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Earnings Per OP Unit of MAALP - Schedule of Diluted Earnings per Common Unit (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Earnings Per Share Disclosure [Line Items]    
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest $ 48,864 $ 37,952
Dividends, Preferred Stock, Cash (922) (922)
Income from continuing operations available for common shareholders, adjusted $ 46,217 $ 35,676
Earnings per share - basic $ 0.40 $ 0.31
Net income available for MAA common shareholders, adjusted $ 46,271 $ 35,726
Effect of dilutive securities 312,000 383,000
Weighted average common shares - diluted 114,575,000 114,494,000
Earnings per common share - diluted $ 0.40 $ 0.31
Limited Partner [Member]    
Earnings Per Share Disclosure [Line Items]    
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest $ 48,864 $ 37,952
Income from continuing operations allocated to unvested restricted shares (54) (50)
Dividends, Preferred Stock, Cash (922) (922)
Income from continuing operations available for common shareholders, adjusted $ 47,888 $ 36,980
Weighted average common units - basic 118,318 118,176
Earnings per share - basic $ 0.40 $ 0.31
Net income available for MAA common shareholders, adjusted $ 47,942 $ 37,030
Effect of dilutive securities 312 383
Weighted average common shares - diluted 118,630 118,559
Earnings per common share - diluted $ 0.40 $ 0.31