMeasurement
us-gaap:ConsolidatedEntities, us-gaap:PartnerCapitalComponents
us-gaap:PartnerTypeOfPartnersCapitalAccount
us-gaap:PartnerTypeOfPartnersCapitalAccount, us-gaap:StatementEquityComponents

maa:GainLossOnSaleOfNonDepreciableRealEstateAssets
us-gaap:PartnerTypeOfPartnersCapitalAccount

maa:GainOnSaleOfNonDepreciableAssets
us-gaap:PartnerTypeOfPartnersCapitalAccount
us-gaap:ConsolidatedEntities, us-gaap:PartnerCapitalComponents
maa:GeneralPartnershipUnitsIssuedInExchangeForLimitedPartnershipUnits
us-gaap:PartnerTypeOfPartnersCapitalAccount
maa:IncomeFromContinuingOperationsAllocatedToUnvestedRestrictedShares

maa:IncomeLossFromContinuingOperationsAllocatedToUnvestedRestrictedShares

maa:IncomeLossFromContinuingOperationsBeforeEquityMethodInvestments
us-gaap:PartnerTypeOfPartnersCapitalAccount

maa:IncomefromContinuingOperationsAttributabletoNoncontrollingInterest

maa:IncomefromContinuingOperationsIncludingPortionAttributabletoNoncontrollingInterest
us-gaap:PartnerTypeOfPartnersCapitalAccount, us-gaap:StatementEquityComponents
maa:NetIncomeAttributabletoNoncontrollingInterest
us-gaap:PartnerTypeOfPartnersCapitalAccount, us-gaap:StatementEquityComponents
maa:NetIncomeAttributabletoParent
us-gaap:ConsolidatedEntities
maa:NetIncomeAvailableForCommonUnitholders
us-gaap:PartnerTypeOfPartnersCapitalAccount
maa:NetIncomeIncludingPortionAttributabletoNoncontrollingInterest

maa:OperatingCostsAndExpensesExcludingDepreciationAndAmortization
us-gaap:PartnerTypeOfPartnersCapitalAccount

maa:OperatingIncomeBeforeDepreciation
us-gaap:StatementBusinessSegments

maa:PaymentsToAcquireRealEstateAndOtherAssets
us-gaap:PartnerTypeOfPartnersCapitalAccount
us-gaap:PartnerTypeOfPartnersCapitalAccount
maa:PreferredUnitDividendsIncomeStatementImpact

maa:PropertyOperatingExpenses
us-gaap:PartnerTypeOfPartnersCapitalAccount
us-gaap:ConsolidatedEntities
maa:UnitsIssuedDuringPeriodValueNewIssuesNet
us-gaap:ConsolidatedEntities, us-gaap:PartnerCapitalComponents
us-gaap:ConsolidatedEntities
maa:UnitsIssuedDuringPeriodValueUnitOptionsExercised
us-gaap:ConsolidatedEntities, us-gaap:PartnerCapitalComponents
us-gaap:ConsolidatedEntities
maa:UnitsRepurchasedAndRetiredDuringPeriodValue
us-gaap:ConsolidatedEntities, us-gaap:PartnerCapitalComponents

us-gaap:AmortizationOfDebtDiscountPremium
us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect
us-gaap:PartnerTypeOfPartnersCapitalAccount
us-gaap:PartnerTypeOfPartnersCapitalAccount
us-gaap:CommonStockDividendsPerShareDeclared

us-gaap:ConstructionInProgressExpendituresIncurredButNotYetPaid
us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:ConversionOfStockAmountConverted1
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:DebtInstrumentBasisSpreadOnVariableRate1
us-gaap:Range, us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:DepreciationAndAmortization
us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:DerivativeGainLossOnDerivativeNet
us-gaap:HedgingDesignation, us-gaap:IncomeStatementLocation
us-gaap:PartnerTypeOfPartnersCapitalAccount
us-gaap:HedgingDesignation, us-gaap:IncomeStatementLocation
us-gaap:DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
us-gaap:ConsolidatedEntities, us-gaap:PartnerCapitalComponents
us-gaap:DistributionMadeToLimitedPartnerDistributionsDeclaredPerUnit
us-gaap:PartnerTypeOfPartnersCapitalAccount
us-gaap:DividendsCommonStock
us-gaap:PartnerTypeOfPartnersCapitalAccount, us-gaap:StatementEquityComponents

us-gaap:DividendsPreferredStockCash
us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:GainLossOnDispositionOfAssets
us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:GainLossOnSaleOfPropertyPlantEquipment
us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:IncomeLossFromEquityMethodInvestments
us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:IncomeTaxesPaid
us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:InterestCostsCapitalized
us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:InterestPaidNet
us-gaap:PartnerTypeOfPartnersCapitalAccount
us-gaap:Ownership
us-gaap:LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest
us-gaap:PartnerTypeOfPartnersCapitalAccount
us-gaap:MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
us-gaap:PartnerTypeOfPartnersCapitalAccount, us-gaap:StatementEquityComponents
us-gaap:ConsolidatedEntities
us-gaap:MinorityInterestPeriodIncreaseDecrease
us-gaap:ConsolidatedEntities, us-gaap:StatementEquityComponents
us-gaap:PartnerTypeOfPartnersCapitalAccount, us-gaap:StatementEquityComponents
us-gaap:ConsolidatedEntities, us-gaap:PartnerCapitalComponents
us-gaap:NetIncomeLossAllocatedToGeneralPartners
us-gaap:ConsolidatedEntities, us-gaap:PartnerCapitalComponents
us-gaap:NetIncomeLossAllocatedToLimitedPartners
us-gaap:ConsolidatedEntities
us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax
us-gaap:ConsolidatedEntities, us-gaap:StatementEquityComponents
us-gaap:PartnerTypeOfPartnersCapitalAccount
us-gaap:PartnerTypeOfPartnersCapitalAccount, us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax
us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:OtherCostAndExpenseOperating
us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:OtherOperatingActivitiesCashFlowStatement
us-gaap:PartnerTypeOfPartnersCapitalAccount
us-gaap:StatementBusinessSegments
us-gaap:OtherOperatingIncome
us-gaap:PartnerTypeOfPartnersCapitalAccount
us-gaap:PartnersCapitalAccountContributions
us-gaap:PartnerTypeOfPartnersCapitalAccount, us-gaap:StatementEquityComponents

us-gaap:PaymentsForCapitalImprovements
us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:PaymentsOfDividendsCommonStock
us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:PaymentsOfDividendsMinorityInterest

us-gaap:PaymentsToAcquireEquityMethodInvestments
us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:PreferredStockDividendRatePercentage

us-gaap:PreferredStockDividendsIncomeStatementImpact

us-gaap:ProceedsFromLinesOfCredit
us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:ProceedsFromPaymentsForOtherFinancingActivities
us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:ProceedsFromRepaymentsOfCommercialPaper
us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:ProceedsFromSaleOfRealEstateHeldforinvestment
us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:ProceedsFromStockOptionsExercised

us-gaap:RealEstateTaxesAndInsurance
us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:RepaymentsOfLinesOfCredit
us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:RepaymentsOfNotesPayable
us-gaap:PartnerTypeOfPartnersCapitalAccount
us-gaap:DerivativeInstrumentRisk
us-gaap:StockIssuedDuringPeriodSharesNewIssues
us-gaap:PartnerTypeOfPartnersCapitalAccount, us-gaap:StatementEquityComponents
us-gaap:StockIssuedDuringPeriodValueConversionOfUnits
us-gaap:PartnerTypeOfPartnersCapitalAccount
us-gaap:StockIssuedDuringPeriodValueNewIssues
us-gaap:PartnerTypeOfPartnersCapitalAccount, us-gaap:StatementEquityComponents
us-gaap:PartnerTypeOfPartnersCapitalAccount
us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised
us-gaap:PartnerTypeOfPartnersCapitalAccount, us-gaap:StatementEquityComponents
us-gaap:PartnerTypeOfPartnersCapitalAccount
us-gaap:StockRepurchasedAndRetiredDuringPeriodValue
us-gaap:PartnerTypeOfPartnersCapitalAccount, us-gaap:StatementEquityComponents

us-gaap:WeightedAverageNumberDilutedSharesOutstandingAdjustment
us-gaap:PartnerTypeOfPartnersCapitalAccount
us-gaap:PartnerTypeOfPartnersCapitalAccount
us-gaap:WeightedAverageNumberOfLimitedPartnershipAndGeneralPartnershipUnitOutstandingBasicAndDiluted

maa:BuildingsImprovementsAndOther
us-gaap:PartnerTypeOfPartnersCapitalAccount

maa:CommonSharesAndOperatingPartnershipUnitsOutstanding
us-gaap:StatementEquityComponents
maa:CommonSharesIssuableUponConversionOfConvertibleStock
us-gaap:PartnerTypeOfPartnersCapitalAccount
maa:LiabilitiesAndCapital
us-gaap:DebtInstrument
maa:NotesPayableExcludingInterestRateSwapsAndCapAgreements

maa:OperatingPartnershipUnitsOutstanding

maa:ParentLPStockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
us-gaap:Range
maa:PercentageOfOwnershipInterests

maa:RealEstateAssetsNet
us-gaap:PartnerTypeOfPartnersCapitalAccount
us-gaap:StatementEquityComponents
maa:RedeemableCapitalSharesParOrStatedValuePerShare
us-gaap:PartnerTypeOfPartnersCapitalAccount
maa:StockholdersEquityIncludingNoncontrollingInterest
us-gaap:PartnerTypeOfPartnersCapitalAccount, us-gaap:StatementEquityComponents

maa:UndevelopedLand

us-gaap:AccruedLiabilitiesCurrentAndNoncurrent
us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:AccumulatedDistributionsInExcessOfNetIncome

us-gaap:AdditionalPaidInCapital
us-gaap:InvestmentType
us-gaap:AreaOfRealEstateProperty
us-gaap:PartnerTypeOfPartnersCapitalAccount
us-gaap:Capital

us-gaap:CommonStockValueOutstanding

us-gaap:ConstructionInProgressGross
us-gaap:PartnerTypeOfPartnersCapitalAccount
us-gaap:StatementScenario, us-gaap:InvestmentType
us-gaap:CreditFacility
us-gaap:DebtInstrumentFaceAmount
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:DebtInstrument, us-gaap:LongtermDebtType, maa:DebtInformation
us-gaap:LongtermDebtType, maa:DebtInformation

us-gaap:DebtInstrumentInterestRateEffectivePercentage
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:LongtermDebtType
us-gaap:LongtermDebtType, maa:DebtInformation
us-gaap:FairValueByMeasurementFrequency
us-gaap:EmbeddedDerivativeFairValueOfEmbeddedDerivativeAsset
us-gaap:PartnerTypeOfPartnersCapitalAccount
us-gaap:GeneralPartnersCapitalAccount

us-gaap:GeneralPartnersCapitalAccountUnitsOutstanding
us-gaap:PartnerTypeOfPartnersCapitalAccount
us-gaap:PartnerTypeOfPartnersCapitalAccount
us-gaap:LandAvailableForDevelopment
us-gaap:PartnerTypeOfPartnersCapitalAccount
us-gaap:LimitedPartnersCapitalAccount
us-gaap:StatementEquityComponents

us-gaap:LimitedPartnersCapitalAccountUnitsOutstanding
us-gaap:PartnerTypeOfPartnersCapitalAccount
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:LineOfCredit
us-gaap:LongtermDebtType, maa:DebtInformation

us-gaap:LossContingencyAccrualAtCarryingValue

us-gaap:MinorityInterestInJointVentures
us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:MinorityInterestInOperatingPartnerships
us-gaap:LongtermDebtType, maa:DebtInformation
us-gaap:MortgageLoansOnRealEstate

us-gaap:NotesPayable
us-gaap:LongtermDebtType
us-gaap:DebtInstrument
us-gaap:NotesPayableFairValueDisclosure

us-gaap:NumberOfRealEstateProperties
us-gaap:InvestmentType
us-gaap:InvestmentType, us-gaap:StatementScenario
us-gaap:StatementScenario
us-gaap:StatementScenario, us-gaap:InvestmentType

us-gaap:NumberOfStatesInWhichEntityOperates

us-gaap:OperatingLeaseLiability

us-gaap:OtherAssets
us-gaap:PartnerTypeOfPartnersCapitalAccount
us-gaap:ConsolidatedEntities
us-gaap:PartnersCapital
us-gaap:ConsolidatedEntities, us-gaap:PartnerCapitalComponents
us-gaap:ConsolidatedEntities, us-gaap:StatementEquityComponents
us-gaap:PartnerTypeOfPartnersCapitalAccount
us-gaap:PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest

us-gaap:PreferredStockLiquidationPreference

us-gaap:PreferredStockSharesAuthorized
us-gaap:BusinessAcquisition
us-gaap:PreferredStockSharesOutstanding

us-gaap:PreferredStockValueOutstanding
us-gaap:PartnerTypeOfPartnersCapitalAccount
us-gaap:PreferredUnitsIssued
us-gaap:PartnerTypeOfPartnersCapitalAccount
us-gaap:PreferredUnitsOutstanding
us-gaap:PartnerTypeOfPartnersCapitalAccount
us-gaap:PreferredUnitsPreferredPartnersCapitalAccounts

us-gaap:RealEstateInvestmentPropertyAccumulatedDepreciation
us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:RealEstateInvestmentPropertyAtCost
us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:RealEstateInvestmentPropertyNet
us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:RealEstateInvestmentsJointVentures
us-gaap:BalanceSheetLocation
us-gaap:ProductOrService, us-gaap:RealEstateProperties

us-gaap:RestrictedCash
us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:SecuredDebt
us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest

us-gaap:TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests
us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:TemporaryEquitySharesOutstanding
us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:UnsecuredDebt
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:PartnerTypeOfPartnersCapitalAccount

Tables

  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302014-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-09-302009-06-30
us-gaap:CommonStockSharesIssued ▄▄▄▄114114114114NA113NANANA4242424241414038373736343332299NANANA
us-gaap:CommonStockSharesOutstanding ▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁█114114114114113113113113754242424241414038373736293332299NANANA
us-gaap:CommonStockSharesAuthorized ▄▄▄▄145145145145NA145NANANA1001001001001001005050505050505050000NANANA
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding 114NA114114113NA113113NA424244NA434139NA373837NA3330NA2828
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic 114NA113113113NA113113NA424242NA414039NA373635NA3330NA2828
us-gaap:EarningsPerShareBasic ▁█▄▃▃▃▂▂0.311.29999999999999980.680.530.550.530.460.52NA1.041.380.50.530.740.690.60.490.370.20.250.20.110.040.210.120.25
 us-gaap:EarningsPerShareBasic us-gaap:PartnerTypeOfPartnersCapitalAccount us-gaap:LimitedPartner▁█▄▃▃▃▂▂0.311.30.680.530.550.530.460.52NANANANANANANANANANANANANANANANANANA
us-gaap:EarningsPerShareDiluted ▁█▄▃▃▃▂▂0.311.29999999999999980.680.530.550.530.460.52NA1.041.370.50.530.740.690.60.490.370.20.240.20.110.040.210.120.25
 us-gaap:EarningsPerShareDiluted us-gaap:PartnerTypeOfPartnersCapitalAccount us-gaap:LimitedPartner▁█▄▃▃▃▂▂0.311.30.680.530.550.530.460.52NANANANANANANANANANANANANANANANANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302014-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-09-302009-06-30
 us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:StatementBusinessSegments maa:NonSameStoreAndOther▄▇█▅▄▅▅▁2530312624272620NANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:StatementBusinessSegments maa:SameStore█▇▇▆▆▁▁▁389382381376373344343342NANANANANANANANANANANANANANANANANANA
us-gaap:Revenues ███████▇▄▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁▁▁41841641540740139839739024313613413313112712311911711511010710310198979494
 us-gaap:Revenues us-gaap:PartnerTypeOfPartnersCapitalAccount us-gaap:LimitedPartner██▇▅▄▃▃▁418416415407401398397390NANANANANANANANANANANANANANANANANANA
 us-gaap:Revenues us-gaap:StatementBusinessSegments maa:SameStore█▆▆▄▃▁▁▁392385384380376369369368NANANANANANANANANANANANANANANANANANA
us-gaap:GeneralAndAdministrativeExpense █▆▇▆▇▅▃▅▂▁▁▁13101110129694333NA3334354NA23232
 us-gaap:GeneralAndAdministrativeExpense us-gaap:PartnerTypeOfPartnersCapitalAccount us-gaap:LimitedPartner█▅▆▅█▄▁▄1310111013969NANANANANANANANANANANANANANANANANANA
us-gaap:InterestExpense ▁▁▄██▄▄▁4343444545444443NA1415151514141415151413141313131414
 us-gaap:InterestExpense us-gaap:PartnerTypeOfPartnersCapitalAccount us-gaap:LimitedPartner▁▁▄██▄▄▁4343444545444443NANANANANANANANANANANANANANANANANANA
us-gaap:OtherNonoperatingIncomeExpense ▁▅█▆▅▅▅▆-2802040008NANANANANANANANANANANANANANANANANANA
us-gaap:IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest ▂█▄▄▄▄▃▃▁▁▁▂371558164656354619161722NA16161511978NA66NA69
us-gaap:IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity ▂█▄▄▄▄▂▄▁▁▁▁152222120000NA000NA0NANANANANANANANA
us-gaap:IncomeTaxExpenseBenefit ▁▁█▁▁▁▁▁00100000NANANANANANANANANANANANANANANANANANA
 us-gaap:IncomeTaxExpenseBenefit us-gaap:PartnerTypeOfPartnersCapitalAccount us-gaap:LimitedPartner▁▁█▁▁▁▁▁00100000NANANANANANANANANANANANANANANANANANA
us-gaap:ProfitLoss ▁█▄▃▃▃▂▂37155816465635461NA466122233229251914797669610
 us-gaap:ProfitLoss us-gaap:PartnerTypeOfPartnersCapitalAccount us-gaap:LimitedPartner▁█▄▃▃▃▂▂37155816465635461NANANANANANANANANANANANANANANANANANA
us-gaap:ComprehensiveIncomeNetOfTax ▁█▃▂▂▂▂▃36151725660495664NA467425NA3129272314616NA2NANANANA
 us-gaap:ComprehensiveIncomeNetOfTax us-gaap:PartnerTypeOfPartnersCapitalAccount us-gaap:LimitedPartner▁█▃▂▂▂▂▃38156755862515867NANANANANANANANANANANANANANANANANANA
us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest ▁█▃▃▃▁▃▃15222122NA121NA211NA000NANANANANANA
us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest ▁█▃▂▂▂▂▃38156755862515867NA477726NA333029NA15716NANANANANANA
us-gaap:NetIncomeLoss ▂█▅▄▄▄▃▄▁▃▄▂▂▂▂▂▂▁▁▁▁▁▁▁▁▁3614978616361525914445921223028231813786669610
 us-gaap:NetIncomeLoss us-gaap:PartnerTypeOfPartnersCapitalAccount us-gaap:LimitedPartner37NA80NA65NA53NANANANANANANANANANANANANANANANANANANA
us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic ▁█▄▃▃▃▂▂35148776062605158NA44592122302823181378631636
us-gaap:NetIncomeLossAttributableToNoncontrollingInterest ▂█▄▄▄▄▂▄▁▂▂▁▁▂▂▂▂▁▁▁▁▁▁▁▁▁15222212011001111000000000
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302014-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-09-302009-06-30
us-gaap:Assets ▁▅▆█11155112301124711274NA11323NANA678530282834277527512775259925272530241223132201217621891998NANANA
 us-gaap:Assets us-gaap:PartnerTypeOfPartnersCapitalAccount us-gaap:LimitedPartner▁▃▃▄▅▅▇█1115511230112471127411303113231141811447NANANANANANANANANANANANANANANANANANA
 us-gaap:Assets us-gaap:StatementBusinessSegments maa:SameStore█▁▃▇9893966197299849NA9991NANANANANANANANANANANANANANANANANANANANA
us-gaap:Liabilities ▁▁█▇4929492649974990NA4942NANANA19931816180718011845172816591782172916691574163117011497NANANA
 us-gaap:Liabilities us-gaap:PartnerTypeOfPartnersCapitalAccount us-gaap:LimitedPartner▁▁█▇▅▃▆▄49294926499749904967494249774958NANANANANANANANANANANANANANANANANANA
us-gaap:LiabilitiesAndStockholdersEquity ▁▅▆█11155112301124711274NA11323NANANA30282834277527512775259925272530241223132201217621891998NANANA
us-gaap:StockholdersEquity ▁█▃▆5997606860166051NA6149NANANA990980932914894839834718654617600518465475NANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302014-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-09-302009-06-30
us-gaap:CashAndCashEquivalentsAtCarryingValue ▅▁▂▆▇▅█▄3420254044344632NA18188913224157241247451002532166
 us-gaap:CashAndCashEquivalentsAtCarryingValue us-gaap:PartnerTypeOfPartnersCapitalAccount us-gaap:LimitedPartner▅▁▂▆▇▅█▄3420254044344632NANANANANANANANANANANANANANANANANANA
us-gaap:Land █▇▅▁1910190518981883NA1868NANANA394396389386388358337333320312291288270258NANANA
 us-gaap:Land us-gaap:PartnerTypeOfPartnersCapitalAccount us-gaap:LimitedPartner█▇▆▄▃▁▁▁19101905189818831878186818681868NANANANANANANANANANANANANANANANANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302014-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-09-302009-06-30
us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures ▄▄▄▄43434343NA44NANANA3304561617171718171512NANANA
 us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures us-gaap:PartnerTypeOfPartnersCapitalAccount us-gaap:LimitedPartner▁▁▁▁████4343434344444444NANANANANANANANANANANANANANANANANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302014-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-09-302009-06-30
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302014-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-09-302009-06-30
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302014-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-09-302009-06-30
us-gaap:StockholdersEquity ▁█▃▆5997606860166051NA6149NANANA990980932914894839834718654617600518465475NANANA
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax ▄▂▁█-12-13-14-9NA0NANA2-4-6-21-26-30-30-31-35-41-42-41-48-60-56NANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302014-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-09-302009-06-30
us-gaap:NetCashProvidedByUsedInOperatingActivities ▃▃█▆▂▁▇160159253213154133237NANANANA42NANANA374345NA31NANANA25NANA
 us-gaap:NetCashProvidedByUsedInOperatingActivities us-gaap:PartnerTypeOfPartnersCapitalAccount us-gaap:LimitedPartner▃▃█▆▂▁▇▆160159253213154133237211NANANANANANANANANANANANANANANANANANA
us-gaap:NetCashProvidedByUsedInInvestingActivities ▁█▁▁▄▂▃-89-7-89-87-52-78-66NANANANA-51NANANA-34-120-94NA-47NANANA31NANA
us-gaap:NetCashProvidedByUsedInFinancingActivities ▇▅▁▅▇█▃-92-124-178-127-94-82-152NANANANA8NANANA-1911060NA17NANANA-38NANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302014-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-09-302009-06-30
us-gaap:NetCashProvidedByUsedInOperatingActivities ▃▃█▆▂▁▇160159253213154133237NANANANA42NANANA374345NA31NANANA25NANA
 us-gaap:NetCashProvidedByUsedInOperatingActivities us-gaap:PartnerTypeOfPartnersCapitalAccount us-gaap:LimitedPartner▃▃█▆▂▁▇▆160159253213154133237211NANANANANANANANANANANANANANANANANANA
us-gaap:NetIncomeLoss ▂█▅▄▄▄▃▄▁▃▄▂▂▂▂▂▂▁▁▁▁▁▁▁▁▁3614978616361525914445921223028231813786669610
 us-gaap:NetIncomeLoss us-gaap:PartnerTypeOfPartnersCapitalAccount us-gaap:LimitedPartner37NA80NA65NA53NANANANANANANANANANANANANANANANANANANA
us-gaap:ProfitLoss ▁█▄▃▃▃▂▂37155816465635461NA466122233229251914797669610
 us-gaap:ProfitLoss us-gaap:PartnerTypeOfPartnersCapitalAccount us-gaap:LimitedPartner▁█▄▃▃▃▂▂37155816465635461NANANANANANANANANANANANANANANANANANA
us-gaap:DepreciationDepletionAndAmortization █▇▅▅▄▁▅126125124124123121124NANANANA34NANANA313130NA28NANANA25NANA
 us-gaap:DepreciationDepletionAndAmortization us-gaap:PartnerTypeOfPartnersCapitalAccount us-gaap:LimitedPartner█▇▅▅▄▁▅▄126125124124123121124123NANANANANANANANANANANANANANANANANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302014-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-09-302009-06-30
us-gaap:NetCashProvidedByUsedInInvestingActivities ▁█▁▁▄▂▃-89-7-89-87-52-78-66NANANANA-51NANANA-34-120-94NA-47NANANA31NANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302014-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-09-302009-06-30
us-gaap:NetCashProvidedByUsedInFinancingActivities ▇▅▁▅▇█▃-92-124-178-127-94-82-152NANANANA8NANANA-1911060NA17NANANA-38NANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302014-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-09-302009-06-30

Common Stock Par Or Stated Value Per Share

Shares Outstanding

Shares Issued

Common Stock Shares Issued

us-gaap:CommonStockSharesIssued



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value114114114114113424242424141403837373634333229929095
Percentage of CommonStockSharesIssued100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Common Stock Shares Outstanding

us-gaap:CommonStockSharesOutstanding



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value114114114114113113113113113113113113113113757575757575757575757574424242424141403837373629333229929095
Percentage of CommonStockSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Common Stock Shares Authorized

us-gaap:CommonStockSharesAuthorized



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value145145145145145100100100100100100505050505050505000050000
Percentage of CommonStockSharesAuthorized100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Diluted Shares Outstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302009-09-302009-06-30
Value11411411411311311342424443413937383733302828
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-31
Value000118118117117117117117797975
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding0.10.10.1103.6103.6103.60.00.00.00.00.00.00.0

