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MAA Equity - Summary of Changes in Total Equity and its Components (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Dividends, Preferred Stock, Cash | $ (922) | $ (922) | $ (2,766) | $ (2,766)
Mid America Apartment Communities Inc Shareholders Equity |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning Balance | 6,171,577 | 6,272,526 | 6,289,459 | 6,372,189
Net Income Including Portion Attributable to Noncontrolling Interest | 62,036 | 81,459 | 177,716 | 211,558
Other comprehensive income (loss) - derivatives instruments (cash flow hedges) | 279 | (5,973) | 810 | (15,178)
Issuance and registration of common shares | 33 | 140 | (344) | 750
Shares repurchased and retired |  |  | (5,657) | (3,724)
Exercise of stock options |  | (204) | 71 | 1,036
Shares issued in exchange for redeemable stock |  |  |  | 575
Redeemable stock fair market value adjustment | (155) | (1,269) | 1,659 | (3,455)
Amortization of unearned compensation | 4,380 | 3,313 | 12,533 | 11,550
Dividends, Preferred Stock, Cash | (922) | (922) | (2,766) | (2,766)
Dividends on common stock | (114,369) | (109,503) | (343,106) | (328,452)
Dividends on noncontrolling interest units | (3,866) | (3,912) | (11,984) | (11,778)
Contribution from noncontrolling interest | 262 | 955 | 864 | 4,305
Ending Balance | 6,119,255 | 6,236,610 | 6,119,255 | 6,236,610
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 | 1,138 | 1,140 | 1,136
Issuance and registration of common shares |  |  |  | 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 | 7,168,886 | 7,146,076 | 7,166,073 | 7,138,170
Issuance and registration of common shares | 33 | 140 | (344) | 748
Shares repurchased and retired |  |  | (5,657) | (3,724)
Exercise of stock options |  | (204) | 71 | 1,036
Shares issued in exchange for common units | 21 | 836 | 471 | 1,993
Shares issued in exchange for redeemable stock |  |  |  | 575
Adjustment for noncontrolling interests in Operating Partnership | 71 | (272) | 244 | (459)
Amortization of unearned compensation | 4,380 | 3,313 | 12,533 | 11,550
Ending Balance | 7,173,391 | 7,149,889 | 7,173,391 | 7,149,889
Accumulated Distributions in Excess of Net Income [Member] | Mid America Apartment Communities Inc Shareholders Equity |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning Balance | (1,202,536) | (1,086,665) | (1,085,479) | (989,263)
Net income attributable to MAA | 59,910 | 78,645 | 171,620 | 204,222
Redeemable stock fair market value adjustment | (155) | (1,269) | 1,659 | (3,455)
Dividends, Preferred Stock, Cash | (922) | (922) | (2,766) | (2,766)
Dividends on common stock | (114,369) | (109,503) | (343,106) | (328,452)
Ending Balance | (1,258,072) | (1,119,714) | (1,258,072) | (1,119,714)
Accumulated Other Comprehensive Income (Loss) [Member] | Mid America Apartment Communities Inc Shareholders Equity |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning Balance | (12,665) | (9,092) | (13,178) | (212)
Other comprehensive income (loss) - derivatives instruments (cash flow hedges) | 269 | (5,778) | 782 | (14,658)
Ending Balance | (12,396) | (14,870) | (12,396) | (14,870)
Noncontrolling Interest Operating Partnership | Mid America Apartment Communities Inc Shareholders Equity |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning Balance | 209,894 | 215,404 | 214,647 | 220,043
Net Income Attributable to Noncontrolling Interest | 2,126 | 2,814 | 6,096 | 7,336
Other comprehensive income (loss) - derivatives instruments (cash flow hedges) | 10 | (195) | 28 | (520)
Shares issued in exchange for common units | (21) | (836) | (471) | (1,993)
Adjustment for noncontrolling interests in Operating Partnership | (71) | 272 | (244) | 459
Dividends on noncontrolling interest units | (3,866) | (3,912) | (11,984) | (11,778)
Ending Balance | 208,072 | 213,547 | 208,072 | 213,547
Noncontrolling Interest | Mid America Apartment Communities Inc Shareholders Equity |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning Balance | 6,849 | 5,656 | 6,247 | 2,306
Contribution from noncontrolling interest | 262 | 955 | 864 | 4,305
Ending Balance | $ 7,111 | $ 6,611 | $ 7,111 | $ 6,611

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