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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, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Dividends on preferred stock | $ (922) | $ (922) | $ (2,766) | $ (2,766)
Mid America Apartment Communities Inc. Shareholders Equity [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning Balance | 6,120,667 | 6,171,577 | 6,088,408 | 6,289,459
Net Income Including Portion Attributable to Noncontrolling Interest | 87,047 | 62,036 | 359,786 | 177,716
Other comprehensive income - derivative instruments | (278) | 279 | 835 | 810
Issuance and registration of common shares | (103) | 33 | (436) | (344)
Shares repurchased and retired |  |  | (9,043) | (5,657)
Exercise of stock options | 12 |  | 1,478 | 71
Redeemable stock fair market value adjustment | (2,356) | (155) | (7,545) | 1,659
Amortization of unearned compensation | 4,007 | 4,380 | 14,151 | 12,533
Dividends on preferred stock | (922) | (922) | (2,766) | (2,766)
Dividends on common stock | (118,018) | (114,369) | (353,168) | (343,106)
Dividends on noncontrolling interest units | (3,486) | (3,866) | (11,338) | (11,984)
Contribution from noncontrolling interest | 3,204 | 262 | 9,968 | 864
Ending Balance | 6,090,330 | 6,119,255 | 6,090,330 | 6,119,255
Mid America Apartment Communities Inc. Shareholders Equity [Member] | Preferred Stock [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning Balance | 9 | 9 | 9 | 9
Ending Balance | 9 | 9 | 9 | 9
Mid America Apartment Communities Inc. Shareholders Equity [Member] | Common Stock [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning Balance | 1,147 | 1,140 | 1,141 | 1,140
Issuance and registration of common shares |  |  | 2 |
Shares issued in exchange for common units | 2 |  | 6 |
Ending Balance | 1,149 | 1,140 | 1,149 | 1,140
Mid America Apartment Communities Inc. Shareholders Equity [Member] | Additional Paid-in Capital [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning Balance | 7,201,885 | 7,168,886 | 7,176,793 | 7,166,073
Issuance and registration of common shares | (103) | 33 | (438) | (344)
Shares repurchased and retired |  |  | (9,043) | (5,657)
Exercise of stock options | 12 |  | 1,478 | 71
Shares issued in exchange for common units | 11,106 | 21 | 33,266 | 471
Adjustment for noncontrolling interests in Operating Partnership | 22 | 71 | 678 | 244
Amortization of unearned compensation | 4,007 | 4,380 | 14,151 | 12,533
Ending Balance | 7,216,885 | 7,173,391 | 7,216,885 | 7,173,391
Mid America Apartment Communities Inc. Shareholders Equity [Member] | Accumulated Distributions in Excess of Net Income [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning Balance | (1,272,694) | (1,202,536) | (1,294,182) | (1,085,479)
Net income attributable to MAA | 84,479 | 59,910 | 348,150 | 171,620
Redeemable stock fair market value adjustment | (2,356) | (155) | (7,545) | 1,659
Dividends on preferred stock | (922) | (922) | (2,766) | (2,766)
Dividends on common stock | (118,018) | (114,369) | (353,168) | (343,106)
Ending Balance | (1,309,511) | (1,258,072) | (1,309,511) | (1,258,072)
Mid America Apartment Communities Inc. Shareholders Equity [Member] | Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning Balance | (11,632) | (12,665) | (12,128) | (13,178)
Other comprehensive income - derivative instruments | 248 | 269 | 744 | 782
Ending Balance | (11,384) | (12,396) | (11,384) | (12,396)
Mid America Apartment Communities Inc. Shareholders Equity [Member] | Noncontrolling Interests - Operating Partnership [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning Balance | 185,340 | 209,894 | 206,927 | 214,647
Net Income Attributable to Noncontrolling Interest | 2,568 | 2,126 | 11,636 | 6,096
Other comprehensive income - derivative instruments | (30) | 10 | 91 | 28
Shares issued in exchange for common units | (11,108) | (21) | (33,272) | (471)
Adjustment for noncontrolling interests in Operating Partnership | (22) | (71) | (678) | (244)
Dividends on noncontrolling interest units | (3,486) | (3,866) | (11,338) | (11,984)
Ending Balance | 173,366 | 208,072 | 173,366 | 208,072
Mid America Apartment Communities Inc. Shareholders Equity [Member] | Noncontrolling Interests - Consolidated Real Estate Entities [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning Balance | 16,612 | 6,849 | 9,848 | 6,247
Contribution from noncontrolling interest | 3,204 | 262 | 9,968 | 864
Ending Balance | $ 19,816 | $ 7,111 | $ 19,816 | $ 7,111

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