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Earnings Per OP Unit of MAALP (Tables) | 3 Months Ended
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Mar. 31, 2019
Earnings Per OP Unit of MAALP [Abstract] |
Schedule of Earnings Per Unit, Basic and Diluted [Table Text Block] | For the three months ended March 31, 2019 and 2018, MAA's diluted earnings per common unit was computed using the treasury stock method and the two-class method, respectively, as presented below (dollars and units in thousands, except per unit amounts):
| Three months ended March 31,
| 2019 |  | 2018
Calculation of Earnings per Common Unit - basic |  |  |
Net income | $ | 65,958 |  |  | $ | 50,820 |
Unvested restricted stock (allocation of earnings) | (87 | ) |  | (79 | )
Preferred unit distributions | (922 | ) |  | (922 | )
Net income available for common unitholders, adjusted | $ | 64,949 |  |  | $ | 49,819 |
Weighted average common units - basic | 117,837 |  |  | 117,689 |
Earnings per common unit - basic | $ | 0.55 |  |  | $ | 0.42 |
Calculation of Earnings per Common Unit - diluted |  |  |
Net income | $ | 65,958 |  |  | $ | 50,820 |
Unvested restricted stock (allocation of earnings) (1) | — |  |  | (79 | )
Preferred unit distributions | (922 | ) |  | (922 | )
Net income available for common unitholders, adjusted | $ | 65,036 |  |  | $ | 49,819 |
Weighted average common units - basic | 117,837 |  |  | 117,689 |
Effect of dilutive securities (1) | 207 |  |  | — |
Weighted average common units - diluted | 118,044 |  |  | 117,689 |
Earnings per common unit - diluted | $ | 0.55 |  |  | $ | 0.42 |
(1) For the three months ended March 31, 2018, 0.2 million potentially dilutive securities and their related income are not included in the diluted earnings per share calculation as they are not dilutive.

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