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MAA Equity - Summary of Changes in Total Equity and its Components (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning Balance | $ 6,325,299 | $ 6,520,363 | $ 6,372,189 | $ 6,573,894
Net Income Including Portion Attributable to Noncontrolling Interest | 64,141 | 61,981 | 130,099 | 112,801
Other comprehensive (loss) income - derivatives instruments (cash flow hedges) | (6,004) | 5,165 | (9,205) | 5,804
Issuance and registration of common shares | (519) | (341) | 610 | (236)
Shares repurchased and retired | (701) |  | (3,724) | (2,912)
Exercise of stock options | 1,032 |  | 1,240 | 625
Shares issued in exchange for redeemable stock | 575 |  | 575 | 1,915
Redeemable stock fair market value | (835) | (892) | (2,186) | 73
Adjustment for noncontrolling interests in Operating Partnership | 490 |  | 3,350 |
Amortization of unearned compensation | 3,452 | 2,963 | 8,237 | 6,987
Dividends, Preferred Stock, Cash | (922) | (922) | (1,844) | (1,844)
Dividends on common stock | (109,557) | (105,023) | (218,949) | (209,994)
Dividends on noncontrolling interest units | (3,925) | (3,814) | (7,866) | (7,633)
Contribution from noncontrolling interest | 490 |  | 3,350 |
Ending Balance | 6,272,526 | 6,479,480 | 6,272,526 | 6,479,480
Preferred Stock [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning Balance | 9 | 9 | 9 | 9
Ending Balance | 9 | 9 | 9 | 9
Common Stock [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning Balance | 1,137 | 1,135 | 1,136 | 1,134
Issuance and registration of common shares | 1 |  | 2 | 1
Shares issued in exchange for units |  | 1 |  | 1
Ending Balance | 1,138 | 1,136 | 1,138 | 1,136
Additional Paid-in Capital [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning Balance | 7,141,544 | 7,127,740 | 7,138,170 | 7,121,112
Issuance and registration of common shares | (520) | (341) | 608 | (237)
Shares repurchased and retired | (701) |  | (3,724) | (2,912)
Exercise of stock options | 1,032 |  | 1,240 | 625
Shares issued in exchange for units | 821 | 337 | 1,157 | 3,117
Shares issued in exchange for redeemable stock | 575 |  | 575 | 1,915
Adjustment for noncontrolling interests in Operating Partnership | (127) | 203 | (187) | 295
Amortization of unearned compensation | 3,452 | 2,963 | 8,237 | 6,987
Ending Balance | 7,146,076 | 7,130,902 | 7,146,076 | 7,130,902
Accumulated Distributions in Excess of Net Income [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning Balance | (1,037,268) | (840,642) | (989,263) | (784,500)
Net income attributable to MAA | 61,917 | 59,807 | 125,577 | 108,826
Redeemable stock fair market value | (835) | (892) | (2,186) | 73
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification |  |  |  | (233)
Dividends, Preferred Stock, Cash | (922) | (922) | (1,844) | (1,844)
Dividends on common stock | (109,557) | (105,023) | (218,949) | (209,994)
Ending Balance | (1,086,665) | (887,672) | (1,086,665) | (887,672)
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning Balance | (3,300) | 3,000 | (212) | 2,157
Other comprehensive (loss) income - derivatives instruments (cash flow hedges) | (5,792) | 4,986 | (8,880) | 5,596
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification |  |  |  | 233
Ending Balance | (9,092) | 7,986 | (9,092) | 7,986
Noncontrolling Interest |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning Balance | 5,166 | 2,306 | 2,306 | 2,306
Adjustment for noncontrolling interests in Operating Partnership | 490 |  | 3,350 |
Contribution from noncontrolling interest | 490 |  | 3,350 |
Ending Balance | 5,656 | 2,306 | 5,656 | 2,306
General Partner |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning Balance | 218,011 | 226,815 | 220,043 | 231,676
Net Income Attributable to Noncontrolling Interest | 2,224 | 2,174 | 4,522 | 3,975
Other comprehensive (loss) income - derivatives instruments (cash flow hedges) | (212) | 179 | (325) | 208
Shares issued in exchange for units | (821) | (338) | (1,157) | (3,118)
Adjustment for noncontrolling interests in Operating Partnership | 127 | (203) | 187 | (295)
Dividends on noncontrolling interest units | (3,925) | (3,814) | (7,866) | (7,633)
Ending Balance | $ 215,404 | $ 224,813 | $ 215,404 | $ 224,813

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