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MAA Equity (Details) - USD ($) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Stockholders' Equity, Total [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Stock Issued During Period, Value, Stock Options Exercised |  | $ 625,000 |  |
Common Stock [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Shares repurchased and retired |  | 0 |  |
Stock Issued During Period, Value, Stock Options Exercised |  | 0 |  |
Shares issued in exchange for units |  | 0 |  |
Additional Paid-in Capital [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Stock Issued During Period, Value, Stock Options Exercised |  | 625,000 |  |
Noncontrolling Interest [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Dividends on common stock |  | $ 0 |  |
Parent Company [Member] |  |  |  |
Equity [Line Items] |  |  |  |
Common Stock, Dividends, Per Share, Declared | $ 0.9600 | $ 0.9225 |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest | $ 65,958,000 | $ 50,820,000 |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 6,320,133,000 |  | $ 6,369,883,000 |
Noncontrolling Interest in Joint Ventures | 5,166,000 | 2,306,000 | 2,306,000 | $ 2,306,000
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Preferred Stock, Value, Outstanding | 9,000 |  | 9,000 |
Dividends, Preferred Stock, Cash | 922,000 | 922,000 |  |
Other Noncontrolling Interests | 2,860,000 |  |  |
Parent Company [Member] | Accumulated Distributions in Excess of Net Income [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning Balance | (989,263,000) | (784,500,000) |  |
Net income attributable to MAA | 63,660,000 | 49,019,000 |  |
Other comprehensive (loss) income - derivatives insturments (cash flow hedges) | 0 |  |  |
Issuance and registration of common shares | 0 |  |  |
Shares repurchased and retired | 0 |  |  |
Stock Issued During Period, Value, Stock Options Exercised | 0 |  |  |
Shares issued in exchange for units | 0 |  |  |
Redeemable stock fair market value | (1,351,000) | 965,000 |  |
Adjustment for noncontrolling interest ownership in operating partnership | 0 |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification |  | (233,000) |  |
Amortization of unearned compensation | 0 | 0 |  |
Dividends, Preferred Stock, Cash | 922,000 | 922,000 |  |
Dividends on common stock | (109,392,000) | (104,971,000) |  |
Dividends on noncontrolling interest units | 0 |  |  |
Ending Balance | (1,037,268,000) | (840,642,000) |  |
Parent Company [Member] | Preferred Stock [Member] |  |  |  |
Equity [Line Items] |  |  |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest |  | 0 |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 9,000 | 9,000 | $ 9,000 | $ 9,000
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Other comprehensive (loss) income - derivatives insturments (cash flow hedges) |  | 0 |  |
Issuance and registration of common shares |  | 0 |  |
Shares repurchased and retired |  | 0 |  |
Stock Issued During Period, Value, Stock Options Exercised |  | 0 |  |
Shares issued in exchange for units |  | 0 |  |
Redeemable stock fair market value |  | 0 |  |
Adjustment for noncontrolling interest ownership in operating partnership |  | 0 |  |
Amortization of unearned compensation |  | 0 |  |
Dividends on common stock |  | 0 |  |
Dividends on noncontrolling interest units |  | 0 |  |
Parent Company [Member] | Common Stock [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning Balance | 1,136,000 | 1,134,000 |  |
Issuance and registration of common shares | 1,000 | 1,000 |  |
Shares repurchased and retired | 0 |  |  |
Stock Issued During Period, Value, Stock Options Exercised | 0 |  |  |
Shares issued in exchange for units | 0 |  |  |
Ending Balance | 1,137,000 | 1,135,000 |  |
Parent Company [Member] | Additional Paid-in Capital [Member] |  |  |  |
Equity [Line Items] |  |  |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest | 0 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning Balance | 7,138,170,000 | 7,121,112,000 |  |
Other comprehensive (loss) income - derivatives insturments (cash flow hedges) | 0 |  |  |
