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Earnings Per OP Unit of MAALP (Tables) | 9 Months Ended
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Sep. 30, 2019
Earnings Per O P Unitof M A A L P [Abstract] |
Schedule of Diluted Earnings per Common Unit | For the three and nine months ended September 30, 2019 and 2018, MAA's diluted earnings per common unit was computed using the treasury stock method as presented below (dollars and units in thousands, except per unit amounts):
|  | Three months ended September 30, |  |  | Nine months ended September 30, |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Calculation of Earnings per Common Unit - basic |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 81,459 |  |  | $ | 54,704 |  |  | $ | 211,558 |  |  | $ | 167,505 |
Unvested restricted stock (allocation of earnings) |  |  | (118 | ) |  |  | (69 | ) |  |  | (302 | ) |  |  | (211 | )
Preferred unit distributions |  |  | (922 | ) |  |  | (922 | ) |  |  | (2,766 | ) |  |  | (2,766 | )
Net income available for common unitholders, adjusted |  | $ | 80,419 |  |  | $ | 53,713 |  |  | $ | 208,490 |  |  | $ | 164,528 |
Weighted average common units - basic |  |  | 117,958 |  |  |  | 117,796 |  |  |  | 117,910 |  |  |  | 117,768 |
Earnings per common unit - basic |  | $ | 0.68 |  |  | $ | 0.46 |  |  | $ | 1.77 |  |  | $ | 1.40 |
Calculation of Earnings per Common Unit - diluted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 81,459 |  |  | $ | 54,704 |  |  | $ | 211,558 |  |  | $ | 167,505 |
Preferred unit distributions |  |  | (922 | ) |  |  | (922 | ) |  |  | (2,766 | ) |  |  | (2,766 | )
Net income available for common unitholders, adjusted |  | $ | 80,537 |  |  | $ | 53,782 |  |  | $ | 208,792 |  |  | $ | 164,739 |
Weighted average common units - basic |  |  | 117,958 |  |  |  | 117,796 |  |  |  | 117,910 |  |  |  | 117,768 |
Effect of dilutive securities |  |  | 260 |  |  |  | 239 |  |  |  | 238 |  |  |  | 201 |
Weighted average common units - diluted |  |  | 118,218 |  |  |  | 118,035 |  |  |  | 118,148 |  |  |  | 117,969 |
Earnings per common unit - diluted |  | $ | 0.68 |  |  | $ | 0.46 |  |  | $ | 1.77 |  |  | $ | 1.40 |

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- Definition Earnings Per OP Unit of MAALP [Abstract] + References No definition available. + Details
Name: | maa_EarningsPerOPUnitofMAALPAbstract
Namespace Prefix: | maa_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Schedule of earnings per unit basic and diluted. + References No definition available. + Details
Name: | maa_ScheduleOfEarningsPerUnitBasicAndDilutedTableTextBlock
Namespace Prefix: | maa_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration