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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, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Dividends, Preferred Stock, Cash | $ (922) | $ (922) | $ (1,844) | $ (1,844)
Mid America Apartment Communities Inc. Shareholders Equity [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning Balance | 6,019,533 | 6,215,565 | 6,088,408 | 6,289,459
Net Income Including Portion Attributable to Noncontrolling Interest | 223,875 | 77,728 | 272,739 | 115,680
Other comprehensive income (loss) - derivatives instruments (cash flow hedges) | 278 | 278 | 557 | 531
Issuance and registration of common shares | (467) | (416) | (333) | (377)
Shares repurchased and retired | (7,313) | (3,930) | (9,043) | (5,657)
Exercise of stock options |  |  | 1,466 | 71
Redeemable stock fair market value adjustment | (3,031) | (1,297) | (5,189) | 1,814
Amortization of unearned compensation | 4,151 | 2,864 | 10,144 | 8,153
Dividends, Preferred Stock, Cash | (922) | (922) | (1,844) | (1,844)
Dividends on common stock | (117,872) | (114,435) | (235,150) | (228,737)
Dividends on noncontrolling interest units | (3,696) | (4,059) | (7,852) | (8,118)
Contribution from noncontrolling interest | 6,131 | 201 | 6,764 | 602
Ending Balance | 6,120,667 | 6,171,577 | 6,120,667 | 6,171,577
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 | 1,142 | 1,140 | 1,141 | 1,140
Issuance and registration of common shares | 1 |  | 2 |
Shares issued in exchange for common units | 4 |  | 4 |
Ending Balance | 1,147 | 1,140 | 1,147 | 1,140
Mid America Apartment Communities Inc. Shareholders Equity [Member] | Additional Paid-in Capital [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning Balance | 7,182,771 | 7,170,148 | 7,176,793 | 7,166,073
Issuance and registration of common shares | (468) | (416) | (335) | (377)
Shares repurchased and retired | (7,313) | (3,930) | (9,043) | (5,657)
Exercise of stock options |  |  | 1,466 | 71
Shares issued in exchange for common units | 21,928 |  | 22,160 | 450
Adjustment for noncontrolling interests in Operating Partnership | 816 | 220 | 700 | 173
Amortization of unearned compensation | 4,151 | 2,864 | 10,144 | 8,153
Ending Balance | 7,201,885 | 7,168,886 | 7,201,885 | 7,168,886
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 | (1,367,347) | (1,160,944) | (1,294,182) | (1,085,479)
Net income attributable to MAA | 216,478 | 75,062 | 263,671 | 111,710
Redeemable stock fair market value adjustment | (3,031) | (1,297) | (5,189) | 1,814
Dividends, Preferred Stock, Cash | (922) | (922) | (1,844) | (1,844)
Dividends on common stock | (117,872) | (114,435) | (235,150) | (228,737)
Ending Balance | (1,272,694) | (1,202,536) | (1,272,694) | (1,202,536)
Mid America Apartment Communities Inc. Shareholders Equity [Member] | Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning Balance | (11,859) | (12,934) | (12,128) | (13,178)
Other comprehensive income (loss) - derivatives instruments (cash flow hedges) | 227 | 269 | 496 | 513
Ending Balance | (11,632) | (12,665) | (11,632) | (12,665)
Mid America Apartment Communities Inc. Shareholders Equity [Member] | Noncontrolling Interests - Operating Partnership [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning Balance | 204,336 | 211,498 | 206,927 | 214,647
Net Income Attributable to Noncontrolling Interest | 7,397 | 2,666 | 9,068 | 3,970
Other comprehensive income (loss) - derivatives instruments (cash flow hedges) | 51 | 9 | 61 | 18
Shares issued in exchange for common units | (21,932) |  | (22,164) | (450)
Adjustment for noncontrolling interests in Operating Partnership | (816) | (220) | (700) | (173)
Dividends on noncontrolling interest units | (3,696) | (4,059) | (7,852) | (8,118)
Ending Balance | 185,340 | 209,894 | 185,340 | 209,894
Mid America Apartment Communities Inc. Shareholders Equity [Member] | Noncontrolling Interests - Consolidated Real Estate Entities [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning Balance | 10,481 | 6,648 | 9,848 | 6,247
Contribution from noncontrolling interest | 6,131 | 201 | 6,764 | 602
Ending Balance | $ 16,612 | $ 6,849 | $ 16,612 | $ 6,849

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