Weighted Average Number Of Shares Outstanding Basic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302009-09-302009-06-30
Value11411311311311311342424241403937363533302828
Percentage of WeightedAverageNumberOfSharesOutstandingBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Basic

us-gaap:EarningsPerShareBasic



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-09-302009-06-30
Value0.311.29999999999999980.680.530.550.530.460.521.041.380.50.530.740.690.60.490.370.20.250.20.110.040.210.120.25
Percentage of EarningsPerShareBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value0.311.30.680.530.550.530.460.520.421.081.00.420.360.451.120.60.610.571.221.810.81
Percentage of EarningsPerShareBasic100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Earnings Per Share Diluted

us-gaap:EarningsPerShareDiluted



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-09-302009-06-30
Value0.311.29999999999999980.680.530.550.530.460.521.041.370.50.530.740.690.60.490.370.20.240.20.110.040.210.120.25
Percentage of EarningsPerShareDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value0.311.30.680.530.550.530.460.520.421.081.00.420.360.451.120.60.610.571.221.810.81
Percentage of EarningsPerShareDiluted100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Income Loss From Continuing Operations Per Basic Share

Income Loss From Continuing Operations Per Diluted Share

Revenue From Contract With Customer Including Assessed Tax

us-gaap:StatementBusinessSegments

us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax

maa:NonSameStoreAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value2530312624272620
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues6.10.07.56.56.10.06.65.2
Percentage of Revenues maa:NonSameStoreAndOther99.90.099.699.399.30.095.295.6

maa:SameStore



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value389382381376373344343342
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1516.41237.71222.21417.11525.91252.91309.71680.3
Percentage of Revenues93.20.091.792.593.10.086.587.9
Percentage of Revenues maa:SameStore99.30.099.299.099.20.092.993.0

Revenues

us-gaap:Revenues



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302014-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-09-302009-06-30
Value41841641540740139839739024313613413313112712311911711511010710310198979494
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value418416415407401398397390386382384382378307276272269263261258258
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Revenues us-gaap:LimitedPartner100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementBusinessSegments

maa:NonSameStoreAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value2531312624282721
Percentage of Revenues6.27.67.56.66.17.16.95.5
Percentage of Revenues6.27.67.56.66.17.16.95.5
Percentage of Revenues maa:NonSameStoreAndOther100.0100.0100.0100.0100.0100.0100.0100.0

maa:SameStore



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value392385384380376369369368
Percentage of Revenues93.892.492.593.493.992.993.194.5
Percentage of Revenues93.892.492.593.493.992.993.194.5
Percentage of Revenues maa:SameStore100.0100.0100.0100.0100.0100.0100.0100.0

Operating Expenses

Operating Costs And Expenses

General And Administrative Expense

us-gaap:GeneralAndAdministrativeExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-312009-09-302009-06-30
Value13101110129694333333435423232
Percentage of GeneralAndAdministrativeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues3.22.62.82.63.12.31.62.41.82.92.52.42.82.82.93.53.44.94.32.93.12.93.32.8

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value131011101396910989128676
Percentage of GeneralAndAdministrativeExpense100.0100.0100.0100.0106.6100.0100.0100.00.00.00.00.00.00.00.00.00.0
Percentage of Revenues3.22.62.82.63.32.31.62.40.00.00.00.00.00.00.00.00.0
Percentage of Revenues us-gaap:LimitedPartner3.22.62.82.63.32.31.62.42.62.52.22.53.42.92.42.62.4

Operating Income Loss

Interest Expense

us-gaap:InterestExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-09-302009-06-30
Value43434445454444431415151514141415151413141313131414
Percentage of InterestExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues10.410.510.711.311.411.211.211.211.011.411.812.011.611.512.012.813.412.813.014.013.414.114.315.115.3

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value434344454544444340393938363332323230303030
Percentage of InterestExpense100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Revenues10.410.510.711.311.411.211.211.20.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Revenues us-gaap:LimitedPartner10.410.510.711.311.411.211.211.210.610.410.410.19.710.911.611.812.011.711.511.811.9

Other Nonoperating Income Expense

us-gaap:OtherNonoperatingIncomeExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value-2802040008
Percentage of OtherNonoperatingIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues-6.8-0.14.81.20.0-0.20.12.1

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value-2802040008-23522
Percentage of OtherNonoperatingIncomeExpense100.0100.0100.0100.0785.7100.0100.0100.00.00.00.00.00.0
Percentage of Revenues-6.8-0.14.81.20.2-0.20.12.10.00.00.00.00.0
Percentage of Revenues us-gaap:LimitedPartner-6.8-0.14.81.20.2-0.20.12.1-0.60.91.50.70.7

Income Loss From Continuing Operations

Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest

us-gaap:IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-09-302010-06-302009-09-302009-06-30
Value371558164656354619161722161615119786669
Percentage of IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues9.137.219.615.716.416.013.815.94.012.212.716.512.913.313.29.78.26.98.16.97.06.99.8

Income Loss From Continuing Operations Attributable To Noncontrolling Entity

us-gaap:IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-30
Value1522221200000000
Percentage of IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues0.31.30.70.50.60.60.50.6-0.20.50.50.60.40.50.60.3

Nonoperating Income Expense

Income Tax Expense Benefit

us-gaap:IncomeTaxExpenseBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value00100000
Percentage of IncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues0.20.20.40.20.20.20.20.1

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value00100000
Percentage of IncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues0.20.20.40.20.20.20.20.1
Percentage of Revenues us-gaap:LimitedPartner0.20.20.40.20.20.20.20.1

Profit Loss

us-gaap:ProfitLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-09-302009-06-30
Value37155816465635461466122233229251914797669610
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues9.137.219.615.716.416.013.815.933.845.516.517.725.223.821.017.012.57.08.56.96.97.010.17.211.3

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value3715581646563546150128118504342884745459614364
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Revenues9.137.219.615.716.416.013.815.90.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Revenues us-gaap:LimitedPartner9.137.219.615.716.416.013.815.913.233.430.913.111.513.732.117.517.017.237.055.625.0

Comprehensive Income Net Of Tax

us-gaap:ComprehensiveIncomeNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-09-30
Value3615172566049566446742531292723146162
Percentage of ComprehensiveIncomeNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues8.836.317.513.815.112.414.216.633.755.619.024.623.523.419.612.56.215.02.7

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value38156755862515867
Percentage of ComprehensiveIncomeNetOfTax103.6103.6103.6103.6103.6103.7103.6103.6
Percentage of Revenues9.137.618.214.315.612.914.717.2
Percentage of Revenues us-gaap:LimitedPartner9.137.618.214.315.612.914.717.2

Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-31
Value15222122121211000
Percentage of ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues0.31.30.60.50.50.50.50.61.31.80.82.11.11.20.60.20.5

Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-31
Value3815675586251586747772633302915716
Percentage of ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues9.137.618.214.315.612.914.717.235.157.519.826.724.624.513.16.415.5

Net Income Loss

us-gaap:NetIncomeLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302014-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-09-302009-06-30
Value3614978616361525914445921223028231813786669610
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues8.835.918.915.215.915.413.315.36.132.544.115.917.024.322.720.016.011.96.78.26.76.76.79.77.010.7

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-09-302019-03-312018-09-30
Value37806553
Percentage of NetIncomeLoss101.0102.4102.2101.9
Percentage of Revenues8.919.416.213.5
Percentage of Revenues us-gaap:LimitedPartner8.919.416.213.5

Net Income Loss Available To Common Stockholders Basic

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-09-302009-06-30
Value3514877606260515844592122302823181378631636
Percentage of NetIncomeLossAvailableToCommonStockholdersBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues8.535.718.715.015.615.213.115.132.544.115.917.024.322.720.016.011.96.78.26.73.51.46.43.67.3

Net Income Loss Available To Common Stockholders Diluted

Net Income Loss Attributable To Noncontrolling Interest

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302014-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-09-302009-06-30
Value15222212011001111000000000
Percentage of NetIncomeLossAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues0.31.30.70.50.60.60.50.60.31.31.40.60.71.01.11.01.00.60.20.30.20.20.20.40.30.6

Assets

us-gaap:Assets



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value111551123011247112741132367856841302828342775275127752599252725302412231322012176218919981986
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities, us-gaap:ProductOrService

us-gaap:VariableInterestEntityPrimaryBeneficiary, us-gaap:RealEstate



Period End2020-03-312019-12-312018-12-31
Value534685
Percentage of Assets0.50.40.8
Percentage of Assets0.50.40.8
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary us-gaap:RealEstate100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value11155112301124711274113031132311418114471141711491115321153411559116046847
Percentage of Assets100.0100.0100.0100.00.0100.00.00.00.00.00.00.00.00.00.0
Percentage of Assets100.0100.0100.0100.00.0100.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:LimitedPartner100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementBusinessSegments

maa:NonSameStoreAndOther



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value1107136213451233116345644638674692643949952755639760659560359
Percentage of Assets9.912.112.010.910.367.367.822.324.423.234.534.329.125.330.027.324.216.5
Percentage of Assets9.912.112.010.910.367.367.822.324.423.234.534.329.125.330.027.324.216.5
Percentage of Assets maa:NonSameStoreAndOther100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

maa:SameStore



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value98939661972998499991
Percentage of Assets88.786.086.587.488.2
Percentage of Assets88.786.086.587.488.2
Percentage of Assets maa:SameStore100.0100.0100.0100.0100.0

us-gaap:Corporate



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value154205172191169194153282603938
Percentage of Assets1.41.81.51.71.52.92.29.32.11.41.4
Percentage of Assets1.41.81.51.71.52.92.29.32.11.41.4
Percentage of Assets us-gaap:Corporate100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Liabilities

us-gaap:Liabilities



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value49294926499749904942199318161807180118451728165917821729166915741631170114971530
Percentage of Liabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets44.243.944.444.343.665.864.165.165.566.566.565.770.571.772.171.575.077.774.977.0

us-gaap:ConsolidatedEntities, us-gaap:ProductOrService

us-gaap:VariableInterestEntityPrimaryBeneficiary, us-gaap:RealEstate



Period End2020-03-312019-12-312018-12-31
Value431
Percentage of Liabilities0.10.10.0
Percentage of Assets0.00.00.0
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary us-gaap:RealEstate9.27.01.5

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value492949264997499049674942497749584889490749714991496349523681
Percentage of Liabilities100.0100.0100.0100.00.0100.00.00.00.00.00.00.00.00.00.0
Percentage of Assets44.243.944.444.30.043.60.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:LimitedPartner44.243.944.444.343.943.643.643.342.842.743.143.342.942.753.8

Liabilities And Stockholders Equity

us-gaap:LiabilitiesAndStockholdersEquity



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value1115511230112471127411323302828342775275127752599252725302412231322012176218919981986
Percentage of LiabilitiesAndStockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Stockholders Equity

us-gaap:StockholdersEquity



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value59976068601660516149990980932914894839834718654617600518465475430
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets53.854.053.553.754.332.734.633.633.232.232.333.028.427.126.727.323.821.323.821.7

Cash And Cash Equivalents At Carrying Value

us-gaap:CashAndCashEquivalentsAtCarryingValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302008-12-312007-12-31
Value3420254044344632101818891322415724124745100253213166917
Percentage of CashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.30.20.20.40.00.30.00.00.06.00.30.30.30.50.91.72.31.00.62.12.14.61.30.00.70.00.00.00.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-312013-12-31
Value3420254044344632591047393333272628372689
Percentage of CashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.00.0100.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets0.30.20.20.40.00.30.00.00.00.00.00.00.00.00.00.00.00.00.01.3
Percentage of Assets us-gaap:LimitedPartner0.30.20.20.40.40.30.40.30.50.10.40.30.30.30.00.00.00.50.00.0

Land

us-gaap:Land



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value19101905189818831868394396389386388358337333320312291288270258255
Percentage of Land100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets17.117.016.916.716.513.014.014.014.114.013.813.313.213.313.513.213.312.412.912.9

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value19101905189818831878186818681868183618361828182118251816926
Percentage of Land100.0100.0100.0100.00.0100.00.00.00.00.00.00.00.00.00.0
Percentage of Assets17.117.016.916.70.016.50.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:LimitedPartner17.117.016.916.716.616.516.416.316.116.015.915.815.815.613.5

Investments In Affiliates Subsidiaries Associates And Joint Ventures

us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value434343434433045616171717181715128
Percentage of InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.40.40.40.40.40.10.10.00.20.20.20.70.70.70.80.80.80.70.60.4

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value43434343444444444544454444441
Percentage of InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures100.0100.0100.0100.00.0100.00.00.00.00.00.00.00.00.00.0
Percentage of Assets0.40.40.40.40.00.40.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:LimitedPartner0.40.40.40.40.40.40.40.40.40.40.40.40.40.40.0

Goodwill

Long Term Debt

Minority Interest

Stockholders Equity

us-gaap:StockholdersEquity



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value59976068601660516149990980932914894839834718654617600518465475430
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets53.854.053.553.754.332.734.633.633.232.232.333.028.427.126.727.323.821.323.821.7

Accumulated Other Comprehensive Income Loss Net Of Tax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value-12-13-14-9020-4-6-21-26-30-30-31-35-41-42-41-48-60-56-47
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets-0.1-0.1-0.1-0.1-0.00.00.0-0.2-0.2-0.8-0.9-1.1-1.2-1.3-1.4-1.7-1.8-1.9-2.2-2.8-2.8-2.4

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value-13-13-15-9-30128320041-1
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax103.1103.1103.2103.00.075.90.00.00.00.00.00.00.00.00.0
Percentage of Assets-0.1-0.1-0.1-0.10.0-0.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:LimitedPartner-0.1-0.1-0.1-0.1-0.0-0.00.10.10.00.00.00.00.00.0-0.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302013-03-312012-03-312011-12-312011-09-302011-03-312010-03-31
Value160159253213154133237423743453125
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues38.438.460.952.538.633.559.731.631.636.639.429.225.8

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value16015925321315413323721115210523118313894151134104
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.00.00.00.00.0
Percentage of Revenues38.438.460.952.538.633.559.754.20.00.00.00.00.00.00.00.00.0
Percentage of Revenues us-gaap:LimitedPartner38.438.460.952.538.633.559.754.239.627.560.248.036.430.954.549.338.7

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302013-03-312012-03-312011-12-312011-09-302011-03-312010-03-31
Value-89-7-89-87-52-78-66-51-34-120-94-4731
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues-21.5-1.8-21.6-21.6-13.2-19.7-16.7-38.4-28.5-102.9-81.7-44.132.3

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value-89-7-89-87-52-78-66-174-46-51-42-98-90-494-30-119-65
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.00.00.00.00.0
Percentage of Revenues-21.5-1.8-21.6-21.6-13.2-19.7-16.7-44.80.00.00.00.00.00.00.00.00.0
Percentage of Revenues us-gaap:LimitedPartner-21.5-1.8-21.6-21.6-13.2-19.7-16.7-44.8-12.1-13.4-11.2-25.8-23.9-160.9-11.1-43.9-24.5

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302013-03-312012-03-312011-12-312011-09-302011-03-312010-03-31
Value-92-124-178-127-94-82-1528-191106017-38
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues-22.0-29.9-42.9-31.3-23.5-20.7-38.36.2-16.194.452.116.1-39.1

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value-92-124-178-127-94-82-152-57-112-91-180-79-46405-118-16-47
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.00.00.00.00.0
Percentage of Revenues-22.0-29.9-42.9-31.3-23.5-20.7-38.3-14.80.00.00.00.00.00.00.00.00.0
Percentage of Revenues us-gaap:LimitedPartner-22.0-29.9-42.9-31.3-23.5-20.7-38.3-14.8-29.2-23.9-46.9-20.7-12.4131.9-42.9-6.1-17.7

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302013-03-312012-03-312011-12-312011-09-302011-03-312010-03-31
Value160159253213154133237423743453125
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues38.438.460.952.538.633.559.731.631.636.639.429.225.8

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value16015925321315413323721115210523118313894151134104
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.00.00.00.00.0
Percentage of Revenues38.438.460.952.538.633.559.754.20.00.00.00.00.00.00.00.00.0
Percentage of Revenues us-gaap:LimitedPartner38.438.460.952.538.633.559.754.239.627.560.248.036.430.954.549.338.7

Net Income Loss

us-gaap:NetIncomeLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302014-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-09-302009-06-30
Value3614978616361525914445921223028231813786669610
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues8.835.918.915.215.915.413.315.36.132.544.115.917.024.322.720.016.011.96.78.26.76.76.79.77.010.7

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-09-302019-03-312018-09-30
Value37806553
Percentage of NetIncomeLoss101.0102.4102.2101.9
Percentage of Revenues8.919.416.213.5
Percentage of Revenues us-gaap:LimitedPartner8.919.416.213.5

Profit Loss

us-gaap:ProfitLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-09-302009-06-30
Value37155816465635461466122233229251914797669610
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues9.137.219.615.716.416.013.815.933.845.516.517.725.223.821.017.012.57.08.56.96.97.010.17.211.3

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value3715581646563546150128118504342884745459614364
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Revenues9.137.219.615.716.416.013.815.90.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Revenues us-gaap:LimitedPartner9.137.219.615.716.416.013.815.913.233.430.913.111.513.732.117.517.017.237.055.625.0

Depreciation Depletion And Amortization

us-gaap:DepreciationDepletionAndAmortization



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302013-03-312012-03-312011-12-312011-09-302011-03-312010-03-31
Value126125124124123121124343131302825
Percentage of DepreciationDepletionAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value12612512412412312112412312111911812613095767575
Percentage of DepreciationDepletionAndAmortization100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302013-03-312012-03-312011-12-312011-09-302011-03-312010-03-31
Value-89-7-89-87-52-78-66-51-34-120-94-4731
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues-21.5-1.8-21.6-21.6-13.2-19.7-16.7-38.4-28.5-102.9-81.7-44.132.3

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value-89-7-89-87-52-78-66-174-46-51-42-98-90-494-30-119-65
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.00.00.00.00.0
Percentage of Revenues-21.5-1.8-21.6-21.6-13.2-19.7-16.7-44.80.00.00.00.00.00.00.00.00.0
Percentage of Revenues us-gaap:LimitedPartner-21.5-1.8-21.6-21.6-13.2-19.7-16.7-44.8-12.1-13.4-11.2-25.8-23.9-160.9-11.1-43.9-24.5

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302013-03-312012-03-312011-12-312011-09-302011-03-312010-03-31
Value-92-124-178-127-94-82-1528-191106017-38
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues-22.0-29.9-42.9-31.3-23.5-20.7-38.36.2-16.194.452.116.1-39.1

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value-92-124-178-127-94-82-152-57-112-91-180-79-46405-118-16-47
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.00.00.00.00.0
Percentage of Revenues-22.0-29.9-42.9-31.3-23.5-20.7-38.3-14.80.00.00.00.00.00.00.00.00.0
Percentage of Revenues us-gaap:LimitedPartner-22.0-29.9-42.9-31.3-23.5-20.7-38.3-14.8-29.2-23.9-46.9-20.7-12.4131.9-42.9-6.1-17.7

Payments For Repurchase Of Common Stock

Debt Instrument Interest Rate Stated Percentage

Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number

us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber

us-gaap:EmployeeStockOption



Period End2020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value19845.045390.060442.087788.090615.090615.095838.095838.0108438.0108438.0108438.0147282.0147282.039084.039084.058112.058112.058112.058112.074454.074454.081654.0121992.0296583.0356143.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price

Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period

Share Based Compensation

us-gaap:ShareBasedCompensation



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302013-03-312012-03-312011-12-312011-03-312010-12-31
Value523342200101
Percentage of ShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value525-1934222422235221
Percentage of ShareBasedCompensation100.01197.9-597.3100.0100.0100.0100.00.00.00.00.00.00.00.00.00.00.0

Deferred Tax Liabilities

Deferred Tax Assets Net

Deferred Tax Assets Valuation Allowance

Operating Lease Right Of Use Asset

us-gaap:OperatingLeaseRightOfUseAsset



Period End2020-03-312019-12-312019-09-302019-06-30
Value53545353
Percentage of OperatingLeaseRightOfUseAsset100.0100.0100.0100.0

Cash And Cash Equivalents Period Increase Decrease

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312016-12-31
Value497042575951796088121
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
Value497042575951796082881286758121
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.00.0100.00.00.00.0100.0

maa:AdjustedIncomeLossFromContinuingOperationsAvailableForCommonShareholdersBasic



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value35148776062605158
Percentage of AdjustedIncomeLossFromContinuingOperationsAvailableForCommonShareholdersBasic100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-03-31
Value3664
Percentage of AdjustedIncomeLossFromContinuingOperationsAvailableForCommonShareholdersBasic103.7103.7

maa:AdjustedIncomeLossFromContinuingOperationsAvailableForCommonShareholdersDiluted



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value35148776062605158
Percentage of AdjustedIncomeLossFromContinuingOperationsAvailableForCommonShareholdersDiluted100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-03-31
Value3765
Percentage of AdjustedIncomeLossFromContinuingOperationsAvailableForCommonShareholdersDiluted103.7103.7

us-gaap:ConsolidatedEntities, us-gaap:PartnerCapitalComponents

maa:AdjustmentForLimitedPartnersCapitalAtRedemptionValue

maa:MAALP, maa:GeneralPartnersCapitalAccount



Period End2020-03-312019-09-302019-03-312018-09-30
Value-56000.0-77000.053000.0139000.0
Percentage of AdjustmentForLimitedPartnersCapitalAtRedemptionValue100.0100.0100.0100.0

maa:MAALP, us-gaap:LimitedPartner



Period End2020-03-312019-09-302019-03-312018-09-30
Value56000.077000.0-53000.0-139000.0
Percentage of AdjustmentForLimitedPartnersCapitalAtRedemptionValue-100.0-100.0-100.0-100.0

us-gaap:ConsolidatedEntities

maa:AmortizationUnearnedCompensation

maa:MAALP



Period End2020-03-312019-09-302019-03-312018-09-30
Value5342
Percentage of AmortizationUnearnedCompensation100.0100.0100.0100.0

us-gaap:ConsolidatedEntities, us-gaap:PartnerCapitalComponents

maa:MAALP, maa:GeneralPartnersCapitalAccount



Period End2020-03-312019-09-302019-03-312018-09-30
Value5342
Percentage of AmortizationUnearnedCompensation100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

maa:MidAmericaApartmentCommunitiesIncShareholdersEquity



Period End2020-03-312019-09-302019-03-312018-09-30
Value5342
Percentage of AmortizationUnearnedCompensation100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount, us-gaap:StatementEquityComponents

maa:MidAmericaApartmentCommunitiesIncShareholdersEquity, us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-09-302019-03-312018-09-30
Value5342
Percentage of AmortizationUnearnedCompensation100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

maa:BasicEarningsPerUnit

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value0.311.29999999999999980.680.530.550.530.460.520.421.07999999999999981.00.42
Percentage of BasicEarningsPerUnit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

maa:DilutedEarningsPerUnit

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value0.311.29999999999999980.680.530.550.530.460.520.421.07999999999999981.00.42
Percentage of DilutedEarningsPerUnit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

maa:Distributions

maa:MAALP



Period End2020-03-312019-09-302019-03-312018-09-30
Value118113113108
Percentage of Distributions100.0100.0100.0100.0

us-gaap:ConsolidatedEntities, us-gaap:PartnerCapitalComponents

maa:MAALP, maa:GeneralPartnersCapitalAccount



Period End2020-03-312019-09-302019-03-312018-09-30
Value114109109105
Percentage of Distributions96.696.696.596.7

maa:MAALP, us-gaap:LimitedPartner



Period End2020-03-312019-09-302019-03-312018-09-30
Value4333
Percentage of Distributions3.43.43.53.3

us-gaap:ConsolidatedEntities

maa:EffectOnRetainedEarningsAccumulatedDeficitDueToFairValueOptionAndMeasurement

maa:MAALP



Period End2020-03-312019-09-302019-03-312018-09-30
Value3-1-10
Percentage of EffectOnRetainedEarningsAccumulatedDeficitDueToFairValueOptionAndMeasurement100.0100.0100.0100.0

us-gaap:ConsolidatedEntities, us-gaap:PartnerCapitalComponents

maa:MAALP, maa:GeneralPartnersCapitalAccount



Period End2020-03-312019-09-302019-03-312018-09-30
Value3-1-10
Percentage of EffectOnRetainedEarningsAccumulatedDeficitDueToFairValueOptionAndMeasurement100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

maa:MidAmericaApartmentCommunitiesIncShareholdersEquity



Period End2020-03-312019-09-302019-03-312018-09-30
Value3-1-10
Percentage of EffectOnRetainedEarningsAccumulatedDeficitDueToFairValueOptionAndMeasurement100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount, us-gaap:StatementEquityComponents

maa:MidAmericaApartmentCommunitiesIncShareholdersEquity, us-gaap:AccumulatedDistributionsInExcessOfNetIncome



Period End2020-03-312019-09-302019-03-312018-09-30
Value3-1-10
Percentage of EffectOnRetainedEarningsAccumulatedDeficitDueToFairValueOptionAndMeasurement100.0100.0100.0100.0

maa:GainLossOnSaleOfNonDepreciableRealEstateAssets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value02008002
Percentage of GainLossOnSaleOfNonDepreciableRealEstateAssets100.0100.00.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value02008002
Percentage of GainLossOnSaleOfNonDepreciableRealEstateAssets100.0100.00.0100.0100.0100.0100.0100.0

maa:GainOnSaleOfNonDepreciableAssets



Period End2020-03-312019-09-302019-06-302019-03-312018-09-30
Value00080
Percentage of GainOnSaleOfNonDepreciableAssets100.00.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-09-302019-06-302019-03-312018-09-30
Value00080
Percentage of GainOnSaleOfNonDepreciableAssets100.00.0100.0100.0100.0

us-gaap:ConsolidatedEntities, us-gaap:PartnerCapitalComponents

maa:GeneralPartnershipUnitsIssuedInExchangeForLimitedPartnershipUnits

maa:MAALP, maa:GeneralPartnersCapitalAccount



Period End2020-03-312019-09-302019-03-312018-09-30
Value0001
Percentage of GeneralPartnershipUnitsIssuedInExchangeForLimitedPartnershipUnits100.0100.0100.0100.0

maa:MAALP, us-gaap:LimitedPartner



Period End2020-03-312019-09-302019-03-312018-09-30
Value000-1
Percentage of GeneralPartnershipUnitsIssuedInExchangeForLimitedPartnershipUnits-100.0-100.0-100.0-100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

maa:IncomeFromContinuingOperationsAllocatedToUnvestedRestrictedShares

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value-50000.0-217000.0-118000.0-96000.0-87000.0-80000.0-69000.0-78000.0
Percentage of IncomeFromContinuingOperationsAllocatedToUnvestedRestrictedShares100.0100.0100.0100.0100.0100.0100.0100.0

maa:IncomeLossFromContinuingOperationsAllocatedToUnvestedRestrictedShares



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value50000.0118000.096000.087000.069000.078000.0
Percentage of IncomeLossFromContinuingOperationsAllocatedToUnvestedRestrictedShares100.0100.0100.0100.0100.0100.0

maa:IncomeLossFromContinuingOperationsBeforeEquityMethodInvestments



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value378163655461
Percentage of IncomeLossFromContinuingOperationsBeforeEquityMethodInvestments100.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value378163655461
Percentage of IncomeLossFromContinuingOperationsBeforeEquityMethodInvestments100.0100.0100.0100.0100.0100.0

maa:IncomefromContinuingOperationsAttributabletoNoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value-1-2022-2-1412
Percentage of IncomefromContinuingOperationsAttributabletoNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0

maa:IncomefromContinuingOperationsIncludingPortionAttributabletoNoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value37155816465635461
Percentage of IncomefromContinuingOperationsIncludingPortionAttributabletoNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount, us-gaap:StatementEquityComponents

maa:NetIncomeAttributabletoNoncontrollingInterest

maa:MidAmericaApartmentCommunitiesIncShareholdersEquity, maa:NoncontrollingInterestOperatingPartnership



Period End2020-03-312019-09-302019-03-312018-09-30
Value1221
Percentage of NetIncomeAttributabletoNoncontrollingInterest100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount, us-gaap:StatementEquityComponents

maa:NetIncomeAttributabletoParent

maa:MidAmericaApartmentCommunitiesIncShareholdersEquity, us-gaap:AccumulatedDistributionsInExcessOfNetIncome



Period End2020-03-312019-09-302019-03-312018-09-30
Value36786352
Percentage of NetIncomeAttributabletoParent100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

maa:NetIncomeAvailableForCommonUnitholders

maa:MAALP



Period End2020-03-312019-09-302019-03-312018-09-30
Value37816554
Percentage of NetIncomeAvailableForCommonUnitholders100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

maa:NetIncomeIncludingPortionAttributabletoNoncontrollingInterest

maa:MidAmericaApartmentCommunitiesIncShareholdersEquity



Period End2020-03-312019-09-302019-03-312018-09-30
Value37816554
Percentage of NetIncomeIncludingPortionAttributabletoNoncontrollingInterest100.0100.0100.0100.0

maa:OperatingCostsAndExpensesExcludingDepreciationAndAmortization



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value91911009689919792
Percentage of OperatingCostsAndExpensesExcludingDepreciationAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value91911009689919792
Percentage of OperatingCostsAndExpensesExcludingDepreciationAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0

maa:OperatingIncomeBeforeDepreciation



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value26426725625325125124224114780818074736968646261585656
Percentage of OperatingIncomeBeforeDepreciation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementBusinessSegments

maa:NonSameStoreAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value1519171513151410741212111312911974432
Percentage of OperatingIncomeBeforeDepreciation5.97.27.06.35.56.26.04.550.315.415.614.418.116.913.917.214.311.76.87.86.45.2

maa:SameStore



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value249247238237237235227230
Percentage of OperatingIncomeBeforeDepreciation94.192.893.093.794.593.894.095.5

maa:PaymentsToAcquireRealEstateAndOtherAssets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302013-03-312012-03-312011-12-312011-03-312010-12-31
Value58236131623201003063
Percentage of PaymentsToAcquireRealEstateAndOtherAssets100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value58236131621100720062761316861
Percentage of PaymentsToAcquireRealEstateAndOtherAssets100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.00.00.00.00.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

maa:PreferredUnitDividendsIncomeStatementImpact

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value922000.0922000.0922000.0922000.0922000.0922000.0922000.0922000.0922000.0922000.0922000.0922000.0922000.0-307000.00.00.00.00.00.00.00.0
Percentage of PreferredUnitDividendsIncomeStatementImpact100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.00.0

maa:PropertyOperatingExpenses



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value279275284278272268279271
Percentage of PropertyOperatingExpenses100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value279275284278272268279271
Percentage of PropertyOperatingExpenses100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

maa:UnitsIssuedDuringPeriodValueNewIssuesNet

maa:MAALP



Period End2020-03-312019-09-302019-03-312018-09-30
Value0010
Percentage of UnitsIssuedDuringPeriodValueNewIssuesNet100.0100.0100.0100.0

us-gaap:ConsolidatedEntities, us-gaap:PartnerCapitalComponents

maa:MAALP, maa:GeneralPartnersCapitalAccount



Period End2020-03-312019-09-302019-03-312018-09-30
Value0010
Percentage of UnitsIssuedDuringPeriodValueNewIssuesNet100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

maa:UnitsIssuedDuringPeriodValueUnitOptionsExercised

maa:MAALP



Period End2020-03-312019-09-302019-03-312018-09-30
Value71000.0-204000.0208000.0291000.0
Percentage of UnitsIssuedDuringPeriodValueUnitOptionsExercised100.0100.0100.0100.0

us-gaap:ConsolidatedEntities, us-gaap:PartnerCapitalComponents

maa:MAALP, maa:GeneralPartnersCapitalAccount



Period End2020-03-312019-09-302019-03-312018-09-30
Value71000.0-204000.0208000.0291000.0
Percentage of UnitsIssuedDuringPeriodValueUnitOptionsExercised100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

maa:UnitsRepurchasedAndRetiredDuringPeriodValue

maa:MAALP



Period End2020-03-312019-03-31
Value13
Percentage of UnitsRepurchasedAndRetiredDuringPeriodValue100.0100.0

us-gaap:ConsolidatedEntities, us-gaap:PartnerCapitalComponents

maa:MAALP, maa:GeneralPartnersCapitalAccount



Period End2020-03-312019-03-31
Value13
Percentage of UnitsRepurchasedAndRetiredDuringPeriodValue100.0100.0

us-gaap:AmortizationOfDebtDiscountPremium



Period End2020-03-312019-06-302019-03-312013-03-312012-03-312011-12-312011-09-302011-03-312010-03-31
Value111000000
Percentage of AmortizationOfDebtDiscountPremium100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value1119-1-1-117-2-9317-2-72
Percentage of AmortizationOfDebtDiscountPremium100.0100.0100.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value-2127-15-17-2718
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value-2127-15-17-2718
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:CommonStockDividendsPerShareDeclared

maa:MidAmericaApartmentCommunitiesIncShareholdersEquity



Period End2020-03-312019-09-302019-03-312018-09-30
Value1.00.960.960.9225
Percentage of CommonStockDividendsPerShareDeclared100.0100.0100.0100.0

us-gaap:ConstructionInProgressExpendituresIncurredButNotYetPaid



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302013-03-312012-03-312011-12-312011-09-302011-03-312010-03-31
Value25-5-6515-10-27100275
Percentage of ConstructionInProgressExpendituresIncurredButNotYetPaid100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value25-5-6515-10-2714-7-3-22122-2-112
Percentage of ConstructionInProgressExpendituresIncurredButNotYetPaid100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ConversionOfStockAmountConverted1



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302013-03-312012-03-312011-12-312011-09-302011-03-312010-12-312010-09-30
Value00000010000200
Percentage of ConversionOfStockAmountConverted1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:DebtInstrumentBasisSpreadOnVariableRate1

maa:A1BillionUnsecuredRevolvingCreditFacility, us-gaap:UnsecuredDebt



Period End2020-03-31
Value0.017
Percentage of DebtInstrumentBasisSpreadOnVariableRate1100.0

us-gaap:Range, us-gaap:DebtInstrument, us-gaap:LongtermDebtType

srt:Maximum, maa:A1BillionUnsecuredRevolvingCreditFacility, us-gaap:UnsecuredDebt



Period End2020-03-31
Value0.0145
Percentage of DebtInstrumentBasisSpreadOnVariableRate185.3

srt:Maximum, maa:WellsFargoTermLoan, us-gaap:UnsecuredDebt



Period End2020-03-31
Value0.0175
Percentage of DebtInstrumentBasisSpreadOnVariableRate1102.9

srt:Minimum, maa:A1BillionUnsecuredRevolvingCreditFacility, us-gaap:UnsecuredDebt



Period End2020-03-31
Value0.0075
Percentage of DebtInstrumentBasisSpreadOnVariableRate144.1

srt:Minimum, maa:WellsFargoTermLoan, us-gaap:UnsecuredDebt



Period End2020-03-31
Value0.009
Percentage of DebtInstrumentBasisSpreadOnVariableRate152.9

us-gaap:DepreciationAndAmortization



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value12612512412312212112412290333233313130302927272626
Percentage of DepreciationAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value12612512412312212112412212011911712612995767575
Percentage of DepreciationAndAmortization100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.00.00.00.0

us-gaap:DerivativeGainLossOnDerivativeNet



Period End2020-03-312019-03-31
Value-270
Percentage of DerivativeGainLossOnDerivativeNet100.0100.0

us-gaap:HedgingDesignation, us-gaap:IncomeStatementLocation

us-gaap:Nondesignated, us-gaap:InterestExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value-27-11540-202-2-54020000000000000000
Percentage of DerivativeGainLossOnDerivativeNet100.00.00.00.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-03-31
Value-270
Percentage of DerivativeGainLossOnDerivativeNet100.0100.0

us-gaap:HedgingDesignation, us-gaap:IncomeStatementLocation

us-gaap:DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet

us-gaap:DesignatedAsHedgingInstrument, us-gaap:InterestExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-30
Value0000000000000-1111-1112-21233-2833
Percentage of DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities, us-gaap:PartnerCapitalComponents

us-gaap:DistributionMadeToLimitedPartnerDistributionsDeclaredPerUnit

maa:MAALP, us-gaap:LimitedPartner



Period End2020-03-312019-09-302019-03-312018-09-30
Value1.00.960.960.9225
Percentage of DistributionMadeToLimitedPartnerDistributionsDeclaredPerUnit100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:DividendsCommonStock

maa:MidAmericaApartmentCommunitiesIncShareholdersEquity



Period End2020-03-312019-09-302019-03-312018-09-30
Value114109109105
Percentage of DividendsCommonStock100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount, us-gaap:StatementEquityComponents

maa:MidAmericaApartmentCommunitiesIncShareholdersEquity, us-gaap:AccumulatedDistributionsInExcessOfNetIncome



Period End2020-03-312019-09-302019-03-312018-09-30
Value114109109105
Percentage of DividendsCommonStock100.0100.0100.0100.0

us-gaap:DividendsPreferredStockCash



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302016-06-302016-03-31
Value922000.0922000.0922000.0922000.0922000.0922000.0922000.0922000.00.00.0
Percentage of DividendsPreferredStockCash100.0100.0100.0100.0100.0100.0100.0100.00.00.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value922000.0922000.0922000.0922000.0-922000.0-922000.0922000.0922000.0-922000.0-922000.0-922000.0-922000.0-922000.0-924000.00.00.00.0
Percentage of DividendsPreferredStockCash100.0100.0100.0100.0-100.0-100.0100.0100.00.00.00.00.00.00.00.00.00.0

us-gaap:GainLossOnDispositionOfAssets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value08010000
Percentage of GainLossOnDispositionOfAssets100.0100.0100.00.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value0810000000685800-1284710
Percentage of GainLossOnDispositionOfAssets100.0102.5-97.40.0100.0100.0100.00.00.00.00.00.00.00.00.00.00.0

us-gaap:GainLossOnSaleOfPropertyPlantEquipment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value080100000
Percentage of GainLossOnSaleOfPropertyPlantEquipment100.0100.0100.00.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value0801000000685800314700
Percentage of GainLossOnSaleOfPropertyPlantEquipment100.0100.0100.00.0100.0100.0100.0100.00.00.00.00.00.00.00.00.00.0

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-312009-09-302009-06-30
Value3815582646663546216162116161511979771069
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value3815582646663546250128119504342894845
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.00.00.00.0

us-gaap:IncomeLossFromEquityMethodInvestments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-09-302009-06-30
Value407000.0444000.0378000.0435000.0397000.0576000.0402000.0356000.060000.047000.054000.0-53000.0-72000.0-67000.0-31000.0-63000.0-107000.0-178000.0-245000.0-293000.0-282000.0-298000.0-276000.0-288000.0-156000.0
Percentage of IncomeLossFromEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value407000.0444000.0378000.0435000.0397000.0576000.0402000.0356000.0498000.0349000.0335000.0329000.0357000.0214000.00.0-101000.0128000.03000.0-1000.0-23000.019000.0
Percentage of IncomeLossFromEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:IncomeTaxesPaid



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value0002000
Percentage of IncomeTaxesPaid100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value00020000200200010
Percentage of IncomeTaxesPaid100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.00.00.00.00.0

us-gaap:InterestCostsCapitalized



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302013-03-312012-03-312011-03-31
Value1100000000
Percentage of InterestCostsCapitalized100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value11000000011220000
Percentage of InterestCostsCapitalized100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.00.00.00.00.0

us-gaap:InterestPaidNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302013-03-312012-03-312011-12-312011-09-302011-03-312010-03-31
Value25612366187323161616151314
Percentage of InterestPaidNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value2561236618732362244343552448254525
Percentage of InterestPaidNet100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.00.00.00.00.0

us-gaap:Ownership

us-gaap:LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest

maa:MAALP



Period End2020-03-312019-12-312019-03-312018-12-31
Value0.9660.00.9650.0
Percentage of LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest100.00.0100.00.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders

maa:MidAmericaApartmentCommunitiesIncShareholdersEquity



Period End2020-03-312019-09-302019-03-312018-09-30
Value4333
Percentage of MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount, us-gaap:StatementEquityComponents

maa:MidAmericaApartmentCommunitiesIncShareholdersEquity, maa:NoncontrollingInterestOperatingPartnership



Period End2020-03-312019-09-302019-03-312018-09-30
Value4333
Percentage of MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

us-gaap:MinorityInterestPeriodIncreaseDecrease

maa:MAALP



Period End2020-03-312019-09-302019-03-31
Value002
Percentage of MinorityInterestPeriodIncreaseDecrease100.0100.0100.0

us-gaap:ConsolidatedEntities, us-gaap:StatementEquityComponents

maa:MAALP, us-gaap:NoncontrollingInterest



Period End2020-03-312019-09-302019-03-31
Value002
Percentage of MinorityInterestPeriodIncreaseDecrease100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount, us-gaap:StatementEquityComponents

maa:MidAmericaApartmentCommunitiesIncShareholdersEquity, maa:NoncontrollingInterestOperatingPartnership



Period End2020-03-312019-09-302019-03-312018-09-30
Value47000.0272000.060000.0-266000.0
Percentage of MinorityInterestPeriodIncreaseDecrease11.728.52.10.0

maa:MidAmericaApartmentCommunitiesIncShareholdersEquity, us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-09-302019-03-312018-09-30
Value-47000.0-272000.0-60000.0266000.0
Percentage of MinorityInterestPeriodIncreaseDecrease-11.7-28.5-2.10.0

us-gaap:ConsolidatedEntities, us-gaap:PartnerCapitalComponents

us-gaap:NetIncomeLossAllocatedToGeneralPartners

maa:MAALP, maa:GeneralPartnersCapitalAccount



Period End2020-03-312019-09-302019-03-312018-09-30
Value35776251
Percentage of NetIncomeLossAllocatedToGeneralPartners100.0100.0100.0100.0

us-gaap:ConsolidatedEntities, us-gaap:PartnerCapitalComponents

us-gaap:NetIncomeLossAllocatedToLimitedPartners

maa:MAALP, us-gaap:LimitedPartner



Period End2020-03-312019-09-302019-03-312018-09-30
Value1221
Percentage of NetIncomeLossAllocatedToLimitedPartners100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax

maa:MAALP



Period End2020-03-312019-09-302019-03-312018-09-30
Value0-5-33
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax100.0100.0100.0100.0

us-gaap:ConsolidatedEntities, us-gaap:StatementEquityComponents

maa:MAALP, us-gaap:AociAttributableToNoncontrollingInterest



Period End2020-03-312019-09-302019-03-312018-09-30
Value0-5-33
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

maa:MidAmericaApartmentCommunitiesIncShareholdersEquity



Period End2020-03-312019-09-302019-03-312018-09-30
Value0-5-33
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount, us-gaap:StatementEquityComponents

maa:MidAmericaApartmentCommunitiesIncShareholdersEquity, maa:NoncontrollingInterestOperatingPartnership



Period End2020-03-312019-09-302019-03-312018-09-30
Value9000.0-195000.0-113000.0127000.0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax3.63.33.53.4

maa:MidAmericaApartmentCommunitiesIncShareholdersEquity, us-gaap:AccumulatedOtherComprehensiveIncome



Period End2020-03-312019-09-302019-03-312018-09-30
Value0-5-33
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax96.496.796.596.6

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value-253000.013000.0411000.0578000.0745000.0642000.0548000.0555000.0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value-253000.013000.0411000.0578000.0745000.0642000.0548000.0555000.0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherCostAndExpenseOperating



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-312009-09-302009-06-30
Value1413131313121111998888788776554
Percentage of OtherCostAndExpenseOperating100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value14131313131211111281310108766
Percentage of OtherCostAndExpenseOperating100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.00.00.00.0

us-gaap:OtherOperatingActivitiesCashFlowStatement



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value-38-414321-32-5357
Percentage of OtherOperatingActivitiesCashFlowStatement100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value-38-414321-32-5357
Percentage of OtherOperatingActivitiesCashFlowStatement100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementBusinessSegments

us-gaap:OtherOperatingIncome

maa:NonSameStoreAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value36000.0767000.0137000.0179000.0172000.0-332000.0332000.0353000.0
Percentage of OtherOperatingIncome100.0100.0100.0100.0100.0100.0100.0100.0

maa:SameStore



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value22333233
Percentage of OtherOperatingIncome7375.0291.82351.82029.11782.6-722.3953.9948.7

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:PartnersCapitalAccountContributions

maa:MidAmericaApartmentCommunitiesIncShareholdersEquity



Period End2020-03-312019-09-302019-03-31
Value002
Percentage of PartnersCapitalAccountContributions100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount, us-gaap:StatementEquityComponents

maa:MidAmericaApartmentCommunitiesIncShareholdersEquity, us-gaap:NoncontrollingInterest



Period End2020-03-312019-09-302019-03-31
Value002
Percentage of PartnersCapitalAccountContributions100.0100.0100.0

us-gaap:PaymentsForCapitalImprovements



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302013-03-312012-03-312011-12-312011-09-302011-03-312010-03-31
Value84838680536266812133221
Percentage of PaymentsForCapitalImprovements100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value84838680536266745126131351515202816
Percentage of PaymentsForCapitalImprovements100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.00.00.00.00.0

us-gaap:PaymentsOfDividendsCommonStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302013-03-312012-03-312011-12-312011-09-302011-03-312010-03-31
Value114109109109109105104292523232217
Percentage of PaymentsOfDividendsCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value118113113113113108108
Percentage of PaymentsOfDividendsCommonStock103.6103.8103.6103.6103.6103.6103.4

us-gaap:PaymentsOfDividendsMinorityInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302013-03-312012-03-312011-12-312011-09-302011-03-312010-03-31
Value4433333111111
Percentage of PaymentsOfDividendsMinorityInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsToAcquireEquityMethodInvestments



Period End2020-03-312019-12-312019-09-302018-12-312018-09-302013-03-312012-03-312011-12-312011-09-302011-03-312010-03-31
Value00110000015
Percentage of PaymentsToAcquireEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302018-12-312018-09-30
Value00110
Percentage of PaymentsToAcquireEquityMethodInvestments100.0100.0100.0100.0100.0

us-gaap:PreferredStockDividendRatePercentage



Period End2020-03-312019-12-312019-09-30
Value0.0850.00.0
Percentage of PreferredStockDividendRatePercentage100.00.00.0

us-gaap:PreferredStockDividendsIncomeStatementImpact



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value922000.0922000.0922000.0922000.0922000.0922000.0922000.0922000.00.00.00.00.00.00.0
Percentage of PreferredStockDividendsIncomeStatementImpact100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.0

us-gaap:ProceedsFromLinesOfCredit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value130020400145760425
Percentage of ProceedsFromLinesOfCredit100.00.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value130020400145760425205150225205220155
Percentage of ProceedsFromLinesOfCredit100.00.0100.0100.0100.0100.0100.00.00.00.00.00.00.0

us-gaap:ProceedsFromPaymentsForOtherFinancingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value-11200100
Percentage of ProceedsFromPaymentsForOtherFinancingActivities100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-112001000-2
Percentage of ProceedsFromPaymentsForOtherFinancingActivities100.0100.0100.0100.0100.0100.0100.00.00.0

us-gaap:ProceedsFromRepaymentsOfCommercialPaper



Period End2020-03-312019-12-312019-09-30
Value-70-130-167
Percentage of ProceedsFromRepaymentsOfCommercialPaper100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-30
Value-70-130-167
Percentage of ProceedsFromRepaymentsOfCommercialPaper100.0100.0100.0

us-gaap:ProceedsFromSaleOfRealEstateHeldforinvestment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302013-03-312012-03-312011-12-312011-09-302011-03-31
Value015810131202912100
Percentage of ProceedsFromSaleOfRealEstateHeldforinvestment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value0158101312105978810109149532
Percentage of ProceedsFromSaleOfRealEstateHeldforinvestment100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ProceedsFromStockOptionsExercised



Period End2020-03-312019-09-302019-06-302019-03-312018-09-30
Value100000.0-200000.01000000.0200000.0300000.0
Percentage of ProceedsFromStockOptionsExercised100.0100.0100.0100.0100.0

us-gaap:RealEstateTaxesAndInsurance



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-312009-09-302009-06-30
Value6158595759555755161615141413121212121111111111
Percentage of RealEstateTaxesAndInsurance100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value6158595759555755555152545338343435
Percentage of RealEstateTaxesAndInsurance100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.00.00.00.0

us-gaap:RepaymentsOfLinesOfCredit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value30020475610670165
Percentage of RepaymentsOfLinesOfCredit100.00.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value3002047561067016554511014511563075
Percentage of RepaymentsOfLinesOfCredit100.00.0100.0100.0100.0100.0100.00.00.00.00.00.00.0

us-gaap:RepaymentsOfNotesPayable



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302013-03-312012-03-312011-12-312011-09-302011-03-312010-03-31
Value1188164301153230210-88000
Percentage of RepaymentsOfNotesPayable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value1188164301153230224168166159183177135
Percentage of RepaymentsOfNotesPayable100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.00.00.00.00.0

us-gaap:DerivativeInstrumentRisk

us-gaap:StockIssuedDuringPeriodSharesNewIssues

us-gaap:StockOption



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-30
Value918.03538.017891.02827.05223.00.012600.00.010340.00.00.0
Percentage of StockIssuedDuringPeriodSharesNewIssues100.0100.0100.0100.0100.00.0100.00.0100.00.00.0

us-gaap:PartnerTypeOfPartnersCapitalAccount, us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodValueConversionOfUnits

maa:MidAmericaApartmentCommunitiesIncShareholdersEquity, maa:NoncontrollingInterestOperatingPartnership



Period End2020-03-312019-09-302019-03-31
Value-450000.0-836000.0-336000.0
Percentage of StockIssuedDuringPeriodValueConversionOfUnits100.0100.0100.0

maa:MidAmericaApartmentCommunitiesIncShareholdersEquity, us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-09-302019-03-31
Value450000.0836000.0336000.0
Percentage of StockIssuedDuringPeriodValueConversionOfUnits-100.0-100.0-100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:StockIssuedDuringPeriodValueNewIssues

maa:MidAmericaApartmentCommunitiesIncShareholdersEquity



Period End2020-03-312019-09-302019-03-312018-09-30
Value0010
Percentage of StockIssuedDuringPeriodValueNewIssues100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount, us-gaap:StatementEquityComponents

maa:MidAmericaApartmentCommunitiesIncShareholdersEquity, us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-09-302019-03-312018-09-30
Value0010
Percentage of StockIssuedDuringPeriodValueNewIssues100.0100.099.9100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised

maa:MidAmericaApartmentCommunitiesIncShareholdersEquity



Period End2020-03-312019-09-302019-03-312018-09-30
Value71000.0-204000.0208000.0291000.0
Percentage of StockIssuedDuringPeriodValueStockOptionsExercised100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount, us-gaap:StatementEquityComponents

maa:MidAmericaApartmentCommunitiesIncShareholdersEquity, us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-09-302019-03-312018-09-30
Value71000.0-204000.0208000.0291000.0
Percentage of StockIssuedDuringPeriodValueStockOptionsExercised100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:StockRepurchasedAndRetiredDuringPeriodValue

maa:MidAmericaApartmentCommunitiesIncShareholdersEquity



Period End2020-03-312019-03-31
Value13
Percentage of StockRepurchasedAndRetiredDuringPeriodValue100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount, us-gaap:StatementEquityComponents

maa:MidAmericaApartmentCommunitiesIncShareholdersEquity, us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-03-31
Value13
Percentage of StockRepurchasedAndRetiredDuringPeriodValue100.0100.0

us-gaap:WeightedAverageNumberDilutedSharesOutstandingAdjustment



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302009-09-302009-06-30
Value383000.0260000.0249000.0207000.0239000.0207000.00.00.080000.035000.045000.0102000.081000.0105000.097000.0101000.0108000.077000.079000.0
Percentage of WeightedAverageNumberDilutedSharesOutstandingAdjustment100.0100.0100.0100.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-31
Value383.0260.0249.0207000.0239000.0207000.00.0219000.0211000.0307000.00.00.0240000.0
Percentage of WeightedAverageNumberDilutedSharesOutstandingAdjustment0.10.10.1100.0100.0100.00.00.00.00.00.00.00.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:WeightedAverageNumberOfLimitedPartnershipAndGeneralPartnershipUnitOutstandingBasicAndDiluted

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value0000117011711711701171171173797975
Percentage of WeightedAverageNumberOfLimitedPartnershipAndGeneralPartnershipUnitOutstandingBasicAndDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

maa:BuildingsImprovementsAndOther



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value1189711841118251177511670
Percentage of BuildingsImprovementsAndOther100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value1189711841118251177511670
Percentage of BuildingsImprovementsAndOther100.0100.0100.0100.0100.0

maa:CommonSharesAndOperatingPartnershipUnitsOutstanding



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value118118118118118117117117117117117117117117797979797979797979797979444444444342423939383634
Percentage of CommonSharesAndOperatingPartnershipUnitsOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

maa:CommonSharesIssuableUponConversionOfConvertibleStock

us-gaap:NoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value44444444
Percentage of CommonSharesIssuableUponConversionOfConvertibleStock100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

maa:LiabilitiesAndCapital

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value1115511230112471127411323
Percentage of LiabilitiesAndCapital100.0100.0100.0100.0100.0

us-gaap:DebtInstrument

maa:NotesPayableExcludingInterestRateSwapsAndCapAgreements

maa:FixedRateDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-03-312011-12-31
Value41004100380036003600310035003500310031603230340029803000249025702570261024202450247025002460248023002290743748731732732538
Percentage of NotesPayableExcludingInterestRateSwapsAndCapAgreements100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

maa:FloatingRateDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-03-312011-12-31
Value400400500900100011001100100014001300130011701580150094592087082010109901010102097010001160118011009429609419411111
Percentage of NotesPayableExcludingInterestRateSwapsAndCapAgreements9.89.813.225.027.835.531.428.645.241.140.234.453.050.038.035.833.931.441.740.440.940.839.440.350.451.5148.0125.9131.3128.5128.5206.6

maa:OperatingPartnershipUnitsOutstanding



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value1181181181181181171171171171171171171171177979797979797979797979794444444411111222
Percentage of OperatingPartnershipUnitsOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

maa:ParentLPStockholdersEquityIncludingPortionAttributableToNoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value62086283622962666369
Percentage of ParentLPStockholdersEquityIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0

us-gaap:Range

maa:PercentageOfOwnershipInterests

srt:Minimum



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value0.80.80.80.80.80.9250.9250.925
Percentage of PercentageOfOwnershipInterests100.0100.0100.0100.0100.0100.0100.0100.0

maa:RealEstateAssetsNet



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value1096510987110041106711151272327462716269426982519241724232329225321092085202719361935
Percentage of RealEstateAssetsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value10965109871100411067110991115111196112631119311261112791134411371113416718
Percentage of RealEstateAssetsNet100.0100.0100.0100.00.0100.00.00.00.00.00.00.00.00.00.0

us-gaap:StatementEquityComponents

maa:RedeemableCapitalSharesParOrStatedValuePerShare

us-gaap:NoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value103.03131.86130.01117.76109.3395.7100.18100.67
Percentage of RedeemableCapitalSharesParOrStatedValuePerShare100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

maa:StockholdersEquityIncludingNoncontrollingInterest

maa:MidAmericaApartmentCommunitiesIncShareholdersEquity



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value621562896236627263256372643164796573
Percentage of StockholdersEquityIncludingNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount, us-gaap:StatementEquityComponents

maa:MidAmericaApartmentCommunitiesIncShareholdersEquity, maa:NoncontrollingInterestOperatingPartnership



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value211214213215218220221224231
Percentage of StockholdersEquityIncludingNoncontrollingInterest3.43.43.43.43.43.53.43.53.5

maa:MidAmericaApartmentCommunitiesIncShareholdersEquity, us-gaap:AccumulatedDistributionsInExcessOfNetIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value-1160-1085-1119-1086-1037-989-940-887-784
Percentage of StockholdersEquityIncludingNoncontrollingInterest-18.7-17.3-18.0-17.3-16.4-15.5-14.6-13.7-11.9

maa:MidAmericaApartmentCommunitiesIncShareholdersEquity, us-gaap:AccumulatedOtherComprehensiveIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value-12-13-14-9-301172
Percentage of StockholdersEquityIncludingNoncontrollingInterest-0.2-0.2-0.2-0.1-0.1-0.00.20.10.0

maa:MidAmericaApartmentCommunitiesIncShareholdersEquity, us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value717071667149714671417138713571307121
Percentage of StockholdersEquityIncludingNoncontrollingInterest115.4113.9114.6113.9112.9112.0110.9110.1108.3

maa:MidAmericaApartmentCommunitiesIncShareholdersEquity, us-gaap:CommonStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value111111111
Percentage of StockholdersEquityIncludingNoncontrollingInterest0.00.00.00.00.00.00.00.00.0

maa:MidAmericaApartmentCommunitiesIncShareholdersEquity, us-gaap:NoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value666552222
Percentage of StockholdersEquityIncludingNoncontrollingInterest0.10.10.10.10.10.00.00.00.0

maa:UndevelopedLand



Period End2020-03-312019-12-312019-09-302018-12-31
Value34344158
Percentage of UndevelopedLand100.0100.0100.0100.0

us-gaap:AccruedLiabilitiesCurrentAndNoncurrent



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value44547252145041310996869410189799193827273806769
Percentage of AccruedLiabilitiesCurrentAndNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value445472521450419413473409390405439381368414226
Percentage of AccruedLiabilitiesCurrentAndNoncurrent100.0100.0100.0100.00.0100.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedDistributionsInExcessOfNetIncome



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value1160108511191086989567582612603596624625621614605589575559541510
Percentage of AccumulatedDistributionsInExcessOfNetIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value7170716671497146713815621569156515421520149414911375131012641230114210851074988
Percentage of AdditionalPaidInCapital100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InvestmentType

us-gaap:AreaOfRealEstateProperty

us-gaap:CommercialRealEstate



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value00000000000000000000001
Percentage of AreaOfRealEstateProperty100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Retail



Period End2020-03-312019-12-312019-03-312018-12-312018-09-302018-06-30
Value630000.0630000.0615000.0615000.0615000.0610000.0
Percentage of AreaOfRealEstateProperty242.3242.3236.5236.5236.5234.6

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:Capital

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value620862836229626663206369642964776518657165486529658466393157
Percentage of Capital100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CommonStockValueOutstanding



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value11111000000000000000
Percentage of CommonStockValueOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConstructionInProgressGross



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value15811610197591663147515261757453353120113410
Percentage of ConstructionInProgressGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value15811610197575953689311615625824223144
Percentage of ConstructionInProgressGross100.0100.0100.0100.00.0100.00.00.00.00.00.00.00.00.00.0

us-gaap:StatementScenario, us-gaap:InvestmentType

maa:CostsIncurredToDate, maa:DevelopmentProperties



Period End2020-03-312019-12-31
Value184143
Percentage of ConstructionInProgressGross116.2123.6

us-gaap:CreditFacility

us-gaap:DebtInstrumentFaceAmount

us-gaap:CommercialPaper



Period End2020-03-312019-12-312019-06-30
Value070367
Percentage of DebtInstrumentFaceAmount0.0100.0100.0

us-gaap:DebtInstrument, us-gaap:LongtermDebtType

maa:WellsFargoTermLoan, us-gaap:UnsecuredDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value300300300300300300300300300300300300300300250250250250250250250250
Percentage of DebtInstrumentFaceAmount0.0428.60.081.70.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:PrivatePlacement, us-gaap:UnsecuredDebt



Period End2020-03-312019-12-312019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value222222242242242242292292
Percentage of DebtInstrumentFaceAmount0.0317.165.90.00.00.00.00.0

us-gaap:DebtInstrument, us-gaap:LongtermDebtType, maa:DebtInformation

maa:A1BillionUnsecuredRevolvingCreditFaciltiy, us-gaap:UnsecuredDebt, maa:FairMarketValueAdjustmentandDebtIssuanceCost



Period End2020-03-31
Value-12
Percentage of DebtInstrumentFaceAmount0.0

us-gaap:IncomeNotes, us-gaap:UnsecuredDebt, maa:FixedRateDebtSeniorNotes



Period End2020-03-312019-06-30
Value32502700
Percentage of DebtInstrumentFaceAmount0.0735.7

us-gaap:PrivatePlacement, us-gaap:UnsecuredDebt, maa:FixedRateDebtSeniorNotes



Period End2020-03-312019-06-30
Value222242
Percentage of DebtInstrumentFaceAmount0.065.9

us-gaap:LongtermDebtType, maa:DebtInformation

us-gaap:UnsecuredDebt, maa:FixedRateDebtSeniorNotes



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value34723472319229422642
Percentage of DebtInstrumentFaceAmount0.04960.00.0801.60.0

us-gaap:DebtInstrumentInterestRateEffectivePercentage



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value0.0380.0380.0380.0380.0390.0380.0370.0370.0360.0360.0350.0360.0340.0350.0360.0370.0370.0370.0360.0360.0370.0370.0370.0380.0380.0390.0320.0350.0360.0380.0370.0380.0380.0370.0390.038
Percentage of DebtInstrumentInterestRateEffectivePercentage100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtInstrument, us-gaap:LongtermDebtType

maa:VariableRateDebt, us-gaap:UnsecuredDebt



Period End2020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.0250.0310.0340.0340.0330.0310.0290.026
Percentage of DebtInstrumentInterestRateEffectivePercentage65.881.689.587.286.883.878.472.2

us-gaap:LongtermDebtType

us-gaap:SecuredDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312011-12-312011-09-30
Value0.0450.0450.0460.0450.0450.0460.0390.0390.0380.0380.0360.0360.0360.0350.0350.0360.0360.0350.0330.0340.0350.0340.0340.0360.0340.0350.0350.0350.0370.0380.0360.038
Percentage of DebtInstrumentInterestRateEffectivePercentage118.4118.4121.1118.4115.4121.1105.4105.4105.6105.6102.9100.0105.9100.097.297.397.394.691.794.494.691.991.994.789.589.7109.4100.0102.8100.097.397.4

us-gaap:UnsecuredDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312011-12-312011-09-30
Value0.0370.0370.0370.0370.0380.0370.0370.0370.0350.0350.0350.0360.0340.0340.0360.0370.0370.0380.0380.0380.0380.0390.040.040.0430.0430.0270.0330.0340.0370.0510.0515
Percentage of DebtInstrumentInterestRateEffectivePercentage97.497.497.497.497.497.4100.0100.097.297.2100.0100.0100.097.1100.0100.0100.0102.7105.6105.6102.7105.4108.1105.3113.2110.384.494.394.497.4137.8132.1

us-gaap:LongtermDebtType, maa:DebtInformation

us-gaap:SecuredDebt, maa:FixedRateDebtSeniorNotes



Period End2020-03-312019-12-312019-09-302019-06-30
Value0.0450.0450.0460.045
Percentage of DebtInstrumentInterestRateEffectivePercentage118.4118.4121.1118.4

us-gaap:UnsecuredDebt, maa:FixedRateDebtSeniorNotes



Period End2020-03-312019-12-312019-09-302019-06-30
Value0.0390.0390.0390.04
Percentage of DebtInstrumentInterestRateEffectivePercentage102.6102.6102.6105.3

us-gaap:UnsecuredDebt, maa:VariableRateCreditFacility



Period End2020-03-31
Value0.017
Percentage of DebtInstrumentInterestRateEffectivePercentage44.7

us-gaap:FairValueByMeasurementFrequency

us-gaap:EmbeddedDerivativeFairValueOfEmbeddedDerivativeAsset

us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
Value836382218182021182118141410
Percentage of EmbeddedDerivativeFairValueOfEmbeddedDerivativeAsset100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:GeneralPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value594360155964599360386083612861776221627062496230627963372993
Percentage of GeneralPartnersCapitalAccount100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:GeneralPartnersCapitalAccountUnitsOutstanding



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value11411411411411311311311311311311311311311375757575757575757575757442424242
Percentage of GeneralPartnersCapitalAccountUnitsOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value11411411411411311311311311311311311311311375
Percentage of GeneralPartnersCapitalAccountUnitsOutstanding100.0100.0100.0100.099.9100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LandAvailableForDevelopment

