Shareholders' Equity of MAA - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended		6 Months Ended
	Aug. 31, 2021	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Equity [Line Items]
Common stock, shares outstanding		115,438,832	114,919,922	115,438,832	114,919,922	115,336,876
Total common shares and operating partnership units outstanding		118,641,209	118,538,877	118,641,209	118,538,877
Proceeds from Stock Options Exercised, Net					$ 1.5
Equity Forward Sale Agreements [Member]
Equity [Line Items]
Stock Issued During Period, Shares, New Issues	1,100,000
Common stock, price per share	$ 190.56
Common stock settlement under agreement	0
Common shares attributable to dilutive effect of equity forward agreements				62,000
At The Market Offering [Member]
Equity [Line Items]
Common stock shares sold		0	0	0	0
Remaining common stock to be issued				4,000,000.0
Maximum [Member] | At The Market Offering [Member]
Equity [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized		4,000,000.0		4,000,000.0
Equity Option [Member]
Equity [Line Items]
Stock Issued During Period, Shares, New Issues				350	18,882
Noncontrolling Interest [Member]
Equity [Line Items]
Common Shares Issuable Upon Conversion Of Convertible Stock		3,202,377	3,618,955	3,202,377	3,618,955
Employee Stock Option [Member]
Equity [Line Items]
Common stock shares, outstanding option		463	963	463	963