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Earnings Per Common Share of MAA - Schedule of Computation of Diluted Earnings per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Earnings Per Share Disclosure [Line Items]        
Income from Continuing Operations, Including Portion Attributable to Noncontrolling Interest $ 223,875 $ 77,728 $ 272,739 $ 115,680
Income from continuing operations attributable to noncontrolling interests (7,397) (2,666) (9,068) (3,970)
Income from continuing operations allocated to unvested restricted shares (234) (100) (294) (151)
Dividends, Preferred Stock, Cash (922) (922) (1,844) (1,844)
Income from continuing operations available for common shareholders, adjusted $ 215,322 $ 74,040 $ 261,533 $ 109,715
Weighted average common shares - basic 114,494 114,204 114,379 114,158
Earnings per share - basic $ 1.88 $ 0.65 $ 2.29 $ 0.96
Income from Continuing Operations, Including Portion Attributable to Noncontrolling Interest $ 223,875 $ 77,728 $ 272,739 $ 115,680
Income from continuing operations attributable to noncontrolling interests [1] (7,397) (2,666) (9,068) (3,970)
Net income available for MAA common shareholders, adjusted $ 215,556 $ 74,140 $ 261,827 $ 109,866
Effect of dilutive securities 318 234 311 324
Weighted average common shares - diluted 114,812 114,438 114,690 114,482
Earnings per common share - diluted $ 1.88 $ 0.65 $ 2.28 $ 0.96
Limited Partnership Units [Member]        
Earnings Per Share Disclosure [Line Items]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 3,900 4,100 4,000 4,100
[1] For the three and six months ended June 30, 2021 3.9 million OP Units and 4.0 million OP Units, respectively, and their related income are not included in the diluted earnings per share calculations as they are not dilutive.  For the three and six months ended June 30, 2020, 4.1 million OP Units and their related income are not included in the diluted earnings per share calculations as they are not dilutive.