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MAALP Capital (Tables) | 9 Months Ended
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Sep. 30, 2018
MAALP Capital [Abstract] |
Partners' Capital [Table Text Block] | Changes in total capital and its components for the nine months ended September 30, 2018 and 2017 were as follows (dollars in thousands):
| Mid-America Apartments, L.P. Unitholders' Capital |  |  |  |
| Limited Partner |  | General Partner |  | Preferred Units |  | Accumulated Other Comprehensive Income |  | Noncontrolling Interest - Consolidated Real Estate Entity |  | Total Partnership Capital
CAPITAL BALANCE DECEMBER 31, 2017 | $ | 231,676 |  |  | $ | 6,270,758 |  |  | $ | 66,840 |  |  | $ | 2,295 |  |  | $ | 2,306 |  |  | $ | 6,573,875 |
Net income | 5,888 |  |  | 158,851 |  |  | 2,766 |  |  | — |  |  | — |  |  | 167,505 |
Other comprehensive income - derivative instruments | — |  |  | — |  |  | — |  |  | 9,501 |  |  | — |  |  | 9,501 |
Issuance of units | — |  |  | (271 | ) |  | — |  |  | — |  |  | — |  |  | (271 | )
Units repurchased and retired | — |  |  | (2,912 | ) |  | — |  |  | — |  |  | — |  |  | (2,912 | )
Exercise of unit options | — |  |  | 916 |  |  | — |  |  | — |  |  | — |  |  | 916 |
General partner units issued in exchange for limited partner units | (4,283 | ) |  | 4,283 |  |  | — |  |  | — |  |  | — |  |  | — |
Units issued in exchange for redeemable units | — |  |  | 1,915 |  |  | — |  |  | — |  |  | — |  |  | 1,915 |
Redeemable units fair market value adjustment | — |  |  | 121 |  |  | — |  |  | — |  |  | — |  |  | 121 |
Adjustment for limited partners' capital at redemption value | (226 | ) |  | 226 |  |  | — |  |  | — |  |  | — |  |  | — |
Cumulative adjustment due to adoption of ASU 2017-12 | — |  |  | (233 | ) |  | — |  |  | 233 |  |  | — |  |  | — |
Amortization of unearned compensation | — |  |  | 9,877 |  |  | — |  |  | — |  |  | — |  |  | 9,877 |
Distributions to preferred unitholders | — |  |  | — |  |  | (2,766 | ) |  | — |  |  | — |  |  | (2,766 | )
Distributions to common unitholders | (11,214 | ) |  | (315,012 | ) |  | — |  |  | — |  |  | — |  |  | (326,226 | )
CAPITAL BALANCE SEPTEMBER 30, 2018 | $ | 221,841 |  |  | $ | 6,128,519 |  |  | $ | 66,840 |  |  | $ | 12,029 |  |  | $ | 2,306 |  |  | $ | 6,431,535 |
| Mid-America Apartments, L.P. Unitholders' Capital |  |  |  |
| Limited Partner |  | General Partner |  | Preferred Units |  | Accumulated Other Comprehensive Income |  | Noncontrolling Interest - Consolidated Real Estate Entity |  | Total Partnership Capital
CAPITAL BALANCE DECEMBER 31, 2016 | $ | 235,976 |  |  | $ | 6,337,721 |  |  | $ | 64,833 |  |  | $ | 1,246 |  |  | $ | 2,306 |  |  | $ | 6,642,082 |
Net income | 7,600 |  |  | 202,163 |  |  | 2,766 |  |  | — |  |  | — |  |  | 212,529 |
Other comprehensive income - derivative instruments | — |  |  | — |  |  | — |  |  | (368 | ) |  | — |  |  | (368 | )
Issuance of units | — |  |  | 154 |  |  | 2,007 |  |  | — |  |  | — |  |  | 2,161 |
Units repurchased and retired | — |  |  | (4,782 | ) |  | — |  |  | — |  |  | — |  |  | (4,782 | )
Exercise of unit options | — |  |  | 218 |  |  | — |  |  | — |  |  | — |  |  | 218 |
General partner units issued in exchange for limited partner units | (1,133 | ) |  | 1,133 |  |  | — |  |  | — |  |  | — |  |  | — |
Units issued in exchange for redeemable units | — |  |  | 1,482 |  |  | — |  |  | — |  |  | — |  |  | 1,482 |
Redeemable units fair market value adjustment | — |  |  | (870 | ) |  | — |  |  | — |  |  | — |  |  | (870 | )
Adjustment for limited partners' capital at redemption value | (68 | ) |  | 68 |  |  | — |  |  | — |  |  | — |  |  | — |
Amortization of unearned compensation | — |  |  | 8,438 |  |  | — |  |  | — |  |  | — |  |  | 8,438 |
Distributions to preferred unitholders | — |  |  | — |  |  | (2,766 | ) |  | — |  |  | — |  |  | (2,766 | )
Distributions to common unitholders | (10,982 | ) |  | (296,535 | ) |  | — |  |  | — |  |  | — |  |  | (307,517 | )
CAPITAL BALANCE SEPTEMBER 30, 2017 | $ | 231,393 |  |  | $ | 6,249,190 |  |  | $ | 66,840 |  |  | $ | 878 |  |  | $ | 2,306 |  |  | $ | 6,550,607 |

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- Definition MAALP Capital [Abstract] + References No definition available. + Details
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Namespace Prefix: | maa_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Partners' Capital [Table Text Block] + References No definition available. + Details
Name: | maa_PartnersCapitalTableTextBlock
Namespace Prefix: | maa_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration