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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, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Dividends, Preferred Stock, Cash | $ (922) | $ (922) | $ (1,844) | $ (1,844)
Mid America Apartment Communities Inc Shareholders Equity |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning Balance | 6,215,565 | 6,325,299 | 6,289,459 | 6,372,189
Net Income Including Portion Attributable to Noncontrolling Interest | 77,728 | 64,141 | 115,680 | 130,099
Other comprehensive income (loss) - derivatives instruments (cash flow hedges) | 278 | (6,004) | 531 | (9,205)
Issuance and registration of common shares | (416) | (519) | (377) | 610
Shares repurchased and retired | (3,930) | (701) | (5,657) | (3,724)
Exercise of stock options |  | 1,032 | 71 | 1,240
Shares issued in exchange for redeemable stock |  | 575 |  | 575
Redeemable stock fair market value adjustment | (1,297) | (835) | 1,814 | (2,186)
Amortization of unearned compensation | 2,864 | 3,452 | 8,153 | 8,237
Dividends, Preferred Stock, Cash | (922) | (922) | (1,844) | (1,844)
Dividends on common stock | (114,435) | (109,557) | (228,737) | (218,949)
Dividends on noncontrolling interest units | (4,059) | (3,925) | (8,118) | (7,866)
Contribution from noncontrolling interest | 201 | 490 | 602 | 3,350
Ending Balance | 6,171,577 | 6,272,526 | 6,171,577 | 6,272,526
Preferred Stock [Member] | Mid America Apartment Communities Inc Shareholders Equity |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning Balance | 9 | 9 | 9 | 9
Ending Balance | 9 | 9 | 9 | 9
Common Stock [Member] | Mid America Apartment Communities Inc Shareholders Equity |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning Balance | 1,140 | 1,137 | 1,140 | 1,136
Issuance and registration of common shares |  | 1 |  | 2
Ending Balance | 1,140 | 1,138 | 1,140 | 1,138
Additional Paid-in Capital [Member] | Mid America Apartment Communities Inc Shareholders Equity |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning Balance | 7,170,148 | 7,141,544 | 7,166,073 | 7,138,170
Issuance and registration of common shares | (416) | (520) | (377) | 608
Shares repurchased and retired | (3,930) | (701) | (5,657) | (3,724)
Exercise of stock options |  | 1,032 | 71 | 1,240
Shares issued in exchange for units |  | 821 | 450 | 1,157
Shares issued in exchange for redeemable stock |  | 575 |  | 575
Adjustment for noncontrolling interests in Operating Partnership | 220 | (127) | 173 | (187)
Amortization of unearned compensation | 2,864 | 3,452 | 8,153 | 8,237
Ending Balance | 7,168,886 | 7,146,076 | 7,168,886 | 7,146,076
Accumulated Distributions in Excess of Net Income [Member] | Mid America Apartment Communities Inc Shareholders Equity |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning Balance | (1,160,944) | (1,037,268) | (1,085,479) | (989,263)
Net income attributable to MAA | 75,062 | 61,917 | 111,710 | 125,577
Redeemable stock fair market value adjustment | (1,297) | (835) | 1,814 | (2,186)
Dividends, Preferred Stock, Cash | (922) | (922) | (1,844) | (1,844)
Dividends on common stock | (114,435) | (109,557) | (228,737) | (218,949)
Ending Balance | (1,202,536) | (1,086,665) | (1,202,536) | (1,086,665)
Accumulated Other Comprehensive Income (Loss) [Member] | Mid America Apartment Communities Inc Shareholders Equity |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning Balance | (12,934) | (3,300) | (13,178) | (212)
Other comprehensive income (loss) - derivatives instruments (cash flow hedges) | 269 | (5,792) | 513 | (8,880)
Ending Balance | (12,665) | (9,092) | (12,665) | (9,092)
Noncontrolling Interest Operating Partnership | Mid America Apartment Communities Inc Shareholders Equity |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning Balance | 211,498 | 218,011 | 214,647 | 220,043
Net Income Attributable to Noncontrolling Interest | 2,666 | 2,224 | 3,970 | 4,522
Other comprehensive income (loss) - derivatives instruments (cash flow hedges) | 9 | (212) | 18 | (325)
Shares issued in exchange for units |  | (821) | (450) | (1,157)
Adjustment for noncontrolling interests in Operating Partnership | (220) | 127 | (173) | 187
Dividends on noncontrolling interest units | (4,059) | (3,925) | (8,118) | (7,866)
Ending Balance | 209,894 | 215,404 | 209,894 | 215,404
Noncontrolling Interest | Mid America Apartment Communities Inc Shareholders Equity |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning Balance | 6,648 | 5,166 | 6,247 | 2,306
Contribution from noncontrolling interest | 201 | 490 | 602 | 3,350
Ending Balance | $ 6,849 | $ 5,656 | $ 6,849 | $ 5,656

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