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value3434585858314150575764717151
Percentage of LandAvailableForDevelopment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value211214213215218220221224226231231231233235165
Percentage of LimitedPartnersCapitalAccount100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:NoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value418536529481448393412416
Percentage of LimitedPartnersCapitalAccount197.7249.9248.0223.6205.9178.8185.8185.2

us-gaap:LimitedPartnersCapitalAccountUnitsOutstanding



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value444444444444444444444444441111
Percentage of LimitedPartnersCapitalAccountUnitsOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value444444444444444
Percentage of LimitedPartnersCapitalAccountUnitsOutstanding100.0100.0100.0100.0100.1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:LineOfCredit

maa:A1BillionUnsecuredRevolvingCreditFacility, us-gaap:UnsecuredDebt



Period End2020-03-31
Value100
Percentage of LineOfCredit100.0

us-gaap:LongtermDebtType, maa:DebtInformation

us-gaap:SecuredDebt, maa:FairMarketValueAdjustmentandDebtIssuanceCost



Period End2020-03-312019-09-302019-06-30
Value-3-3-3
Percentage of LineOfCredit-3.40.00.0

us-gaap:UnsecuredDebt, maa:VariableRateCreditFacility



Period End2020-03-312018-12-31
Value100540
Percentage of LineOfCredit100.00.0

us-gaap:LossContingencyAccrualAtCarryingValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-312012-12-31
Value889888232931323538414299141313131212110
Percentage of LossContingencyAccrualAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:MinorityInterestInJointVentures



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312016-12-31
Value666522
Percentage of MinorityInterestInJointVentures100.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value666552222222220
Percentage of MinorityInterestInJointVentures100.0100.0100.0100.00.0100.00.00.00.00.00.00.00.0100.30.0

us-gaap:MinorityInterestInOperatingPartnerships



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value211214213215220
Percentage of MinorityInterestInOperatingPartnerships100.0100.0100.0100.0100.0

us-gaap:LongtermDebtType, maa:DebtInformation

us-gaap:MortgageLoansOnRealEstate

us-gaap:SecuredDebt, maa:FixedRateDebtSeniorNotes



Period End2020-03-312019-12-312019-06-302018-12-31
Value628629663476
Percentage of MortgageLoansOnRealEstate100.0100.0100.0100.0

us-gaap:NotesPayable



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value44834454447645394548453045044548449845004492457345574499343434893443342734253442347935243430347534633472186016911691167317061589154016491587153514511500155113631399
Percentage of NotesPayable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LongtermDebtType

us-gaap:SecuredDebt



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302013-12-312012-12-31
Value62462664566047511091129129612381243124713731413142915921554156317901190
Percentage of NotesPayable13.914.114.414.510.524.724.728.436.135.636.240.141.141.145.245.345.051.671.1

us-gaap:UnsecuredDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302013-12-312012-12-31
Value3859382838303879388640533582362135663525338234433260318021952246219621412051202820501932187519121681483
Percentage of NotesPayable86.185.985.685.585.489.579.579.679.378.475.375.371.670.763.964.463.862.559.958.958.954.854.755.048.428.9

us-gaap:DebtInstrument

us-gaap:NotesPayableFairValueDisclosure

maa:FixedRateDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value44004500410038003700310035003500320032903410355031203130268027602720271024602480255025402490251023302300785783782777723613563560567312238
Percentage of NotesPayableFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

maa:FloatingRateDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value4004005009001000110011001000140013001300117515911511934910840820990970990970880910107011201000865882860956983949105398310371151
Percentage of NotesPayableFairValueDisclosure9.18.912.223.727.035.531.428.643.839.538.133.151.048.334.933.030.930.340.239.138.838.235.336.345.948.7127.4110.5112.8110.6132.2160.4168.6188.0173.4332.4483.6

us-gaap:NumberOfRealEstateProperties



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-30
Value299.0299.0303.0303.0303.0303.0303.0304.0302.0302.0302.0305.0304.0303.0251.0256.0255.0254.0253.0254.0265.0268.0265.0271.0271.0275.0160.0164.0166.0167.0168.0167.0165.0164.0
Percentage of NumberOfRealEstateProperties100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InvestmentType

maa:DevelopmentProperties



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-31
Value7.07.06.05.05.03.04.04.02.03.05.06.07.09.03.04.04.05.04.04.03.02.02.02.04.05.02.02.02.03.03.03.0
Percentage of NumberOfRealEstateProperties2.32.32.01.71.71.01.31.30.71.01.72.02.33.01.21.61.62.01.61.61.10.70.80.71.51.81.21.21.21.81.81.8

us-gaap:CommercialRealEstate



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value4.04.04.04.04.04.04.04.04.04.04.01.01.01.02.02.03.03.03.04.0
Percentage of NumberOfRealEstateProperties1.31.31.31.31.31.31.31.31.31.31.30.40.40.40.80.71.11.11.11.5

us-gaap:Retail



Period End2020-03-312019-12-312019-03-312018-12-312018-09-302018-06-30
Value32.032.030.030.030.029.0
Percentage of NumberOfRealEstateProperties10.710.79.99.99.99.5

us-gaap:InvestmentType, us-gaap:StatementScenario

maa:DevelopmentProperties, us-gaap:ScenarioForecast



Period End2021-06-302020-12-312020-06-302019-12-31
Value1.01.01.02.0
Percentage of NumberOfRealEstateProperties0.00.00.00.7

us-gaap:StatementScenario

srt:ScenarioForecast



Period End2021-12-31
Value2.0
Percentage of NumberOfRealEstateProperties0.0

us-gaap:StatementScenario, us-gaap:InvestmentType

srt:ScenarioForecast, maa:DevelopmentProperties



Period End2022-12-312021-12-312021-09-302020-12-312020-09-302019-12-31
Value1.04.01.01.01.01.0
Percentage of NumberOfRealEstateProperties0.00.00.00.00.00.3

us-gaap:NumberOfStatesInWhichEntityOperates



Period End2020-03-312019-12-312019-09-302019-06-30
Value16.016.017.017.0
Percentage of NumberOfStatesInWhichEntityOperates100.0100.0100.0100.0

us-gaap:OperatingLeaseLiability



Period End2020-03-312019-12-312019-09-302019-06-302019-03-31
Value3233333333
Percentage of OperatingLeaseLiability100.0100.0100.0100.0100.0

us-gaap:OtherAssets



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value141172178149120474332293328262926212625221719
Percentage of OtherAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value14117217814914412013412213513512011612413458
Percentage of OtherAssets100.0100.0100.0100.00.0100.00.00.00.00.00.00.00.00.00.0

us-gaap:ConsolidatedEntities

us-gaap:PartnersCapital

maa:MAALP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value621562896236627263256372643164796573
Percentage of PartnersCapital100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities, us-gaap:PartnerCapitalComponents

maa:MAALP, maa:GeneralPartnersCapitalAccount



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value594360155964599360386083612861776270
Percentage of PartnersCapital95.695.695.695.695.595.595.395.395.4

maa:MAALP, us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value211214213215218220221224231
Percentage of PartnersCapital3.43.43.43.43.43.53.43.53.5

us-gaap:ConsolidatedEntities, us-gaap:StatementEquityComponents

maa:MAALP, us-gaap:AociAttributableToNoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value-13-13-15-9-301282
Percentage of PartnersCapital-0.2-0.2-0.2-0.1-0.1-0.00.20.10.0

maa:MAALP, us-gaap:NoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value666552222
Percentage of PartnersCapital0.10.10.10.10.10.00.00.00.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value621562896236627263256372643164796520657365506532658666423157
Percentage of PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PreferredStockLiquidationPreference



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312010-12-312010-09-302010-06-302009-12-31
Value50.050.050.050.050.050.050.050.050.050.050.050.050.050.025.025.025.025.0
Percentage of PreferredStockLiquidationPreference100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PreferredStockSharesAuthorized



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312010-12-312010-09-302010-06-302009-12-31
Value202020202020202000020000
Percentage of PreferredStockSharesAuthorized100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:BusinessAcquisition

us-gaap:PreferredStockSharesOutstanding

us-gaap:RedeemablePreferredStock



Period End2020-03-312019-12-312019-09-302019-06-302016-12-01
Value867846.0867846.0867846.0867846.0868000.0
Percentage of PreferredStockSharesOutstanding100.0100.0100.0100.0100.0

us-gaap:PreferredStockValueOutstanding



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312010-06-302009-12-31
Value9000.09000.09000.09000.09000.031000.062000.0
Percentage of PreferredStockValueOutstanding100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:PreferredUnitsIssued

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value867846.0867846.0867846.0867846.0867846.0867846.0867846.0867846.0867846.0867846.0867846.0867846.0867846.0867846.00.0
Percentage of PreferredUnitsIssued100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:PreferredUnitsOutstanding

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value867846.0867846.0867846.0867846.0867846.0867846.0867846.0867846.0867846.0867846.0867846.0867846.0867846.0867846.00.0
Percentage of PreferredUnitsOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:PreferredUnitsPreferredPartnersCapitalAccounts

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value66666666666666666666666666640
Percentage of PreferredUnitsPreferredPartnersCapitalAccounts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:RealEstateInvestmentPropertyAccumulatedDepreciation



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value308029552906279125491068105110591027995990980961937937917889862836788
Percentage of RealEstateInvestmentPropertyAccumulatedDepreciation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value308029552906279126682549243923162194207519671851176816561482
Percentage of RealEstateInvestmentPropertyAccumulatedDepreciation100.0100.0100.0100.00.0100.00.00.00.00.00.00.00.00.00.0

us-gaap:RealEstateInvestmentPropertyAtCost



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value1396713864138251375713598377637823766370736793495337133593240316329982948286527512704
Percentage of RealEstateInvestmentPropertyAtCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value13967138641382513757136661359813558134931329313234131261304313011128698138
Percentage of RealEstateInvestmentPropertyAtCost100.0100.0100.0100.00.0100.00.00.00.00.00.00.00.00.00.0

us-gaap:RealEstateInvestmentPropertyNet



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value1088610908109191096511049270727302706267926832504239123972303222620812058200219141916
Percentage of RealEstateInvestmentPropertyNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value10886109081091910965109971104911119111771109811159111581119111242112136655
Percentage of RealEstateInvestmentPropertyNet100.0100.0100.0100.00.0100.00.00.00.00.00.00.00.00.00.0

us-gaap:RealEstateInvestmentsJointVentures



Period End2020-03-31
Value23
Percentage of RealEstateInvestmentsJointVentures100.0

us-gaap:BalanceSheetLocation

us-gaap:OtherAssets



Period End2020-03-312019-12-31
Value1313
Percentage of RealEstateInvestmentsJointVentures58.40.0

us-gaap:ProductOrService, us-gaap:RealEstateProperties

us-gaap:RealEstate, maa:PostMassachusettsAvenue



Period End2020-03-312019-12-312018-12-31
Value434344
Percentage of RealEstateInvestmentsJointVentures183.60.00.0

us-gaap:RestrictedCash



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value145016161417332878
Percentage of RestrictedCash100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
Value1450161614173328227880272488
Percentage of RestrictedCash100.0100.0100.0100.0100.0100.0100.0100.00.0100.00.00.00.00.0

us-gaap:SecuredDebt



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302010-12-31
Value6246266456604751050110611141190119212261353151414521500
Percentage of SecuredDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value62462664566066147592192693297611091129129613191286
Percentage of SecuredDebt100.0100.0100.0100.00.0100.00.00.00.00.00.00.00.00.00.0

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312017-12-312016-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-312008-12-312007-12-31
Value621562896236627263726573664210301011962945925865863743678640623540485497453442429
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value111413129
Percentage of TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value111413121199971010109108
Percentage of TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests100.0100.0100.0100.00.0100.00.00.00.00.00.00.00.00.00.0

us-gaap:TemporaryEquitySharesOutstanding



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value00000000000000620005658
Percentage of TemporaryEquitySharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value109354.0107162.0105040.0102779.0101025.098371.095899.093475.085289.0103504.0101081.098771.090217.0103578.090844.0
Percentage of TemporaryEquitySharesOutstanding100.0100.0100.0100.00.0100.00.00.00.00.00.00.00.00.00.0

us-gaap:UnsecuredDebt



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-30
Value38593828383038794053810585577483514363187135135
Percentage of UnsecuredDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtInstrument, us-gaap:LongtermDebtType

maa:VariableRateDebt, us-gaap:UnsecuredDebt



Period End2020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value300150300600600300300300300
Percentage of UnsecuredDebt7.83.97.70.014.80.00.00.00.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value385938283830387938864053358236213566352533823443326031802141
Percentage of UnsecuredDebt100.0100.0100.0100.00.0100.00.00.00.00.00.00.00.00.00.0

Line plots across dimensions of each concept

us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:StatementBusinessSegments


us-gaap:Revenues us-gaap:StatementBusinessSegments


us-gaap:Assets us-gaap:StatementBusinessSegments