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MAA Equity (Tables) | 3 Months Ended
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Mar. 31, 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 | — |  |  | — |  |  | — |  |  | 41,905 |  |  | — |  |  | 1,511 |  |  | — |  |  | 43,416 |
Other comprehensive loss - derivative instruments | — |  |  | — |  |  | — |  |  | — |  |  | 3,079 |  |  | 113 |  |  | — |  |  | 3,192 |
Issuance and registration of common shares | — |  |  | 1 |  |  | 67 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 68 |
Issuance and registration of preferred shares | — |  |  | — |  |  | 2,007 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 2,007 |
Shares repurchased and retired | — |  |  | — |  |  | (4,734 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | (4,734 | )
Shares issued in exchange for common units | — |  |  | — |  |  | 167 |  |  | — |  |  | — |  |  | (167 | ) |  | — |  |  | — |
Shares issued in exchange for redeemable stock | — |  |  | — |  |  | 1,482 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 1,482 |
Redeemable stock fair market value adjustment | — |  |  | — |  |  | — |  |  | (298 | ) |  | — |  |  | — |  |  | — |  |  | (298 | )
Adjustment for noncontrolling interests in Operating Partnership | — |  |  | — |  |  | 305 |  |  | — |  |  | — |  |  | (305 | ) |  | — |  |  | — |
Amortization of unearned compensation | — |  |  | — |  |  | 3,139 |  |  | (114 | ) |  | — |  |  | — |  |  | — |  |  | 3,025 |
Dividends on preferred stock | — |  |  | — |  |  | — |  |  | (922 | ) |  | — |  |  | — |  |  | — |  |  | (922 | )
Dividends on common stock | — |  |  | — |  |  | — |  |  | (98,841 | ) |  | — |  |  | — |  |  | — |  |  | (98,841 | )
Dividends on noncontrolling interests units | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (3,664 | ) |  | — |  |  | (3,664 | )
EQUITY BALANCE MARCH 31, 2017 | $ | 9 |  |  | $ | 1,134 |  |  | $ | 7,111,445 |  |  | $ | (765,749 | ) |  | $ | 4,223 |  |  | $ | 233,464 |  |  | $ | 2,306 |  |  | $ | 6,586,832 |
Changes in total equity and its components for the three months ended March 31, 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 | — |  |  | — |  |  | — |  |  | 49,019 |  |  | — |  |  | 1,801 |  |  | — |  |  | 50,820 |
Other comprehensive income - derivative instruments | — |  |  | — |  |  | — |  |  | — |  |  | 610 |  |  | 29 |  |  | — |  |  | 639 |
Issuance and registration of common shares | — |  |  | 1 |  |  | 104 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 105 |
Shares repurchased and retired | — |  |  | — |  |  | (2,912 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | (2,912 | )
Exercise of stock options | — |  |  | — |  |  | 625 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 625 |
Shares issued in exchange for common units | — |  |  | — |  |  | 2,780 |  |  | — |  |  | — |  |  | (2,780 | ) |  | — |  |  | — |
Shares issued in exchange for redeemable stock | — |  |  | — |  |  | 1,915 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 1,915 |
Redeemable stock fair market value adjustment | — |  |  | — |  |  | — |  |  | 965 |  |  | — |  |  | — |  |  | — |  |  | 965 |
Adjustment for noncontrolling interests in Operating Partnership | — |  |  | — |  |  | 92 |  |  | — |  |  | — |  |  | (92 | ) |  | — |  |  | — |
Cumulative adjustment due to adoption of ASU 2017-12 | — |  |  | — |  |  | — |  |  | (233 | ) |  | 233 |  |  | — |  |  | — |  |  | — |
Amortization of unearned compensation | — |  |  | — |  |  | 4,024 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 4,024 |
Dividends on preferred stock | — |  |  | — |  |  | — |  |  | (922 | ) |  | — |  |  | — |  |  | — |  |  | (922 | )
Dividends on common stock | — |  |  | — |  |  | — |  |  | (104,971 | ) |  | — |  |  | — |  |  | — |  |  | (104,971 | )
Dividends on noncontrolling interests units | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (3,819 | ) |  | — |  |  | (3,819 | )
EQUITY BALANCE MARCH 31, 2018 | $ | 9 |  |  | $ | 1,135 |  |  | $ | 7,127,740 |  |  | $ | (840,642 | ) |  | $ | 3,000 |  |  | $ | 226,815 |  |  | $ | 2,306 |  |  | $ | 6,520,363 |

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- Definition MAA Equity [Abstract] + References No definition available. + Details
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Namespace Prefix: | maa_
Data Type: | xbrli:stringItemType
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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