Shares repurchased and retired | (3,023,000) | (2,912,000) |  |
Stock Issued During Period, Value, Stock Options Exercised | 208,000 |  |  |
Shares issued in exchange for units | 336,000 | 2,780,000 |  |
Shares issued in exchange for redeemable stock |  | 1,915,000 |  |
Redeemable stock fair market value | 0 |  |  |
Adjustment for noncontrolling interest ownership in operating partnership | (60,000) | 92,000 |  |
Amortization of unearned compensation | 4,785,000 | 4,024,000 |  |
Dividends on common stock | 0 |  |  |
Dividends on noncontrolling interest units | 0 |  |  |
Ending Balance | 7,141,544,000 | 7,127,740,000 |  |
Parent Company [Member] | Noncontrolling Interest [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning Balance | 220,043,000 | 231,676,000 |  |
Net Income Attributable to Noncontrolling Interest | 2,298,000 | 1,801,000 |  |
Other comprehensive (loss) income - derivatives insturments (cash flow hedges) | (113,000) | 29,000 |  |
Issuance and registration of common shares | 0 | 0 |  |
Shares repurchased and retired | 0 |  |  |
Stock Issued During Period, Value, Stock Options Exercised | 0 |  |  |
Shares issued in exchange for units | (336,000) | (2,780,000) |  |
Redeemable stock fair market value | 0 |  |  |
Adjustment for noncontrolling interest ownership in operating partnership | 60,000 | (92,000) |  |
Amortization of unearned compensation | 0 |  |  |
Dividends on common stock | 0 |  |  |
Dividends on noncontrolling interest units | (3,941,000) | (3,819,000) |  |
Ending Balance | 218,011,000 | 226,815,000 |  |
Parent Company [Member] | Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |
Equity [Line Items] |  |  |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest | 0 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning Balance | (212,000) | 2,157,000 |  |
Other comprehensive (loss) income - derivatives insturments (cash flow hedges) | (3,088,000) | 610,000 |  |
Issuance and registration of common shares | 0 |  |  |
Shares repurchased and retired | 0 |  |  |
Stock Issued During Period, Value, Stock Options Exercised | 0 |  |  |
Shares issued in exchange for units | 0 |  |  |
Redeemable stock fair market value | 0 |  |  |
Adjustment for noncontrolling interest ownership in operating partnership | 0 |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification |  | 233,000 |  |
Amortization of unearned compensation | 0 |  |  |
Dividends on common stock | 0 |  |  |
Dividends on noncontrolling interest units | 0 |  |  |
Ending Balance | (3,300,000) | 3,000,000 |  |
Parent Company [Member] | Common Stock Including Additional Paid in Capital [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Issuance and registration of common shares | 1,128,000 | 104,000 |  |
Parent Company [Member] | Stockholders' Equity, Total [Member] |  |  |  |
Equity [Line Items] |  |  |  |
Noncontrolling Interest in Joint Ventures | 2,860,000 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning Balance | 6,372,189,000 | 6,573,894,000 |  |
Net Income Including Portion Attributable to Noncontrolling Interest | 65,958,000 | 50,820,000 |  |
Other comprehensive (loss) income - derivatives insturments (cash flow hedges) | (3,201,000) | 639,000 |  |
Issuance and registration of common shares | 1,129,000 | 105,000 |  |
Shares repurchased and retired | (3,023,000) | (2,912,000) |  |
Stock Issued During Period, Value, Stock Options Exercised | 208,000 |  |  |
Shares issued in exchange for units | 0 | 0 |  |
Shares issued in exchange for redeemable stock |  | 1,915,000 |  |
Redeemable stock fair market value | (1,351,000) | 965,000 |  |
Adjustment for noncontrolling interest ownership in operating partnership | 0 | 0 |  |
Amortization of unearned compensation | 4,785,000 | 4,024,000 |  |
Dividends, Preferred Stock, Cash | 922,000 | (922,000) |  |
Dividends on common stock | (109,392,000) | (104,971,000) |  |
Dividends on noncontrolling interest units | (3,941,000) | (3,819,000) |  |
Ending Balance | $ 6,325,299,000 | $ 6,520,363,000 |  |

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