XML 41 R24.htm IDEA: XBRL DOCUMENT
v3.5.0.2

Earnings Per OP Unit of MAALP (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2016
Earnings Per OP Unit of MAALP [Abstract] |
Schedule of Earnings Per Unit, Basic and Diluted [Table Text Block] | Basic earnings per OP Unit is computed 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 OP unit. Diluted earnings per OP Unit reflects the potential dilution that could occur if securities or other contracts to issue OP Units were exercised or converted into OP Units. A reconciliation of the numerators and denominators of the basic and diluted earnings per OP Unit computations for the three and nine months ended September 30, 2016 and 2015 is presented below:
(dollars and units in thousands, except per unit amounts) | Three months ended September 30, |  | Nine months ended September 30, |
| 2016 |  | 2015 |  | 2016 |  | 2015 |
Units Outstanding |  |  |  |  |  |  |  |
Weighted average OP Units - basic | 79,449 |  |  | 79,374 |  |  | 79,432 |  |  | 79,356 |  |
Effect of dilutive securities | — |  | (1) | — |  | (1) | 246 |  |  | — |  | (1)
Weighted average OP Units - diluted | 79,449 |  |  | 79,374 |  |  | 79,678 |  |  | 79,356 |  |
Calculation of Earnings per Unit - basic |  |  |  |  |  |  |  |  |  |
Income from continuing operations | $ | 88,906 |  |  | $ | 96,828 |  |  | $ | 182,344 |  |  | $ | 305,378 |  |
Income from continuing operations allocated to unvested restricted common units | (254 | ) |  | (221 | ) |  | (484 | ) |  | (668 | ) |
Income from continuing operations available for common unitholders, adjusted | $ | 88,652 |  |  | $ | 96,607 |  |  | $ | 181,860 |  |  | $ | 304,710 |  |
Weighted average OP Units - basic | 79,449 |  |  | 79,374 |  |  | 79,432 |  |  | 79,356 |  |
Earnings per OP Unit - basic | $ | 1.12 |  |  | $ | 1.22 |  |  | $ | 2.29 |  |  | $ | 3.84 |  |
Calculation of Earnings per Unit - diluted |  |  |  |  |  |  |  |  |  |
Income from continuing operations | $ | 88,906 |  |  | $ | 96,828 |  |  | $ | 182,344 |  |  | $ | 305,378 |  |
Income from continuing operations allocated to unvested restricted common units | (254 | ) | (1) | (221 | ) | (1) | — |  |  | (668 | ) | (1)
Income from continuing operations available for common unitholders, adjusted | $ | 88,652 |  |  | $ | 96,607 |  |  | $ | 182,344 |  |  | $ | 304,710 |  |
Weighted average OP Units - diluted | 79,449 |  |  | 79,374 |  |  | 79,678 |  |  | 79,356 |  |
Earnings per OP Unit - diluted | $ | 1.12 |  |  | $ | 1.22 |  |  | $ | 2.29 |  |  | $ | 3.84 |  |
(1) For the three months ended September 30, 2016 and for both the three and nine months ended September 30, 2015, 0.2 million potentially dilutive securities and their related income are not included in the diluted earnings per unit calculations as they are not dilutive.

X
- 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

X
- 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