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Shareholders' Equity of MAA - Additional Information (Detail) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Statement [Line Items] |  |  |
Common stock, shares outstanding | 75,542,583 | 75,379,381 |
Total common shares and operating partnership units outstanding | 79,685,786 | 79,564,446 |
Treasury Stock, Shares, Acquired | 19,727 | 11,914 |
Noncontrolling Interest [Member] |  |  |
Statement [Line Items] |  |  |
Common Shares Issuable Upon Conversion Of Convertible Stock | 4,143,203 | 4,185,065 |
Parent Company [Member] |  |  |
Statement [Line Items] |  |  |
Common stock, shares outstanding | 75,542,583 |  | 75,408,571
Proceeds from Stock Options Exercised | $ 0 | $ 420 |
Employee Stock Option [Member] |  |  |
Statement [Line Items] |  |  |
Common stock shares, outstanding option | 39,084 | 58,112 |
Equity Option [Member] |  |  |
Statement [Line Items] |  |  |
Stock Issued During Period, Shares, New Issues | 0 | 7,342 |

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