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Earnings Per Common Share of MAA Earnings Per Common Share of MAA (Details) - Parent Company [Member] - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Earnings Per Share Disclosure [Line Items]        
Weighted average common shares - basic 113,671 113,434 113,620 113,392
Weighted average partnership units outstanding [1] 0 0 0 0
Effect of dilutive securities 239 219 201 270
Weighted average common shares - diluted 113,910 113,653 113,821 113,662
Dividends, Preferred Stock, Cash     $ 2,766 $ 2,766
Calculation of Basic Earnings per Share [Member]        
Earnings Per Share Disclosure [Line Items]        
Income from continuing operations $ 54,704 $ 118,958 167,505 212,529
Income from continuing operations attributable to noncontrolling interests (1,913) (4,249) (5,888) (7,600)
Income from continuing operations allocated to unvested restricted shares (69) (181) (211) (337)
Dividends, Preferred Stock, Cash (922) (922) (2,766) (2,766)
Income from continuing operations available for common shareholders, adjusted $ 51,800 $ 113,606 $ 158,640 $ 201,826
Earnings per share - basic $ 0.46 $ 1.00 $ 1.40 $ 1.78
Calculation of Diluted Earnings per Share [Member]        
Earnings Per Share Disclosure [Line Items]        
Income from continuing operations $ 54,704 $ 118,958 $ 167,505 $ 212,529
Income from continuing operations attributable to noncontrolling interests [1] (1,913) (4,249) (5,888) (7,600)
Dividends, Preferred Stock, Cash (922) (922) (2,766) (2,766)
Adjusted Income (Loss) from Continuing Operations Available for Common Shareholders, Diluted $ 51,869 $ 113,787 $ 158,851 $ 202,163
Earnings per share - diluted $ 0.46 $ 1.00 $ 1.40 $ 1.78
Limited Partnership Units [Member]        
Earnings Per Share Disclosure [Line Items]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount     4,100 4,200
[1] (1) For the three and nine months ended September 30, 2018, 4.1 million OP Units and their related income are not included in the diluted earnings per share calculations as they are not dilutive. For the three and nine months ended September 30, 2017, 4.2 million OP Units and their related income are not included in the diluted earnings per share calculations as they are not dilutive.