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MAALP Capital (Tables) | 6 Months Ended
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Jun. 30, 2022
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 June 30, 2022 and 2021 were as follows (dollars in thousands):
|  | Mid-America Apartments, L.P. Unitholders’ Capital |  |  |  |  |  |  |
|  | Preferred Units |  |  | General Partner |  |  | Limited Partners |  |  | Accumulated Other Comprehensive Loss |  |  | Noncontrolling Interests - Consolidated Real Estate Entities |  |  | Total Partnership Capital |
CAPITAL BALANCE MARCH 31, 2022 |  | $ | 66,840 |  |  | $ | 5,864,191 |  |  | $ | 163,566 |  |  | $ | (11,103 | ) |  | $ | 19,849 |  |  | $ | 6,103,343 |
Net income |  |  | 922 |  |  |  | 209,780 |  |  |  | 5,858 |  |  |  | — |  |  |  | — |  |  |  | 216,560 |
Other comprehensive income - derivative instruments |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 277 |  |  |  | — |  |  |  | 277 |
Issuance of units |  |  | — |  |  |  | (453 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (453 | )
Units repurchased and retired |  |  | — |  |  |  | (10,869 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (10,869 | )
Redeemable units fair market value adjustment |  |  | — |  |  |  | 4,227 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 4,227 |
Adjustment for limited partners’ capital at redemption value |  |  | — |  |  |  | 360 |  |  |  | (360 | ) |  |  | — |  |  |  | — |  |  |  | — |
Amortization of unearned compensation |  |  | — |  |  |  | 4,401 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 4,401 |
Distributions to preferred unitholders |  |  | (922 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (922 | )
Distributions to common unitholders ($1.2500 per unit) |  |  | — |  |  |  | (144,396 | ) |  |  | (4,002 | ) |  |  | — |  |  |  | — |  |  |  | (148,398 | )
Distribution to noncontrolling interest |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (69 | ) |  |  | (69 | )
CAPITAL BALANCE JUNE 30, 2022 |  | $ | 66,840 |  |  | $ | 5,927,241 |  |  | $ | 165,062 |  |  | $ | (10,826 | ) |  | $ | 19,780 |  |  | $ | 6,168,097 |
|  | Mid-America Apartments, L.P. Unitholders’ Capital |  |  |  |  |  |  |
|  | Preferred Units |  |  | General Partner |  |  | Limited Partners |  |  | Accumulated Other Comprehensive Loss |  |  | Noncontrolling Interests - Consolidated Real Estate Entities |  |  | Total Partnership Capital |
CAPITAL BALANCE MARCH 31, 2021 |  | $ | 66,840 |  |  | $ | 5,750,074 |  |  | $ | 204,336 |  |  | $ | (12,217 | ) |  | $ | 10,481 |  |  | $ | 6,019,514 |
Net income |  |  | 922 |  |  |  | 215,556 |  |  |  | 7,397 |  |  |  | — |  |  |  | — |  |  |  | 223,875 |
Other comprehensive income - derivative instruments |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 278 |  |  |  | — |  |  |  | 278 |
Issuance of units |  |  | — |  |  |  | (467 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (467 | )
Units repurchased and retired |  |  | — |  |  |  | (7,313 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (7,313 | )
General partnership units issued in exchange for limited partnership units |  |  | — |  |  |  | 21,932 |  |  |  | (21,932 | ) |  |  | — |  |  |  | — |  |  |  | — |
Redeemable units fair market value adjustment |  |  | — |  |  |  | (3,031 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (3,031 | )
Adjustment for limited partners’ capital at redemption value |  |  | — |  |  |  | 765 |  |  |  | (765 | ) |  |  | — |  |  |  | — |  |  |  | — |
Amortization of unearned compensation |  |  | — |  |  |  | 4,151 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 4,151 |
Distributions to preferred unitholders |  |  | (922 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (922 | )
Distributions to common unitholders ($1.0250 per unit) |  |  | — |  |  |  | (117,872 | ) |  |  | (3,696 | ) |  |  | — |  |  |  | — |  |  |  | (121,568 | )
Contribution from noncontrolling interest |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 6,131 |  |  |  | 6,131 |
CAPITAL BALANCE JUNE 30, 2021 |  | $ | 66,840 |  |  | $ | 5,863,795 |  |  | $ | 185,340 |  |  | $ | (11,939 | ) |  | $ | 16,612 |  |  | $ | 6,120,648 |
Changes in MAALP’s total capital and its components for the six months ended June 30, 2022 and 2021 were as follows (dollars in thousands):
|  | Mid-America Apartments, L.P. Unitholders’ Capital |  |  |  |  |  |  |
|  | Preferred Units |  |  | General Partner |  |  | Limited Partners |  |  | Accumulated Other Comprehensive Loss |  |  | Noncontrolling Interests - Consolidated Real Estate Entities |  |  | Total Partnership Capital |
CAPITAL BALANCE DECEMBER 31, 2021 |  | $ | 66,840 |  |  | $ | 5,909,700 |  |  | $ | 165,116 |  |  | $ | (11,382 | ) |  | $ | 23,614 |  |  | $ | 6,153,888 |
Net income (loss) |  |  | 1,844 |  |  |  | 319,660 |  |  |  | 8,926 |  |  |  | — |  |  |  | (293 | ) |  |  | 330,137 |
Other comprehensive income - derivative instruments |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 556 |  |  |  | — |  |  |  | 556 |
Issuance of units |  |  | — |  |  |  | (432 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (432 | )
Units repurchased and retired |  |  | — |  |  |  | (14,031 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (14,031 | )
Exercise of unit options |  |  | — |  |  |  | 28 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 28 |
General partnership units issued in exchange for limited partnership units |  |  | — |  |  |  | 193 |  |  |  | (193 | ) |  |  | — |  |  |  | — |  |  |  | — |
Redeemable units fair market value adjustment |  |  | — |  |  |  | 6,760 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 6,760 |
Adjustment for limited partners’ capital at redemption value |  |  | — |  |  |  | 1,306 |  |  |  | (1,306 | ) |  |  | — |  |  |  | — |  |  |  | — |
Amortization of unearned compensation |  |  | — |  |  |  | 11,329 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 11,329 |
Distributions to preferred unitholders |  |  | (1,844 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (1,844 | )
Distributions to common unitholders ($2.3375 per unit) |  |  | — |  |  |  | (269,829 | ) |  |  | (7,481 | ) |  |  | — |  |  |  | — |  |  |  | (277,310 | )
Acquisition of noncontrolling interest |  |  | — |  |  |  | (37,443 | ) |  |  | — |  |  |  | — |  |  |  | (5,627 | ) |  |  | (43,070 | )
Contribution from noncontrolling interest |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 2,086 |  |  |  | 2,086 |
CAPITAL BALANCE JUNE 30, 2022 |  | $ | 66,840 |  |  | $ | 5,927,241 |  |  | $ | 165,062 |  |  | $ | (10,826 | ) |  | $ | 19,780 |  |  | $ | 6,168,097 |
|  | Mid-America Apartments, L.P. Unitholders’ Capital |  |  |  |  |  |  |
|  | Preferred Units |  |  | General Partner |  |  | Limited Partners |  |  | Accumulated Other Comprehensive Loss |  |  | Noncontrolling Interests - Consolidated Real Estate Entities |  |  | Total Partnership Capital |
CAPITAL BALANCE DECEMBER 31, 2020 |  | $ | 66,840 |  |  | $ | 5,817,270 |  |  | $ | 206,927 |  |  | $ | (12,496 | ) |  | $ | 9,848 |  |  | $ | 6,088,389 |
Net income |  |  | 1,844 |  |  |  | 261,827 |  |  |  | 9,068 |  |  |  | — |  |  |  | — |  |  |  | 272,739 |
Other comprehensive income - derivative instruments |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 557 |  |  |  | — |  |  |  | 557 |
Issuance of units |  |  | — |  |  |  | (333 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (333 | )
Units repurchased and retired |  |  | — |  |  |  | (9,043 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (9,043 | )
Exercise of unit options |  |  | — |  |  |  | 1,466 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1,466 |
General partnership units issued in exchange for limited partnership units |  |  | — |  |  |  | 22,164 |  |  |  | (22,164 | ) |  |  | — |  |  |  | — |  |  |  | — |
Redeemable units fair market value adjustment |  |  | — |  |  |  | (5,189 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (5,189 | )
Adjustment for limited partners’ capital at redemption value |  |  | — |  |  |  | 639 |  |  |  | (639 | ) |  |  | — |  |  |  | — |  |  |  | — |
Amortization of unearned compensation |  |  | — |  |  |  | 10,144 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 10,144 |
Distributions to preferred unitholders |  |  | (1,844 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (1,844 | )
Distributions to common unitholders ($2.0500 per unit) |  |  | — |  |  |  | (235,150 | ) |  |  | (7,852 | ) |  |  | — |  |  |  | — |  |  |  | (243,002 | )
Contribution from noncontrolling interest |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 6,764 |  |  |  | 6,764 |
CAPITAL BALANCE JUNE 30, 2021 |  | $ | 66,840 |  |  | $ | 5,863,795 |  |  | $ | 185,340 |  |  | $ | (11,939 | ) |  | $ | 16,612 |  |  | $ | 6,120,648 |

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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: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration