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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Earnings Per Share Disclosure [Line Items] |  |  |  |  |
Income from Continuing Operations, Including Portion Attributable to Noncontrolling Interest |  | $ 81,459 | $ 54,704 | $ 211,558 | $ 167,505
Income from continuing operations attributable to noncontrolling interests |  | (2,814) | (1,913) | (7,336) | (5,888)
Income from continuing operations allocated to unvested restricted shares |  | (118) | (69) | (302) | (211)
Dividends, Preferred Stock, Cash |  | (922) | (922) | (2,766) | (2,766)
Income from continuing operations available for common shareholders, adjusted |  | $ 77,605 | $ 51,800 | $ 201,154 | $ 158,640
Weighted average common shares - basic |  | 113,877 | 113,671 | 113,814 | 113,620
Earnings per share - basic |  | $ 0.68 | $ 0.46 | $ 1.77 | $ 1.40
Income from Continuing Operations, Including Portion Attributable to Noncontrolling Interest |  | $ 81,459 | $ 54,704 | $ 211,558 | $ 167,505
Income from continuing operations attributable to noncontrolling interests | [1] | (2,814) | (1,913) | (7,336) | (5,888)
Adjusted Income (Loss) from Continuing Operations Available for Common Shareholders, Diluted |  | $ 77,723 | $ 51,869 | $ 201,456 | $ 158,851
Effect of dilutive securities |  | 260 | 239 | 238 | 201
Weighted average common shares - diluted |  | 114,137 | 113,910 | 114,052 | 113,821
Earnings per share - diluted |  | $ 0.68 | $ 0.46 | $ 1.77 | $ 1.40
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 | 4,100
[1] | For the three and nine months ended September 30, 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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- Definition Adjusted income (loss) from continuing operations available for common shareholders, diluted. + References No definition available. + Details
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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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