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Earnings Per OP Unit of MAALP (Tables) | 12 Months Ended
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Dec. 31, 2018
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 common unit computations for the years ended December 31, 2018, 2017 and 2016 is presented below (dollars and units in thousands, except per unit amounts):
| 2018 |  | 2017 |  | 2016 |
Calculation of Earnings per common unit - basic |  |  |  |  |  |  |  |  |
Net income | $ | 231,022 |  |  | $ | 340,536 |  |  | $ | 224,402 |  |
Unvested restricted stock (allocation of earnings) | (291 | ) |  | (535 | ) |  | (574 | ) |
Preferred unit distributions | (3,688 | ) |  | (3,688 | ) |  | (307 | ) |
Net income available for common unitholders, adjusted | $ | 227,043 |  |  | $ | 336,313 |  |  | $ | 223,521 |  |
Weighted average common units - basic | 117,777 |  |  | 117,617 |  |  | 82,661 |  |
Earnings per common unit - basic | $ | 1.93 |  |  | $ | 2.86 |  |  | $ | 2.70 |  |
Calculation of Earnings per common unit - diluted |  |  |  |  |  |  |  |  |
Net income | $ | 231,022 |  |  | $ | 340,536 |  |  | $ | 224,402 |  |
Preferred unit distributions | (3,688 | ) |  | (3,688 | ) |  | (307 | ) |
Net income available for common unitholders, adjusted | $ | 227,334 |  |  | $ | 336,848 |  |  | $ | 224,095 |  |
Weighted average common units - basic | 117,777 |  |  | 117,617 |  |  | 82,661 |  |
Effect of dilutive securities | 198 |  |  | 280 |  |  | 298 |  |
Weighted average common units - diluted | 117,975 |  |  | 117,897 |  |  | 82,959 |  |
Earnings per common unit - diluted | $ | 1.93 |  |  | $ | 2.86 |  |  | $ | 2.70 |  |

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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