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Shareholders' Equity of MAA - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018 | Dec. 01, 2016
Preferred Stock, Liquidation Preference Per Share | $ 50.00 |  |  |
Preferred Stock, Redemption Date | Oct. 01, 2026 |  |  |
Preferred Stock, Redemption Price Per Share | $ 50.00 |  |  |
Common stock, shares outstanding | 113,916,208 | 113,745,207 |  |
Total common shares and operating partnership units outstanding | 118,021,379 | 117,886,987 |  |
Preferred Stock, Dividend Rate, Percentage | 8.50% |  |  |
Preferred Stock, Dividend Rate, Per-Dollar-Amount | $ 4.25 |  |  |
Preferred Stock, Liquidation Preference, Value | $ 43.4 |  |  |
Equity Option [Member] |  |  |  |
Stock Issued During Period, Shares, New Issues | 2,827 | 12,600 |  |
Noncontrolling Interest [Member] |  |  |  |
Common Shares Issuable Upon Conversion Of Convertible Stock | 4,105,171 | 4,141,780 |  |
Parent Company [Member] |  |  |  |
Preferred Stock, Shares Outstanding | 867,846 |  | 867,846 |
Preferred Stock, Liquidation Preference Per Share | $ 50 |  | $ 50 |
Common stock, shares outstanding | 113,916,208 |  | 113,844,267 |
Proceeds from Stock Options Exercised | $ 0.2 | $ 0.6 |  |
Employee Stock Option [Member] |  |  |  |
Common stock shares, outstanding option | 87,788 | 95,838 |  |
Redeemable Preferred Stock [Member] |  |  |  |
Preferred Stock, Shares Outstanding |  |  |  | 867,846

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