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Earnings Per OP Unit of MAALP (Tables) | 12 Months Ended
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Dec. 31, 2016
Earnings Per Unit [Abstract] |
Schedule of Calculation of Numerator and Denominator in Earnings Per Unit [Table Text Block] | A reconciliation of the numerators and denominators of the basic and diluted earnings per OP unit computations for the years ended December 31, 2016, 2015, and 2014 is presented below:
(dollars and units in thousands, except per unit amounts) | Years ended December 31, |
| 2016 |  | 2015 |  | 2014 |
Units Outstanding |  |  |  |  |  |
Weighted average common units - basic | 82,661 |  |  | 79,361 |  |  | 79,188 |  |
Effect of dilutive securities | 298 |  |  | — |  | (1) | — |  | (1)
Weighted average common units - diluted | 82,959 |  |  | 79,361 |  |  | 79,188 |  |
Calculation of Earnings per Unit - basic |  |  |  |  |  |  |  |  |
Income from continuing operations | $ | 224,402 |  |  | $ | 350,745 |  |  | $ | 150,946 |  |
Income from continuing operations allocated to unvested restricted shares | (574 | ) |  | (772 | ) |  | (278 | ) |
Preferred unit distributions | (307 | ) |  | — |  |  | — |  |
Income from continuing operations available for common unitholders, adjusted | $ | 223,521 |  |  | $ | 349,973 |  |  | $ | 150,668 |  |
Income from discontinued operations | $ | — |  |  | $ | — |  |  | $ | 5,331 |  |
Income from discontinued operations allocated to unvested restricted shares | — |  |  | — |  |  | (10 | ) |
Income from discontinued operations available for common unitholders, adjusted | $ | — |  |  | $ | — |  |  | $ | 5,321 |  |
Weighted average common units - basic | 82,661 |  |  | 79,361 |  |  | 79,188 |  |
Earnings per unit - basic: | $ | 2.70 |  |  | $ | 4.41 |  |  | $ | 1.97 |  |
Calculation of Earnings per Unit - diluted |  |  |  |  |  |  |  |  |
Income from continuing operations | $ | 224,402 |  |  | $ | 350,745 |  |  | $ | 150,946 |  |
Income from continuing operations allocated to unvested restricted shares | — |  |  | (772 | ) | (1) | (278 | ) | (1)
Preferred unit distributions | (307 | ) |  | — |  |  | — |  |
Income from continuing operations available for common unitholders, adjusted | $ | 224,095 |  |  | $ | 349,973 |  |  | $ | 150,668 |  |
Income from discontinued operations | $ | — |  |  | $ | — |  |  | $ | 5,331 |  |
Income from discontinued operations allocated to unvested restricted shares | — |  |  | — |  |  | (10 | ) | (1)
Income from discontinued operations available for common unitholders, adjusted | $ | — |  |  | $ | — |  |  | $ | 5,321 |  |
Weighted average common units - diluted | 82,959 |  |  | 79,361 |  |  | 79,188 |  |
Earnings per unit - diluted: | $ | 2.70 |  |  | $ | 4.41 |  |  | $ | 1.97 |  |
(1) For both the years ended December 31, 2015 and 2014, 0.1 million potentially dilutive securities and their related income are not included in the diluted earnings per unit calculations as they are not dilutive.

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- Definition Schedule of Earnings Per Unit, Basic and Diluted [Table Text Block] + References No definition available. + Details
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Namespace Prefix: | maa_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration