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MAALP Capital | 9 Months Ended
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Sep. 30, 2017
MAALP Capital [Abstract] |
Consolidated Statements of Changes in Capital [Text Block] | MAALP Capital Changes in total capital and its components for the nine-month periods ended September 30, 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 | 7,600 |  |  | 202,163 |  |  | 2,766 |  |  | — |  |  | — |  |  | 212,529 |
Other comprehensive income - derivative instruments (cash flow hedges) | — |  |  | — |  |  | — |  |  | (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 ($2.61 per unit) | (10,982 | ) |  | (296,535 | ) |  | — |  |  | — |  |  | — |  |  | (307,517 | )
CAPITAL BALANCE SEPTEMBER 30, 2017 | $ | 231,393 |  |  | $ | 6,249,190 |  |  | $ | 66,840 |  |  | $ | 878 |  |  | $ | 2,306 |  |  | $ | 6,550,607 |
| 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 | 9,508 |  |  | 172,836 |  |  | — |  |  | — |  |  | — |  |  | 182,344 |
Other comprehensive loss - derivative instruments (cash flow hedges) | — |  |  | — |  |  | — |  |  | (481 | ) |  | — |  |  | (481 | )
Issuance of units | — |  |  | (738 | ) |  | — |  |  | — |  |  | — |  |  | (738 | )
Units repurchased and retired | — |  |  | (1,811 | ) |  | — |  |  | — |  |  | — |  |  | (1,811 | )
General partner units issued in exchange for limited partner units | (780 | ) |  | 780 |  |  | — |  |  | — |  |  | — |  |  | — |
Units issued in exchange for redeemable units | — |  |  | 122 |  |  | — |  |  | — |  |  | — |  |  | 122 |
Redeemable units fair market value adjustment | — |  |  | (296 | ) |  | — |  |  | — |  |  | — |  |  | (296 | )
Adjustment for limited partners' capital at redemption value | 13 |  |  | (13 | ) |  | — |  |  | — |  |  | — |  |  | — |
Amortization of unearned compensation | — |  |  | 6,625 |  |  | — |  |  | — |  |  | — |  |  | 6,625 |
Distributions ($2.46 per unit) | (10,217 | ) |  | (185,789 | ) |  | — |  |  | — |  |  | — |  |  | (196,006 | )
CAPITAL BALANCE SEPTEMBER 30, 2016 | $ | 164,250 |  |  | $ | 2,985,412 |  |  | $ | — |  |  | $ | (2,099 | ) |  | $ | — |  |  | $ | 3,147,563 |

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- Definition MAALP Capital [Abstract] + References No definition available. + Details
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