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MAA Equity (Tables) | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
MAA Equity [Abstract] |  |
Shareholders' Equity [Table Text Block] | Changes in total equity and its components for the three months ended March 31, 2019 and 2018 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 Interests - Consolidated Real Estate Entities |  | Total Equity
EQUITY BALANCE DECEMBER 31, 2018 | $ | 9 |  |  | $ | 1,136 |  |  | $ | 7,138,170 |  |  | $ | (989,263 | ) |  | $ | (212 | ) |  | $ | 220,043 |  |  | $ | 2,306 |  |  | $ | 6,372,189 |
Net income | — |  |  | — |  |  | — |  |  | 63,660 |  |  | — |  |  | 2,298 |  |  | — |  |  | 65,958 |
Other comprehensive income - derivative instruments | — |  |  | — |  |  | — |  |  | — |  |  | (3,088 | ) |  | (113 | ) |  | — |  |  | (3,201 | )
Issuance and registration of common shares | — |  |  | 1 |  |  | 1,128 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 1,129 |
Shares repurchased and retired | — |  |  | — |  |  | (3,023 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | (3,023 | )
Exercise of stock options | — |  |  | — |  |  | 208 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 208 |
Shares issued in exchange for common units | — |  |  | — |  |  | 336 |  |  | — |  |  | — |  |  | (336 | ) |  | — |  |  | — |
Redeemable stock fair market value adjustment | — |  |  | — |  |  | — |  |  | (1,351 | ) |  | — |  |  | — |  |  | — |  |  | (1,351 | )
Adjustment for noncontrolling interests in Operating Partnership | — |  |  | — |  |  | (60 | ) |  | — |  |  | — |  |  | 60 |  |  | — |  |  | — |
Amortization of unearned compensation | — |  |  | — |  |  | 4,785 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 4,785 |
Dividends on preferred stock | — |  |  | — |  |  | — |  |  | (922 | ) |  | — |  |  | — |  |  | — |  |  | (922 | )
Dividends on common stock ($0.9600 per share) | — |  |  | — |  |  | — |  |  | (109,392 | ) |  | — |  |  | — |  |  | — |  |  | (109,392 | )
Dividends on noncontrolling interests units ($0.9600 per unit) | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (3,941 | ) |  | — |  |  | (3,941 | )
Contribution from noncontrolling interest | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 2,860 |  |  | 2,860 |
EQUITY BALANCE MARCH 31, 2019 | $ | 9 |  |  | $ | 1,137 |  |  | $ | 7,141,544 |  |  | $ | (1,037,268 | ) |  | $ | (3,300 | ) |  | $ | 218,011 |  |  | $ | 5,166 |  |  | $ | 6,325,299 |
| 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 Interests - Consolidated Real Estate Entities |  | 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 | — |  |  | — |  |  | — |  |  | 49,019 |  |  | — |  |  | 1,801 |  |  | — |  |  | 50,820 |
Other comprehensive loss - 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 ($0.9225 per share) | — |  |  | — |  |  | — |  |  | (104,971 | ) |  | — |  |  | — |  |  | — |  |  | (104,971 | )
Dividends on noncontrolling interests units ($0.9225 per unit) | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (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