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MAALP Capital (Tables) | 9 Months Ended
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Sep. 30, 2020
M A A L P Capital [Abstract] |
Summary of Changes in Total Capital and its Components | Changes in MAALP’s total capital and its components for the three months ended September 30, 2020 and 2019 were as follows (dollars in thousands):
|  | Mid-America Apartments, L.P. Unitholders’ Capital |  |  |  |  |  |  |  |  |
|  | Limited Partners |  |  | General Partner |  |  | Preferred Units |  |  | Accumulated Other Comprehensive Loss |  |  | Noncontrolling Interests- Consolidated Real Estate Entities |  |  | Total Partnership Capital |
CAPITAL BALANCE JUNE 30, 2020 |  | $ | 209,894 |  |  | $ | 5,901,028 |  |  | $ | 66,840 |  |  | $ | (13,053 | ) |  | $ | 6,849 |  |  | $ | 6,171,558 |
Net income |  |  | 2,126 |  |  |  | 58,988 |  |  |  | 922 |  |  |  | — |  |  |  | — |  |  |  | 62,036 |
Other comprehensive income - derivative instruments |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 279 |  |  |  | — |  |  |  | 279 |
Issuance of units |  |  | — |  |  |  | 33 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 33 |
General partnership units issued in exchange for limited partnership units |  |  | (21 | ) |  |  | 21 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Redeemable units fair market value adjustment |  |  | — |  |  |  | (155 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (155 | )
Adjustment for limited partners’ capital at redemption value |  |  | (61 | ) |  |  | 61 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Amortization of unearned compensation |  |  | — |  |  |  | 4,380 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 4,380 |
Distributions to preferred unitholders |  |  | — |  |  |  | — |  |  |  | (922 | ) |  |  | — |  |  |  | — |  |  |  | (922 | )
Distributions to common unitholders ($1.00 per unit) |  |  | (3,866 | ) |  |  | (114,369 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (118,235 | )
Contribution from noncontrolling interest |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 262 |  |  |  | 262 |
CAPITAL BALANCE SEPTEMBER 30, 2020 |  | $ | 208,072 |  |  | $ | 5,849,987 |  |  | $ | 66,840 |  |  | $ | (12,774 | ) |  | $ | 7,111 |  |  | $ | 6,119,236 |
|  | Mid-America Apartments, L.P. Unitholders’ Capital |  |  |  |  |  |  |  |  |
|  | Limited Partners |  |  | General Partner |  |  | Preferred Units |  |  | Accumulated Other Comprehensive Loss |  |  | Noncontrolling Interests - Consolidated Real Estate Entities |  |  | Total Partnership Capital |
CAPITAL BALANCE JUNE 30, 2019 |  | $ | 215,404 |  |  | $ | 5,993,973 |  |  | $ | 66,840 |  |  | $ | (9,366 | ) |  | $ | 5,656 |  |  | $ | 6,272,507 |
Net income |  |  | 2,814 |  |  |  | 77,723 |  |  |  | 922 |  |  |  | — |  |  |  | — |  |  |  | 81,459 |
Other comprehensive loss - derivative instruments |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (5,973 | ) |  |  | — |  |  |  | (5,973 | )
Issuance of units |  |  | — |  |  |  | 140 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 140 |
Exercise of unit options |  |  | — |  |  |  | (204 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (204 | )
General partnership units issued in exchange for limited partnership units |  |  | (836 | ) |  |  | 836 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Redeemable units fair market value adjustment |  |  | — |  |  |  | (1,269 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (1,269 | )
Adjustment for limited partners’ capital at redemption value |  |  | 77 |  |  |  | (77 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Amortization of unearned compensation |  |  | — |  |  |  | 3,313 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 3,313 |
Distributions to preferred unitholders |  |  | — |  |  |  | — |  |  |  | (922 | ) |  |  | — |  |  |  | — |  |  |  | (922 | )
Distributions to common unitholders ($0.96 per unit) |  |  | (3,912 | ) |  |  | (109,503 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (113,415 | )
Contribution from noncontrolling interest |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 955 |  |  |  | 955 |
CAPITAL BALANCE SEPTEMBER 30, 2019 |  | $ | 213,547 |  |  | $ | 5,964,932 |  |  | $ | 66,840 |  |  | $ | (15,339 | ) |  | $ | 6,611 |  |  | $ | 6,236,591 |
Changes in MAALP’s total capital and its components for the nine months ended September 30, 2020 and 2019 were as follows (dollars in thousands):
|  | Mid-America Apartments, L.P. Unitholders’ Capital |  |  |  |  |  |  |  |  |
|  | Limited Partners |  |  | General Partner |  |  | Preferred Units |  |  | Accumulated Other Comprehensive Loss |  |  | Noncontrolling Interests- Consolidated Real Estate Entities |  |  | Total Partnership Capital |
CAPITAL BALANCE DECEMBER 31, 2019 |  | $ | 214,647 |  |  | $ | 6,015,290 |  |  | $ | 66,840 |  |  | $ | (13,584 | ) |  | $ | 6,247 |  |  | $ | 6,289,440 |
Net income |  |  | 6,096 |  |  |  | 168,854 |  |  |  | 2,766 |  |  |  | — |  |  |  | — |  |  |  | 177,716 |
Other comprehensive income - derivative instruments |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 810 |  |  |  | — |  |  |  | 810 |
Issuance of units |  |  | — |  |  |  | (344 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (344 | )
Units repurchased and retired |  |  | — |  |  |  | (5,657 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (5,657 | )
Exercise of unit options |  |  | — |  |  |  | 71 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 71 |
General partnership units issued in exchange for limited partnership units |  |  | (471 | ) |  |  | 471 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Redeemable units fair market value adjustment |  |  | — |  |  |  | 1,659 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1,659 |
Adjustment for limited partners’ capital at redemption value |  |  | (216 | ) |  |  | 216 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Amortization of unearned compensation |  |  | — |  |  |  | 12,533 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 12,533 |
Distributions to preferred unitholders |  |  | — |  |  |  | — |  |  |  | (2,766 | ) |  |  | — |  |  |  | — |  |  |  | (2,766 | )
Distributions to common unitholders ($3.00 per unit) |  |  | (11,984 | ) |  |  | (343,106 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (355,090 | )
Contribution from noncontrolling interest |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 864 |  |  |  | 864 |
CAPITAL BALANCE SEPTEMBER 30, 2020 |  | $ | 208,072 |  |  | $ | 5,849,987 |  |  | $ | 66,840 |  |  | $ | (12,774 | ) |  | $ | 7,111 |  |  | $ | 6,119,236 |
|  | Mid-America Apartments, L.P. Unitholders’ Capital |  |  |  |  |  |  |  |  |
|  | Limited Partners |  |  | General Partner |  |  | Preferred Units |  |  | Accumulated Other Comprehensive Loss |  |  | 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 |  |  | 7,336 |  |  |  | 201,456 |  |  |  | 2,766 |  |  |  | — |  |  |  | — |  |  |  | 211,558 |
Other comprehensive loss - derivative instruments |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (15,178 | ) |  |  | — |  |  |  | (15,178 | )
Issuance of units |  |  | — |  |  |  | 750 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 750 |
Units repurchased and retired |  |  | — |  |  |  | (3,724 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (3,724 | )
Exercise of unit options |  |  | — |  |  |  | 1,036 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1,036 |
General partnership units issued in exchange for limited partnership units |  |  | (1,993 | ) |  |  | 1,993 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Units issued in exchange for redeemable units |  |  | — |  |  |  | 575 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 575 |
Redeemable units fair market value adjustment |  |  | — |  |  |  | (3,455 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (3,455 | )
Adjustment for limited partners’ capital at redemption value |  |  | (61 | ) |  |  | 61 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Amortization of unearned compensation |  |  | — |  |  |  | 11,550 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 11,550 |
Distributions to preferred unitholders |  |  | — |  |  |  | — |  |  |  | (2,766 | ) |  |  | — |  |  |  | — |  |  |  | (2,766 | )
Distributions to common unitholders ($2.88 per unit) |  |  | (11,778 | ) |  |  | (328,452 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (340,230 | )
Contribution from noncontrolling interest |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 4,305 |  |  |  | 4,305 |
CAPITAL BALANCE SEPTEMBER 30, 2019 |  | $ | 213,547 |  |  | $ | 5,964,932 |  |  | $ | 66,840 |  |  | $ | (15,339 | ) |  | $ | 6,611 |  |  | $ | 6,236,591 |

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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

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- Definition Partners' Capital [Table Text Block] + References No definition available. + Details
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Namespace Prefix: | maa_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration