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MAALP Capital | 9 Months Ended
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Sep. 30, 2016
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, 2016 and 2015 were as follows (dollars in thousands, except per unit data):
| Mid-America Apartments, L.P. Unitholders' Capital
| Limited Partner |  | General Partner |  | Accumulated Other Comprehensive Income (Loss) |  | Total Partnership Capital
CAPITAL BALANCE DECEMBER 31, 2015 | $ | 165,726 |  |  | $ | 2,993,696 |  |  | $ | (1,618 | ) |  | $ | 3,157,804 |
Net income | 9,508 |  |  | 172,836 |  |  | — |  |  | 182,344 |
Other comprehensive loss - derivative instruments (cash flow hedges) | — |  |  | — |  |  | (481 | ) |  | (481 | )
Issuance of OP Units | — |  |  | (738 | ) |  | — |  |  | (738 | )
OP Units repurchased and retired | — |  |  | (1,811 | ) |  | — |  |  | (1,811 | )
General partner OP Units issued in exchange for limited partner units | (780 | ) |  | 780 |  |  | — |  |  | — |
OP Units issued in exchange for redeemable units | — |  |  | 122 |  |  | — |  |  | 122 |
Redeemable OP 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 OP Unit) | (10,217 | ) |  | (185,789 | ) |  | — |  |  | (196,006 | )
CAPITAL BALANCE SEPTEMBER 30, 2016 | $ | 164,250 |  |  | $ | 2,985,412 |  |  | $ | (2,099 | ) |  | $ | 3,147,563 |
| Mid-America Apartments, L.P. Unitholders' Capital
| Limited Partner |  | General Partner |  | Accumulated Other Comprehensive Income (Loss) |  | Total Partnership Capital
CAPITAL BALANCE DECEMBER 31, 2014 | $ | 161,310 |  |  | $ | 2,890,858 |  |  | $ | (376 | ) |  | $ | 3,051,792 |
Net income | 16,078 |  |  | 289,300 |  |  | — |  |  | 305,378 |
Other comprehensive loss - derivative instruments (cash flow hedges) | — |  |  | — |  |  | (6,222 | ) |  | (6,222 | )
Issuance of OP Units | — |  |  | 326 |  |  | — |  |  | 326 |
OP Units repurchased and retired | — |  |  | (957 | ) |  | — |  |  | (957 | )
Exercise of OP Unit options |  |  | 420 |  |  | — |  |  | 420 |
General partner OP Units issued in exchange for limited partner units | (236 | ) |  | 236 |  |  | — |  |  | — |
Redeemable OP Units fair market value adjustment | — |  |  | (614 | ) |  | — |  |  | (614 | )
Adjustment for limited partners' capital at redemption value | 58 |  |  | (58 | ) |  | — |  |  | — |
Amortization of unearned compensation | — |  |  | 4,950 |  |  | — |  |  | 4,950 |
Distributions ($2.31 per OP Unit) | (9,671 | ) |  | (174,100 | ) |  | — |  |  | (183,771 | )
CAPITAL BALANCE SEPTEMBER 30, 2015 | $ | 167,539 |  |  | $ | 3,010,361 |  |  | $ | (6,598 | ) |  | $ | 3,171,302 |

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