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v3.19.1

MAALP Capital | 3 Months Ended
--- | ---
Mar. 31, 2019
MAALP Capital [Abstract] |
Consolidated Statements of Changes in Capital [Text Block] | MAALP Capital Changes in total capital and its components for the three months ended March 31, 2019 and 2018 were as follows (dollars in thousands):
| Mid-America Apartments, L.P. Unitholders' Capital |  |  |  |
| Limited Partner |  | General Partner |  | Preferred Units |  | Accumulated Other Comprehensive Income |  | Noncontrolling Interests- Consolidated Real Estate Entities |  | Total Partnership Capital
CAPITAL BALANCE DECEMBER 31, 2018 | $ | 220,043 |  |  | $ | 6,083,142 |  |  | $ | 66,840 |  |  | $ | (161 | ) |  | $ | 2,306 |  |  | $ | 6,372,170 |
Net income | 2,298 |  |  | 62,738 |  |  | 922 |  |  | — |  |  | — |  |  | 65,958 |
Other comprehensive income - derivative instruments | — |  |  | — |  |  | — |  |  | (3,201 | ) |  | — |  |  | (3,201 | )
Issuance of units | — |  |  | 1,129 |  |  | — |  |  | — |  |  | — |  |  | 1,129 |
Units repurchased and retired | — |  |  | (3,023 | ) |  | — |  |  | — |  |  | — |  |  | (3,023 | )
Exercise of unit options | — |  |  | 208 |  |  | — |  |  | — |  |  | — |  |  | 208 |
General partner units issued in exchange for limited partner units | (336 | ) |  | 336 |  |  | — |  |  | — |  |  | — |  |  | — |
Redeemable units fair market value adjustment | — |  |  | (1,351 | ) |  | — |  |  | — |  |  | — |  |  | (1,351 | )
Adjustment for limited partners' capital at redemption value | (53 | ) |  | 53 |  |  | — |  |  | — |  |  | — |  |  | — |
Amortization of unearned compensation | — |  |  | 4,785 |  |  | — |  |  | — |  |  | — |  |  | 4,785 |
Distributions to preferred unitholders | — |  |  | — |  |  | (922 | ) |  | — |  |  | — |  |  | (922 | )
Distributions to common unitholders ($0.9600 per unit) | (3,941 | ) |  | (109,392 | ) |  | — |  |  | — |  |  | — |  |  | (113,333 | )
Contribution from noncontrolling interest | — |  |  | — |  |  | — |  |  | — |  |  | 2,860 |  |  | 2,860 |
CAPITAL BALANCE MARCH 31, 2019 | $ | 218,011 |  |  | $ | 6,038,625 |  |  | $ | 66,840 |  |  | $ | (3,362 | ) |  | $ | 5,166 |  |  | $ | 6,325,280 |
| Mid-America Apartments, L.P. Unitholders' Capital |  |  |  |
| Limited Partner |  | General Partner |  | Preferred Units |  | Accumulated Other Comprehensive Income |  | Noncontrolling Interests - Consolidated Real Estate Entities |  | 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 ($0.9225 per unit) | (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 |

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