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MAALP Capital (Tables) | 3 Months Ended
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Mar. 31, 2021
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 March 31, 2021 and 2020 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, 2020 |  | $ | 206,927 |  |  | $ | 5,817,270 |  |  | $ | 66,840 |  |  | $ | (12,496 | ) |  | $ | 9,848 |  |  | $ | 6,088,389 |
Net income |  |  | 1,671 |  |  |  | 46,271 |  |  |  | 922 |  |  |  | — |  |  |  | — |  |  |  | 48,864 |
Other comprehensive income - derivative instruments |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 279 |  |  |  | — |  |  |  | 279 |
Issuance of units |  |  | — |  |  |  | 134 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 134 |
Units repurchased and retired |  |  | — |  |  |  | (1,730 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (1,730 | )
Exercise of unit options |  |  | — |  |  |  | 1,466 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1,466 |
General partnership units issued in exchange for limited partnership units |  |  | (232 | ) |  |  | 232 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Redeemable units fair market value adjustment |  |  | — |  |  |  | (2,158 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (2,158 | )
Adjustment for limited partners’ capital at redemption value |  |  | 126 |  |  |  | (126 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Amortization of unearned compensation |  |  | — |  |  |  | 5,993 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 5,993 |
Distributions to preferred unitholders |  |  | — |  |  |  | — |  |  |  | (922 | ) |  |  | — |  |  |  | — |  |  |  | (922 | )
Distributions to common unitholders ($1.0250 per unit) |  |  | (4,156 | ) |  |  | (117,278 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (121,434 | )
Contribution from noncontrolling interest |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 633 |  |  |  | 633 |
CAPITAL BALANCE MARCH 31, 2021 |  | $ | 204,336 |  |  | $ | 5,750,074 |  |  | $ | 66,840 |  |  | $ | (12,217 | ) |  | $ | 10,481 |  |  | $ | 6,019,514 |
|  | 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 |  |  | 1,304 |  |  |  | 35,726 |  |  |  | 922 |  |  |  | — |  |  |  | — |  |  |  | 37,952 |
Other comprehensive income - derivative instruments |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 253 |  |  |  | — |  |  |  | 253 |
Issuance of units |  |  | — |  |  |  | 39 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 39 |
Units repurchased and retired |  |  | — |  |  |  | (1,727 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (1,727 | )
Exercise of unit options |  |  | — |  |  |  | 71 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 71 |
General partnership units issued in exchange for limited partnership units |  |  | (450 | ) |  |  | 450 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Redeemable units fair market value adjustment |  |  | — |  |  |  | 3,111 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 3,111 |
Adjustment for limited partners’ capital at redemption value |  |  | 56 |  |  |  | (56 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Amortization of unearned compensation |  |  | — |  |  |  | 5,289 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 5,289 |
Distributions to preferred unitholders |  |  | — |  |  |  | — |  |  |  | (922 | ) |  |  | — |  |  |  | — |  |  |  | (922 | )
Distributions to common unitholders ($1.0000 per unit) |  |  | (4,059 | ) |  |  | (114,302 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (118,361 | )
Contribution from noncontrolling interest |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 401 |  |  |  | 401 |
CAPITAL BALANCE MARCH 31, 2020 |  | $ | 211,498 |  |  | $ | 5,943,891 |  |  | $ | 66,840 |  |  | $ | (13,331 | ) |  | $ | 6,648 |  |  | $ | 6,215,546 |

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

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