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Shareholders' Equity of MAA - Schedule of Cumulative Redeemable Preferred Stock (Parenthetical) (Details) $ in Millions | Mar. 31, 2020 USD ($)
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M A A Equity [Abstract] |
Preferred Stock, Liquidation Preference, Value | $ 43.4

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- Definition MAA Equity. + References No definition available. + Details
Name: | maa_MAAEquityAbstract
Namespace Prefix: | maa_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Value of the difference between preference in liquidation and the par or stated values of the preferred shares. + References No definition available. + Details
Name: | us-gaap_PreferredStockLiquidationPreferenceValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant