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Earnings Per Common Share of MAA (Tables) | 12 Months Ended
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Dec. 31, 2018
Earnings per share of the trust [Abstract] |
Schedule of Calculation of Numerator and Denominator in Earnings Per Share [Table Text Block] | For the years ended December 31, 2018, 2017 and 2016, MAA's basic earnings per share was computed using the two-class method and MAA's diluted earnings per share was computed using the more dilutive of the treasury stock method or the two-class method as presented below (dollars and shares in thousands, except per share amounts):
| 2018 |  | 2017 |  | 2016 |
Calculation of Earnings per common share - basic |  |  |  |  |  |  |  |  |
Net income | $ | 231,022 |  |  | $ | 340,536 |  |  | $ | 224,402 |  |
Net income attributable to noncontrolling interests | (8,123 | ) |  | (12,157 | ) |  | (12,180 | ) |
Unvested restricted stock (allocation of earnings) | (291 | ) |  | (535 | ) |  | (572 | ) |
Preferred dividends | (3,688 | ) |  | (3,688 | ) |  | (307 | ) |
Net income available for common shareholders, adjusted | $ | 218,920 |  |  | $ | 324,156 |  |  | $ | 211,343 |  |
Weighted average common shares - basic | 113,638 |  |  | 113,407 |  |  | 78,502 |  |
Earnings per common share - basic | $ | 1.93 |  |  | $ | 2.86 |  |  | $ | 2.69 |  |
Calculation of Earnings per common share - diluted |  |  |  |  |  |  |  |  |
Net income | $ | 231,022 |  |  | $ | 340,536 |  |  | $ | 224,402 |  |
Net income attributable to noncontrolling interests | (8,123 | ) | (1) | (12,157 | ) | (1) | (12,180 | ) | (1)
Preferred dividends | (3,688 | ) |  | (3,688 | ) |  | (307 | ) |
Net income available for common shareholders, adjusted | $ | 219,211 |  |  | $ | 324,691 |  |  | $ | 211,915 |  |
Weighted average common shares - basic | 113,638 |  |  | 113,407 |  |  | 78,502 |  |
Effect of dilutive securities | 198 |  |  | 280 |  |  | 298 |  |
Weighted average common shares - diluted | 113,836 |  |  | 113,687 |  |  | 78,800 |  |
Earnings per common share - diluted | $ | 1.93 |  |  | $ | 2.86 |  |  | $ | 2.69 |  |
(1) For the years ended December 31, 2018, 2017 and 2016, 4.1 million, 4.2 million and 4.2 million OP Units and their related income, respectively, are not included in the diluted earnings per share calculations as they are not dilutive.

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- Definition Earnings per share of the trust [Abstract] + References No definition available. + Details
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Namespace Prefix: | maa_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + 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 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration