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MAA Equity (Tables) | 9 Months Ended
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Sep. 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 September 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 JUNE 30, 2022 |  | $ | 9 |  |  | $ | 1,152 |  |  | $ | 7,191,920 |  |  | $ | (1,199,216 | ) |  | $ | (10,591 | ) |  | $ | 165,062 |  |  | $ | 19,780 |  |  | $ | 6,168,116 |
Net income |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 122,311 |  |  |  | — |  |  |  | 3,392 |  |  |  | — |  |  |  | 125,703 |
Other comprehensive income - derivative instruments |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 270 |  |  |  | 9 |  |  |  | — |  |  |  | 279 |
Issuance and registration of common shares |  |  | — |  |  |  | — |  |  |  | 156 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 156 |
Shares repurchased and retired |  |  | — |  |  |  | — |  |  |  | (12 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (12 | )
Shares issued in exchange for common units |  |  | — |  |  |  | — |  |  |  | 307 |  |  |  | — |  |  |  | — |  |  |  | (307 | ) |  |  | — |  |  |  | — |
Redeemable stock fair market value adjustment |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 2,537 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 2,537 |
Adjustment for noncontrolling interests in Operating Partnership |  |  | — |  |  |  | — |  |  |  | (70 | ) |  |  | — |  |  |  | — |  |  |  | 70 |  |  |  | — |  |  |  | — |
Amortization of unearned compensation |  |  | — |  |  |  | — |  |  |  | 4,203 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 4,203 |
Dividends on preferred stock |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (922 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (922 | )
Dividends on common stock ($1.2500 per share) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (144,309 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (144,309 | )
Dividends on noncontrolling interests units ($1.2500 per share) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (3,996 | ) |  |  | — |  |  |  | (3,996 | )
EQUITY BALANCE SEPTEMBER 30, 2022 |  | $ | 9 |  |  | $ | 1,152 |  |  | $ | 7,196,504 |  |  | $ | (1,219,599 | ) |  | $ | (10,321 | ) |  | $ | 164,230 |  |  | $ | 19,780 |  |  | $ | 6,151,755 |
|  | 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 JUNE 30, 2021 |  | $ | 9 |  |  | $ | 1,147 |  |  | $ | 7,201,885 |  |  | $ | (1,272,694 | ) |  | $ | (11,632 | ) |  | $ | 185,340 |  |  | $ | 16,612 |  |  | $ | 6,120,667 |
Net income |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 84,479 |  |  |  | — |  |  |  | 2,568 |  |  |  | — |  |  |  | 87,047 |
Other comprehensive income - derivative instruments |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 248 |  |  |  | 30 |  |  |  | — |  |  |  | 278 |
Issuance and registration of common shares |  |  | — |  |  |  | — |  |  |  | (103 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (103 | )
Exercise of stock options |  |  | — |  |  |  | — |  |  |  | 12 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 12 |
Shares issued in exchange for common units |  |  | — |  |  |  | 2 |  |  |  | 11,106 |  |  |  | — |  |  |  | — |  |  |  | (11,108 | ) |  |  | — |  |  |  | — |
Redeemable stock fair market value adjustment |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (2,356 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (2,356 | )
Adjustment for noncontrolling interests in Operating Partnership |  |  | — |  |  |  | — |  |  |  | (22 | ) |  |  | — |  |  |  | — |  |  |  | 22 |  |  |  | — |  |  |  | — |
Amortization of unearned compensation |  |  | — |  |  |  | — |  |  |  | 4,007 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 4,007 |
Dividends on preferred stock |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (922 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (922 | )
Dividends on common stock ($1.0250 per share) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (118,018 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (118,018 | )
Dividends on noncontrolling interests units ($1.0250 per share) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (3,486 | ) |  |  | — |  |  |  | (3,486 | )
Contribution from noncontrolling interest |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 3,204 |  |  |  | 3,204 |
EQUITY BALANCE SEPTEMBER 30, 2021 |  | $ | 9 |  |  | $ | 1,149 |  |  | $ | 7,216,885 |  |  | $ | (1,309,511 | ) |  | $ | (11,384 | ) |  | $ | 173,366 |  |  | $ | 19,816 |  |  | $ | 6,090,330 |
