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MAA Equity (Tables) | 9 Months Ended
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Sep. 30, 2017
MAA Equity [Abstract] |
Shareholders' Equity [Table Text Block] |
| Mid-America Apartment Communities, Inc. Shareholders' Equity |  |  |  |  |  |
| Preferred Stock Amount |  | Common Stock Amount |  | Additional Paid-In Capital |  | Accumulated Distributions in Excess of Net Income |  | Accumulated Other Comprehensive Income (Loss) |  | Noncontrolling Interest Operating Partnership |  | Noncontrolling Interest - Consolidated Real Estate Entity |  | Total Equity
EQUITY BALANCE DECEMBER 31, 2015 | $ | — |  |  | $ | 753 |  |  | $ | 3,627,074 |  |  | $ | (634,141 | ) |  | $ | (1,589 | ) |  | $ | 165,726 |  |  | $ | — |  |  | $ | 3,157,823 |
Net income attributable to controlling interest | — |  |  | — |  |  | — |  |  | 172,836 |  |  | — |  |  | 9,508 |  |  | — |  |  | 182,344 |
Other comprehensive loss - derivative instruments (cash flow hedges) | — |  |  | — |  |  | — |  |  | — |  |  | (456 | ) |  | (25 | ) |  | — |  |  | (481 | )
Issuance and registration of common shares | — |  |  | 1 |  |  | (739 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | (738 | )
Shares repurchased and retired | — |  |  | — |  |  | (1,811 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | (1,811 | )
Shares issued in exchange for common units | — |  |  | — |  |  | 780 |  |  | — |  |  | — |  |  | (780 | ) |  | — |  |  | — |
Shares issued in exchange for redeemable stock | — |  |  | — |  |  | 122 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 122 |
Redeemable stock fair market value adjustment | — |  |  | — |  |  | — |  |  | (296 | ) |  | — |  |  | — |  |  | — |  |  | (296 | )
Adjustment for noncontrolling interest ownership in operating partnership | — |  |  | — |  |  | (38 | ) |  | — |  |  | — |  |  | 38 |  |  | — |  |  | — |
Amortization of unearned compensation | — |  |  | — |  |  | 6,625 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 6,625 |
Dividends on common stock ($2.46 per share) | — |  |  | — |  |  | — |  |  | (185,789 | ) |  | — |  |  | — |  |  | — |  |  | (185,789 | )
Dividends on noncontrolling interest units ($2.46 per unit) | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (10,217 | ) |  | — |  |  | (10,217 | )
EQUITY BALANCE SEPTEMBER 30, 2016 | $ | — |  |  | $ | 754 |  |  | $ | 3,632,013 |  |  | $ | (647,390 | ) |  | $ | (2,045 | ) |  | $ | 164,250 |  |  | $ | — |  |  | $ | 3,147,582 |
Changes in total equity and its components for the nine-month periods ended September 30, 2017 and 2016 were as follows (dollars in thousands, except per share and per unit data):
| Mid-America Apartment Communities, Inc. Shareholders' Equity |  |  |  |  |  |
| Preferred Stock Amount |  | Common Stock Amount |  | Additional Paid-In Capital |  | Accumulated Distributions in Excess of Net Income |  | Accumulated Other Comprehensive Income (Loss) |  | Noncontrolling Interest Operating Partnership |  | Noncontrolling Interest - Consolidated Real Estate Entity |  | Total Equity
EQUITY BALANCE DECEMBER 31, 2016 | $ | 9 |  |  | $ | 1,133 |  |  | $ | 7,109,012 |  |  | $ | (707,479 | ) |  | $ | 1,144 |  |  | $ | 235,976 |  |  | $ | 2,306 |  |  | $ | 6,642,101 |
Net income attributable to controlling interest | — |  |  | — |  |  | — |  |  | 204,929 |  |  | — |  |  | 7,600 |  |  | — |  |  | 212,529 |
Other comprehensive income - derivative instruments (cash flow hedges) | — |  |  | — |  |  | — |  |  | — |  |  | (354 | ) |  | (14 | ) |  | — |  |  | (368 | )
Issuance and registration of common shares | — |  |  | 1 |  |  | 153 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 154 |
Issuance and registration of preferred shares | — |  |  | — |  |  | 2,007 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 2,007 |
Shares repurchased and retired | — |  |  | — |  |  | (4,782 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | (4,782 | )
Exercise of stock options | — |  |  | — |  |  | 218 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 218 |
Shares issued in exchange for common units | — |  |  | — |  |  | 1,133 |  |  | — |  |  | — |  |  | (1,133 | ) |  | — |  |  | — |
Shares issued in exchange for redeemable stock | — |  |  | — |  |  | 1,482 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 1,482 |
Redeemable stock fair market value adjustment | — |  |  | — |  |  | — |  |  | (870 | ) |  | — |  |  | — |  |  | — |  |  | (870 | )
Adjustment for noncontrolling interest ownership in operating partnership | — |  |  | — |  |  | 54 |  |  | — |  |  | — |  |  | (54 | ) |  | — |  |  | — |
Amortization of unearned compensation | — |  |  | — |  |  | 8,552 |  |  | (114 | ) |  | — |  |  | — |  |  | — |  |  | 8,438 |
Dividends on preferred stock | — |  |  | — |  |  | — |  |  | (2,766 | ) |  | — |  |  | — |  |  | — |  |  | (2,766 | )
Dividends on common stock ($2.61 per share) | — |  |  | — |  |  | — |  |  | (296,535 | ) |  | — |  |  | — |  |  | — |  |  | (296,535 | )
Dividends on noncontrolling interest units ($2.61 per unit) | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (10,982 | ) |  | — |  |  | (10,982 | )
EQUITY BALANCE SEPTEMBER 30, 2017 | $ | 9 |  |  | $ | 1,134 |  |  | $ | 7,117,829 |  |  | $ | (802,835 | ) |  | $ | 790 |  |  | $ | 231,393 |  |  | $ | 2,306 |  |  | $ | 6,550,626 |

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- Definition MAA Equity [Abstract] + References No definition available. + Details
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Namespace Prefix: | maa_
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- Definition Shareholders' Equity [Table Text Block] + References No definition available. + Details
Name: | maa_ShareholdersEquityTableTextBlock
Namespace Prefix: | maa_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration