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MAALP Capital (Tables) | 3 Months Ended
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Mar. 31, 2018
MAALP Capital [Abstract] |
Partners' Capital [Table Text Block] | Changes in total capital and its components for the three months ended March 31, 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 | 1,801 |  |  | 48,097 |  |  | 922 |  |  | — |  |  | — |  |  | 50,820 |
Other comprehensive income - derivative instruments | — |  |  | — |  |  | — |  |  | 639 |  |  | — |  |  | 639 |
Issuance of units | — |  |  | 105 |  |  | — |  |  | — |  |  | — |  |  | 105 |
Units repurchased and retired | — |  |  | (2,912 | ) |  | — |  |  | — |  |  | — |  |  | (2,912 | )
Exercise of unit options | — |  |  | 625 |  |  | — |  |  | — |  |  | — |  |  | 625 |
General partner units issued in exchange for limited partner units | (2,780 | ) |  | 2,780 |  |  | — |  |  | — |  |  | — |  |  | — |
Units issued in exchange for redeemable units | — |  |  | 1,915 |  |  | — |  |  | — |  |  | — |  |  | 1,915 |
Redeemable units fair market value adjustment | — |  |  | 965 |  |  | — |  |  | — |  |  | — |  |  | 965 |
Adjustment for limited partners' capital at redemption value | (63 | ) |  | 63 |  |  | — |  |  | — |  |  | — |  |  | — |
Cumulative adjustment due to adoption of ASU 2017-12 | — |  |  | (233 | ) |  | — |  |  | 233 |  |  | — |  |  | — |
Amortization of unearned compensation | — |  |  | 4,024 |  |  | — |  |  | — |  |  | — |  |  | 4,024 |
Distributions to preferred unitholders | — |  |  | — |  |  | (922 | ) |  | — |  |  | — |  |  | (922 | )
Distributions to common unitholders | (3,819 | ) |  | (104,971 | ) |  | — |  |  | — |  |  | — |  |  | (108,790 | )
CAPITAL BALANCE MARCH 31, 2018 | $ | 226,815 |  |  | $ | 6,221,216 |  |  | $ | 66,840 |  |  | $ | 3,167 |  |  | $ | 2,306 |  |  | $ | 6,520,344 |
| 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 | 1,511 |  |  | 40,983 |  |  | 922 |  |  | — |  |  | — |  |  | 43,416 |
Other comprehensive income - derivative instruments | — |  |  | — |  |  | — |  |  | 3,192 |  |  | — |  |  | 3,192 |
Issuance of units | — |  |  | 68 |  |  | 2,007 |  |  | — |  |  | — |  |  | 2,075 |
Units repurchased and retired | — |  |  | (4,734 | ) |  | — |  |  | — |  |  | — |  |  | (4,734 | )
General partner units issued in exchange for limited partner units | (167 | ) |  | 167 |  |  | — |  |  | — |  |  | — |  |  | — |
Units issued in exchange for redeemable units | — |  |  | 1,482 |  |  | — |  |  | — |  |  | — |  |  | 1,482 |
Redeemable units fair market value adjustment | — |  |  | (298 | ) |  | — |  |  | — |  |  | — |  |  | (298 | )
Adjustment for limited partners' capital at redemption value | (192 | ) |  | 192 |  |  | — |  |  | — |  |  | — |  |  | — |
Amortization of unearned compensation | — |  |  | 3,025 |  |  | — |  |  | — |  |  | — |  |  | 3,025 |
Distributions to preferred unitholders | — |  |  | — |  |  | (922 | ) |  | — |  |  | — |  |  | (922 | )
Distributions to common unitholders | (3,664 | ) |  | (98,841 | ) |  | — |  |  | — |  |  | — |  |  | (102,505 | )
CAPITAL BALANCE MARCH 31, 2017 | $ | 233,464 |  |  | $ | 6,279,765 |  |  | $ | 66,840 |  |  | $ | 4,438 |  |  | $ | 2,306 |  |  | $ | 6,586,813 |

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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