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MAALP Capital (Tables) | 3 Months Ended
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Mar. 31, 2017
MAALP Capital [Abstract] |
Partners' Capital [Table Text Block] | Changes in total capital and its components for the three-month periods ended March 31, 2017 and 2016 were as follows (dollars in thousands, except per unit data):
| Mid-America Apartments, L.P. Unitholders' Capital |  |  |  |
| Limited Partner |  | General Partner |  | Preferred Units |  | Accumulated Other Comprehensive Income (Loss) |  | 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 attributable to controlling interest | 1,511 |  |  | 40,983 |  |  | 922 |  |  | — |  |  | — |  |  | 43,416 |
Other comprehensive income - derivative instruments (cash flow hedges) | — |  |  | — |  |  | — |  |  | 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 ($0.87 per unit) | (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 |
| Mid-America Apartments, L.P. Unitholders' Capital |  |  |  |
| Limited Partner |  | General Partner |  | Preferred Units |  | Accumulated Other Comprehensive Income (Loss) |  | Noncontrolling Interest - Consolidated Real Estate Entity |  | Total Partnership Capital
CAPITAL BALANCE DECEMBER 31, 2015 | $ | 165,726 |  |  | $ | 2,993,696 |  |  | $ | — |  |  | $ | (1,618 | ) |  | $ | — |  |  | $ | 3,157,804 |
Net income attributable to controlling interest | 2,395 |  |  | 43,413 |  |  | — |  |  | — |  |  | — |  |  | 45,808 |
Other comprehensive loss - derivative instruments (cash flow hedges) | — |  |  | — |  |  | — |  |  | (2,519 | ) |  | — |  |  | (2,519 | )
Issuance of units | — |  |  | 90 |  |  | — |  |  | — |  |  | — |  |  | 90 |
Units repurchased and retired | — |  |  | (1,730 | ) |  | — |  |  | — |  |  | — |  |  | (1,730 | )
General partner units issued in exchange for limited partner units | (33 | ) |  | 33 |  |  | — |  |  | — |  |  | — |  |  | — |
Units issued in exchange for redeemable units | — |  |  | 123 |  |  | — |  |  | — |  |  | — |  |  | 123 |
Redeemable units fair market value adjustment | — |  |  | (1,100 | ) |  | — |  |  | — |  |  | — |  |  | (1,100 | )
Adjustment for limited partners' capital at redemption value | (172 | ) |  | 172 |  |  | — |  |  | — |  |  | — |  |  | — |
Amortization of unearned compensation | — |  |  | 2,078 |  |  | — |  |  | — |  |  | — |  |  | 2,078 |
Distributions ($0.82 per unit) | (3,412 | ) |  | (61,928 | ) |  | — |  |  | — |  |  | — |  |  | (65,340 | )
CAPITAL BALANCE MARCH 31, 2016 | $ | 164,504 |  |  | $ | 2,974,847 |  |  | $ | — |  |  | $ | (4,137 | ) |  | $ | — |  |  | $ | 3,135,214 |

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- Definition Partners' Capital [Table Text Block] + References No definition available. + Details
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