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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 | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Earnings Per Share Disclosure [Line Items] |  |  |  |
Income from Continuing Operations, Including Portion Attributable to Noncontrolling Interest |  | $ 264,015 | $ 366,618 | $ 231,022
Income from continuing operations attributable to noncontrolling interests |  | (9,053) | (12,807) | (8,123)
Income from continuing operations allocated to unvested restricted shares |  | (338) | (519) | (291)
Dividends, Preferred Stock, Cash |  | (3,688) | (3,688) | (3,688)
Income from continuing operations available for common shareholders, adjusted |  | $ 250,936 | $ 349,604 | $ 218,920
Weighted average common shares - basic |  | 114,188 | 113,854 | 113,638
Earnings per common share - basic |  | $ 2.20 | $ 3.07 | $ 1.93
Income from Continuing Operations, Including Portion Attributable to Noncontrolling Interest |  | $ 264,015 | $ 366,618 | $ 231,022
Income from continuing operations attributable to noncontrolling interests | [1] | 9,053 | 12,807 | 8,123
Net income available for MAA common shareholders, adjusted |  | $ 251,274 | $ 350,123 | $ 219,211
Effect of dilutive securities |  | 312 | 259 | 198
Weighted average common shares - diluted |  | 114,500 | 114,113 | 113,836
Net income available for MAA common shareholders |  | $ 2.19 | $ 3.07 | $ 1.93
Limited Partnership Units [Member] |  |  |  |
Earnings Per Share Disclosure [Line Items] |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount |  | 4,100 | 4,100 | 4,100
[1] | For the years ended December 31, 2020, 2019 and 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.

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