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MAA Equity (Tables) | 9 Months Ended
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Sep. 30, 2018
MAA Equity [Abstract] |
Shareholders' Equity [Table Text Block] |
| Mid-America Apartment Communities, Inc. Shareholders' Equity |  |  |  |  |  |
| Preferred Stock |  | Common Stock |  | Additional Paid-In Capital |  | Accumulated Distributions in Excess of Net Income |  | Accumulated Other Comprehensive Income |  | Noncontrolling Interests - 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 interests | — |  |  | — |  |  | — |  |  | 204,929 |  |  | — |  |  | 7,600 |  |  | — |  |  | 212,529 |
Other comprehensive loss - derivative instruments | — |  |  | — |  |  | — |  |  | — |  |  | (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 interests 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 | — |  |  | — |  |  | — |  |  | (296,535 | ) |  | — |  |  | — |  |  | — |  |  | (296,535 | )
Dividends on noncontrolling interests units | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (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 |
Changes in total equity and its components for the nine months ended September 30, 2018 and 2017 were as follows (dollars in thousands):
| Mid-America Apartment Communities, Inc. Shareholders' Equity |  |  |  |  |  |
| Preferred Stock |  | Common Stock |  | Additional Paid-In Capital |  | Accumulated Distributions in Excess of Net Income |  | Accumulated Other Comprehensive Income |  | Noncontrolling Interests - Operating Partnership |  | Noncontrolling Interest - Consolidated Real Estate Entity |  | Total Equity
EQUITY BALANCE DECEMBER 31, 2017 | $ | 9 |  |  | $ | 1,134 |  |  | $ | 7,121,112 |  |  | $ | (784,500 | ) |  | $ | 2,157 |  |  | $ | 231,676 |  |  | $ | 2,306 |  |  | $ | 6,573,894 |
Net income attributable to controlling interests | — |  |  | — |  |  | — |  |  | 161,617 |  |  | — |  |  | 5,888 |  |  | — |  |  | 167,505 |
Other comprehensive income - derivative instruments | — |  |  | — |  |  | — |  |  | — |  |  | 9,166 |  |  | 335 |  |  | — |  |  | 9,501 |
Issuance and registration of common shares | — |  |  | 1 |  |  | (272 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | (271 | )
Shares repurchased and retired | — |  |  | — |  |  | (2,912 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | (2,912 | )
Exercise of stock options | — |  |  | — |  |  | 916 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 916 |
Shares issued in exchange for common units | — |  |  | 1 |  |  | 4,282 |  |  | — |  |  | — |  |  | (4,283 | ) |  | — |  |  | — |
Shares issued in exchange for redeemable stock | — |  |  | — |  |  | 1,915 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 1,915 |
Redeemable stock fair market value adjustment | — |  |  | — |  |  | — |  |  | 121 |  |  | — |  |  | — |  |  | — |  |  | 121 |
Adjustment for noncontrolling interests in Operating Partnership | — |  |  | — |  |  | 561 |  |  | — |  |  | — |  |  | (561 | ) |  | — |  |  | — |
Cumulative adjustment due to adoption of ASU 2017-12 | — |  |  | — |  |  | — |  |  | (233 | ) |  | 233 |  |  | — |  |  | — |  |  | — |
Amortization of unearned compensation | — |  |  | — |  |  | 9,877 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 9,877 |
Dividends on preferred stock | — |  |  | — |  |  | — |  |  | (2,766 | ) |  | — |  |  | — |  |  | — |  |  | (2,766 | )
Dividends on common stock | — |  |  | — |  |  | — |  |  | (315,012 | ) |  | — |  |  | — |  |  | — |  |  | (315,012 | )
Dividends on noncontrolling interests units | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (11,214 | ) |  | — |  |  | (11,214 | )
EQUITY BALANCE SEPTEMBER 30, 2018 | $ | 9 |  |  | $ | 1,136 |  |  | $ | 7,135,479 |  |  | $ | (940,773 | ) |  | $ | 11,556 |  |  | $ | 221,841 |  |  | $ | 2,306 |  |  | $ | 6,431,554 |

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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