Changes in MAA’s total equity and its components for the nine months ended September 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) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 443,815 |  |  |  | — |  |  |  | 12,318 |  |  |  | (293 | ) |  |  | 455,840 |
Other comprehensive income - derivative instruments |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 811 |  |  |  | 24 |  |  |  | — |  |  |  | 835 |
Issuance and registration of common shares |  |  | — |  |  |  | 1 |  |  |  | (277 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (276 | )
Shares repurchased and retired |  |  | — |  |  |  | — |  |  |  | (14,043 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (14,043 | )
Exercise of stock options |  |  | — |  |  |  | — |  |  |  | 28 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 28 |
Shares issued in exchange for common units |  |  | — |  |  |  | — |  |  |  | 500 |  |  |  | — |  |  |  | — |  |  |  | (500 | ) |  |  | — |  |  |  | — |
Redeemable stock fair market value adjustment |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 9,297 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 9,297 |
Adjustment for noncontrolling interests in Operating Partnership |  |  | — |  |  |  | — |  |  |  | 1,251 |  |  |  | — |  |  |  | — |  |  |  | (1,251 | ) |  |  | — |  |  |  | — |
Amortization of unearned compensation |  |  | — |  |  |  | — |  |  |  | 15,532 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 15,532 |
Dividends on preferred stock |  |  | — |  |  |  | — |  |  |  |  |  |  | (2,766 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (2,766 | )
Dividends on common stock ($3.5875 per share) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (414,138 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (414,138 | )
Dividends on noncontrolling interests units ($3.5875 per share) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (11,477 | ) |  |  | — |  |  |  | (11,477 | )
Acquisition of noncontrolling interest |  |  | — |  |  |  | — |  |  |  | (37,443 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (5,627 | ) |  |  | (43,070 | )
Contribution from noncontrolling interest |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 2,086 |  |  |  | 2,086 |
EQUITY BALANCE SEPTEMBER 30, 2022 |  | $ | 9 |  |  | $ | 1,152 |  |  | $ | 7,196,504 |  |  | $ | (1,219,599 | ) |  | $ | (10,321 | ) |  | $ | 164,230 |  |  | $ | 19,780 |  |  | $ | 6,151,755 |
|  | 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 |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 348,150 |  |  |  | — |  |  |  | 11,636 |  |  |  | — |  |  |  | 359,786 |
Other comprehensive income - derivative instruments |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 744 |  |  |  | 91 |  |  |  | — |  |  |  | 835 |
Issuance and registration of common shares |  |  | — |  |  |  | 2 |  |  |  | (438 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (436 | )
Shares repurchased and retired |  |  | — |  |  |  | — |  |  |  | (9,043 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (9,043 | )
Exercise of stock options |  |  | — |  |  |  | — |  |  |  | 1,478 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1,478 |
Shares issued in exchange for common units |  |  | — |  |  |  | 6 |  |  |  | 33,266 |  |  |  | — |  |  |  | — |  |  |  | (33,272 | ) |  |  | — |  |  |  | — |
Redeemable stock fair market value adjustment |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (7,545 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (7,545 | )
Adjustment for noncontrolling interests in Operating Partnership |  |  | — |  |  |  | — |  |  |  | 678 |  |  |  | — |  |  |  | — |  |  |  | (678 | ) |  |  | — |  |  |  | — |
Amortization of unearned compensation |  |  | — |  |  |  | — |  |  |  | 14,151 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 14,151 |
Dividends on preferred stock |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (2,766 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (2,766 | )
Dividends on common stock ($3.0750 per share) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (353,168 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (353,168 | )
Dividends on noncontrolling interests units ($3.0750 per share) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (11,338 | ) |  |  | — |  |  |  | (11,338 | )
Contribution from noncontrolling interest |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 9,968 |  |  |  | 9,968 |
EQUITY BALANCE SEPTEMBER 30, 2021 |  | $ | 9 |  |  | $ | 1,149 |  |  | $ | 7,216,885 |  |  | $ | (1,309,511 | ) |  | $ | (11,384 | ) |  | $ | 173,366 |  |  | $ | 19,816 |  |  | $ | 6,090,330 |

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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