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Earnings Per OP Unit of MAALP | 9 Months Ended
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Sep. 30, 2019
Earnings Per O P Unitof M A A L P [Abstract] |
Earnings per OP Unit of MAALP | 3.Earnings per OP Unit of MAALP Basic earnings per common unit is computed using the two-class method by dividing net income available for common unitholders by the weighted average number of OP Units outstanding during the period. All outstanding unvested restricted unit awards contain rights to non-forfeitable distributions and participate in undistributed earnings with common unitholders and, accordingly, are considered participating securities that are included in the two-class method of computing basic earnings per common unit. Diluted earnings per common unit reflects the potential dilution that could occur if securities or other contracts to issue OP Units were exercised or converted into OP Units. Both the unvested restricted unit awards and other potentially dilutive common units, and the related impact to earnings, are considered when calculating earnings per common unit on a diluted basis with diluted earnings per common unit being the more dilutive of the treasury stock or two-class methods. 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
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Namespace Prefix: | maa_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Earnings Per Unit [Text Block] + References No definition available. + Details
Name: | maa_EarningsPerUnitTextBlock
Namespace Prefix: | maa_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration