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MAA Equity (Tables) | 6 Months Ended
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Jun. 30, 2022
M A A Equity [Abstract] |
Summary of Changes in Total Equity and its Components | Changes in MAA’s total equity and its components for the three months ended June 30, 2022 and 2021 were as follows (dollars in thousands):
|  | Mid-America Apartment Communities, Inc. Shareholders’ Equity |  |  |  |  |  |  |  |  |  |
|  | Preferred Stock |  |  | Common Stock |  |  | Additional Paid-In Capital |  |  | Accumulated Distributions in Excess of Net Income |  |  | Accumulated Other Comprehensive Loss |  |  | Noncontrolling Interests - Operating Partnership |  |  | Noncontrolling Interests - Consolidated Real Estate Entities |  |  | Total Equity |
EQUITY BALANCE MARCH 31, 2022 |  | $ | 9 |  |  | $ | 1,151 |  |  | $ | 7,198,474 |  |  | $ | (1,268,827 | ) |  | $ | (10,860 | ) |  | $ | 163,566 |  |  | $ | 19,849 |  |  | $ | 6,103,362 |
Net income |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 210,702 |  |  |  | — |  |  |  | 5,858 |  |  |  | — |  |  |  | 216,560 |
Other comprehensive income - derivative instruments |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 269 |  |  |  | 8 |  |  |  | — |  |  |  | 277 |
Issuance and registration of common shares |  |  | — |  |  |  | 1 |  |  |  | (454 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (453 | )
Shares repurchased and retired |  |  | — |  |  |  | — |  |  |  | (10,869 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (10,869 | )
Redeemable stock fair market value adjustment |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 4,227 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 4,227 |
Adjustment for noncontrolling interests in Operating Partnership |  |  | — |  |  |  | — |  |  |  | 368 |  |  |  | — |  |  |  | — |  |  |  | (368 | ) |  |  | — |  |  |  | — |
Amortization of unearned compensation |  |  | — |  |  |  | — |  |  |  | 4,401 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 4,401 |
Dividends on preferred stock |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (922 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (922 | )
Dividends on common stock ($1.2500 per share) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (144,396 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (144,396 | )
Dividends on noncontrolling interests units ($1.2500 per share) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (4,002 | ) |  |  | — |  |  |  | (4,002 | )
Distribution to noncontrolling interest |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (69 | ) |  |  | (69 | )
EQUITY BALANCE JUNE 30, 2022 |  | $ | 9 |  |  | $ | 1,152 |  |  | $ | 7,191,920 |  |  | $ | (1,199,216 | ) |  | $ | (10,591 | ) |  | $ | 165,062 |  |  | $ | 19,780 |  |  | $ | 6,168,116 |
|  | Mid-America Apartment Communities, Inc. Shareholders’ Equity |  |  |  |  |  |  |  |  |  |
|  | Preferred Stock |  |  | Common Stock |  |  | Additional Paid-In Capital |  |  | Accumulated Distributions in Excess of Net Income |  |  | Accumulated Other Comprehensive Loss |  |  | Noncontrolling Interests - Operating Partnership |  |  | Noncontrolling Interests - Consolidated Real Estate Entities |  |  | Total Equity |
EQUITY BALANCE MARCH 31, 2021 |  | $ | 9 |  |  | $ | 1,142 |  |  | $ | 7,182,771 |  |  | $ | (1,367,347 | ) |  | $ | (11,859 | ) |  | $ | 204,336 |  |  | $ | 10,481 |  |  | $ | 6,019,533 |
Net income |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 216,478 |  |  |  | — |  |  |  | 7,397 |  |  |  | — |  |  |  | 223,875 |
Other comprehensive income - derivative instruments |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 227 |  |  |  | 51 |  |  |  | — |  |  |  | 278 |
Issuance and registration of common shares |  |  | — |  |  |  | 1 |  |  |  | (468 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (467 | )
Shares repurchased and retired |  |  | — |  |  |  | — |  |  |  | (7,313 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (7,313 | )
Shares issued in exchange for common units |  |  | — |  |  |  | 4 |  |  |  | 21,928 |  |  |  | — |  |  |  | — |  |  |  | (21,932 | ) |  |  | — |  |  |  | — |
Redeemable stock fair market value adjustment |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (3,031 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (3,031 | )
Adjustment for noncontrolling interests in Operating Partnership |  |  | — |  |  |  | — |  |  |  | 816 |  |  |  | — |  |  |  | — |  |  |  | (816 | ) |  |  | — |  |  |  | — |
Amortization of unearned compensation |  |  | — |  |  |  | — |  |  |  | 4,151 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 4,151 |
Dividends on preferred stock |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (922 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (922 | )
Dividends on common stock ($1.0250 per share) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (117,872 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (117,872 | )
Dividends on noncontrolling interests units ($1.0250 per share) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (3,696 | ) |  |  | — |  |  |  | (3,696 | )
Contribution from noncontrolling interest |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 6,131 |  |  |  | 6,131 |
EQUITY BALANCE JUNE 30, 2021 |  | $ | 9 |  |  | $ | 1,147 |  |  | $ | 7,201,885 |  |  | $ | (1,272,694 | ) |  | $ | (11,632 | ) |  | $ | 185,340 |  |  | $ | 16,612 |  |  | $ | 6,120,667 |
Changes in MAA’s total equity and its components for the six months ended June 30, 2022 and 2021 were as follows (dollars in thousands):
|  | Mid-America Apartment Communities, Inc. Shareholders’ Equity |  |  |  |  |  |  |  |  |  |
|  | Preferred Stock |  |  | Common Stock |  |  | Additional Paid-In Capital |  |  | Accumulated Distributions in Excess of Net Income |  |  | Accumulated Other Comprehensive Loss |  |  | Noncontrolling Interests - Operating Partnership |  |  | Noncontrolling Interests - Consolidated Real Estate Entities |  |  | Total Equity |
EQUITY BALANCE DECEMBER 31, 2021 |  | $ | 9 |  |  | $ | 1,151 |  |  | $ | 7,230,956 |  |  | $ | (1,255,807 | ) |  | $ | (11,132 | ) |  | $ | 165,116 |  |  | $ | 23,614 |  |  | $ | 6,153,907 |
Net income (loss) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 321,504 |  |  |  | — |  |  |  | 8,926 |  |  |  | (293 | ) |  |  | 330,137 |
Other comprehensive income - derivative instruments |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 541 |  |  |  | 15 |  |  |  | — |  |  |  | 556 |
Issuance and registration of common shares |  |  | — |  |  |  | 1 |  |  |  | (433 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (432 | )
Shares repurchased and retired |  |  | — |  |  |  | — |  |  |  | (14,031 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (14,031 | )
Exercise of stock options |  |  | — |  |  |  | — |  |  |  | 28 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 28 |
Shares issued in exchange for common units |  |  | — |  |  |  | — |  |  |  | 193 |  |  |  | — |  |  |  | — |  |  |  | (193 | ) |  |  | — |  |  |  | — |
Redeemable stock fair market value adjustment |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 6,760 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 6,760 |
Adjustment for noncontrolling interests in Operating Partnership |  |  | — |  |  |  | — |  |  |  | 1,321 |  |  |  | — |  |  |  | — |  |  |  | (1,321 | ) |  |  | — |  |  |  | — |
Amortization of unearned compensation |  |  | — |  |  |  | — |  |  |  | 11,329 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 11,329 |
Dividends on preferred stock |  |  | — |  |  |  | — |  |  |  |  |  |  | (1,844 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (1,844 | )
Dividends on common stock ($2.3375 per share) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (269,829 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (269,829 | )
Dividends on noncontrolling interests units ($2.3375 per share) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (7,481 | ) |  |  | — |  |  |  | (7,481 | )
Acquisition of noncontrolling interest |  |  | — |  |  |  | — |  |  |  | (37,443 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (5,627 | ) |  |  | (43,070 | )
Contribution from noncontrolling interest |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 2,086 |  |  |  | 2,086 |
EQUITY BALANCE JUNE 30, 2022 |  | $ | 9 |  |  | $ | 1,152 |  |  | $ | 7,191,920 |  |  | $ | (1,199,216 | ) |  | $ | (10,591 | ) |  | $ | 165,062 |  |  | $ | 19,780 |  |  | $ | 6,168,116 |
|  | Mid-America Apartment Communities, Inc. Shareholders’ Equity |  |  |  |  |  |  |  |  |  |
|  | Preferred Stock |  |  | Common Stock |  |  | Additional Paid-In Capital |  |  | Accumulated Distributions in Excess of Net Income |  |  | Accumulated Other Comprehensive Loss |  |  | Noncontrolling Interests - Operating Partnership |  |  | Noncontrolling Interests - Consolidated Real Estate Entities |  |  | Total Equity |
EQUITY BALANCE DECEMBER 31, 2020 |  | $ | 9 |  |  | $ | 1,141 |  |  | $ | 7,176,793 |  |  | $ | (1,294,182 | ) |  | $ | (12,128 | ) |  | $ | 206,927 |  |  | $ | 9,848 |  |  | $ | 6,088,408 |
Net income |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 263,671 |  |  |  | — |  |  |  | 9,068 |  |  |  | — |  |  |  | 272,739 |
Other comprehensive income - derivative instruments |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 496 |  |  |  | 61 |  |  |  | — |  |  |  | 557 |
Issuance and registration of common shares |  |  | — |  |  |  | 2 |  |  |  | (335 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (333 | )
Shares repurchased and retired |  |  | — |  |  |  | — |  |  |  | (9,043 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (9,043 | )
Exercise of stock options |  |  | — |  |  |  | — |  |  |  | 1,466 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1,466 |
Shares issued in exchange for common units |  |  | — |  |  |  | 4 |  |  |  | 22,160 |  |  |  | — |  |  |  | — |  |  |  | (22,164 | ) |  |  | — |  |  |  | — |
Redeemable stock fair market value adjustment |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (5,189 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (5,189 | )
Adjustment for noncontrolling interests in Operating Partnership |  |  | — |  |  |  | — |  |  |  | 700 |  |  |  | — |  |  |  | — |  |  |  | (700 | ) |  |  | — |  |  |  | — |
Amortization of unearned compensation |  |  | — |  |  |  | — |  |  |  | 10,144 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 10,144 |
Dividends on preferred stock |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (1,844 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (1,844 | )
Dividends on common stock ($2.0500 per share) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (235,150 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (235,150 | )
Dividends on noncontrolling interests units ($2.0500 per share) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (7,852 | ) |  |  | — |  |  |  | (7,852 | )
Contribution from noncontrolling interest |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 6,764 |  |  |  | 6,764 |
EQUITY BALANCE JUNE 30, 2021 |  | $ | 9 |  |  | $ | 1,147 |  |  | $ | 7,201,885 |  |  | $ | (1,272,694 | ) |  | $ | (11,632 | ) |  | $ | 185,340 |  |  | $ | 16,612 |  |  | $ | 6,120,667 |

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- Definition MAA Equity. + References No definition available. + Details
Name: | maa_MAAEquityAbstract
Namespace Prefix: | maa_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Shareholders' Equity [Table Text Block] + References No definition available. + Details
Name: | maa_ShareholdersEquityTableTextBlock
Namespace Prefix: | maa_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration