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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.

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- Definition Adjusted Income (Loss) from Continuing Operations Available for Common Shareholders, Basic + 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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- Definition Amount of paid and unpaid preferred stock dividends declared with the form of settlement in cash. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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