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Shareholders' Equity of MAA - Schedule of Cumulative Redeemable Preferred Stock (Parenthetical) (Details) $ in Millions	Sep. 30, 2019 USD ($)
M A A Equity [Abstract]
Preferred Stock, Liquidation Preference, Value	$ 43.4

X

- Definition

MAA Equity.

+ References

No definition available.

+ Details

Name:	maa_MAAEquityAbstract
Namespace Prefix:	maa_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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