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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, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
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 | 6,272,526 | 6,479,480 | 6,372,189 | 6,573,894
Net Income Including Portion Attributable to Noncontrolling Interest | 81,459 | 54,704 | 211,558 | 167,505
Other comprehensive (loss) income - derivatives instruments (cash flow hedges) | (5,973) | 3,697 | (15,178) | 9,501
Issuance and registration of common shares | 140 | (35) | 750 | (271)
Shares repurchased and retired |  |  | (3,724) | (2,912)
Exercise of stock options | (204) | 291 | 1,036 | 916
Shares issued in exchange for redeemable stock |  |  | 575 | 1,915
Redeemable stock fair market value adjustment | (1,269) | 48 | (3,455) | 121
Amortization of unearned compensation | 3,313 | 2,890 | 11,550 | 9,877
Dividends, Preferred Stock, Cash | (922) | (922) | (2,766) | (2,766)
Dividends on common stock | (109,503) | (105,018) | (328,452) | (315,012)
Dividends on noncontrolling interest units | (3,912) | (3,581) | (11,778) | (11,214)
Contribution from noncontrolling interest | 955 |  | 4,305 |
Ending Balance | 6,236,610 | 6,431,554 | 6,236,610 | 6,431,554
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 | 1,138 | 1,136 | 1,136 | 1,134
Issuance and registration of common shares |  |  | 2 | 1
Shares issued in exchange for units |  |  |  | 1
Ending Balance | 1,138 | 1,136 | 1,138 | 1,136
Additional Paid-in Capital [Member] | Mid America Apartment Communities Inc Shareholders Equity |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning Balance | 7,146,076 | 7,130,902 | 7,138,170 | 7,121,112
Issuance and registration of common shares | 140 | (35) | 748 | (272)
Shares repurchased and retired |  |  | (3,724) | (2,912)
Exercise of stock options | (204) | 291 | 1,036 | 916
Shares issued in exchange for units | 836 |  | 1,993 | 4,282
Shares issued in exchange for redeemable stock |  | 1,165 | 575 | 1,915
Adjustment for noncontrolling interests in Operating Partnership | (272) | 266 | (459) | 561
Amortization of unearned compensation | 3,313 | 2,890 | 11,550 | 9,877
Ending Balance | 7,149,889 | 7,135,479 | 7,149,889 | 7,135,479
Accumulated Distributions in Excess of Net Income [Member] | Mid America Apartment Communities Inc Shareholders Equity |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning Balance | (1,086,665) | (887,672) | (989,263) | (784,500)
Net income attributable to MAA | 78,645 | 52,791 | 204,222 | 161,617
Redeemable stock fair market value adjustment | (1,269) | 48 | (3,455) | 121
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification |  |  |  | (233)
Dividends, Preferred Stock, Cash | (922) | (922) | (2,766) | (2,766)
Dividends on common stock | (109,503) | (105,018) | (328,452) | (315,012)
Ending Balance | (1,119,714) | (940,773) | (1,119,714) | (940,773)
Accumulated Other Comprehensive Income (Loss) [Member] | Mid America Apartment Communities Inc Shareholders Equity |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning Balance | (9,092) | 7,986 | (212) | 2,157
Other comprehensive (loss) income - derivatives instruments (cash flow hedges) | (5,778) | 3,570 | (14,658) | 9,166
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification |  |  |  | 233
Ending Balance | (14,870) | 11,556 | (14,870) | 11,556
Noncontrolling Interest Operating Partnership | Mid America Apartment Communities Inc Shareholders Equity |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning Balance | 215,404 | 224,813 | 220,043 | 231,676
Net Income Attributable to Noncontrolling Interest | 2,814 | 1,913 | 7,336 | 5,888
Other comprehensive (loss) income - derivatives instruments (cash flow hedges) | (195) | 127 | (520) | 335
Shares issued in exchange for units | (836) |  | (1,993) | (4,283)
Shares issued in exchange for redeemable stock |  | (1,165) |  |
Adjustment for noncontrolling interests in Operating Partnership | 272 | (266) | 459 | (561)
Dividends on noncontrolling interest units | (3,912) | (3,581) | (11,778) | (11,214)
Ending Balance | 213,547 | 221,841 | 213,547 | 221,841
Noncontrolling Interest | Mid America Apartment Communities Inc Shareholders Equity |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning Balance | 5,656 | 2,306 | 2,306 | 2,306
Contribution from noncontrolling interest | 955 |  | 4,305 |
Ending Balance | $ 6,611 | $ 2,306 | $ 6,611 | $ 2,306

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