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MAA Equity (Tables) | 9 Months Ended
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Sep. 30, 2021
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, 2021 and 2020 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, 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 ($1.025 per share) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (118,018 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (118,018 | )
Dividends on noncontrolling interests units ($1.025 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 |
|  | 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, 2020 |  | $ | 9 |  |  | $ | 1,140 |  |  | $ | 7,168,886 |  |  | $ | (1,202,536 | ) |  | $ | (12,665 | ) |  | $ | 209,894 |  |  | $ | 6,849 |  |  | $ | 6,171,577 |
Net income |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 59,910 |  |  |  | — |  |  |  | 2,126 |  |  |  | — |  |  |  | 62,036 |
Other comprehensive income - derivative instruments |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 269 |  |  |  | 10 |  |  |  | — |  |  |  | 279 |
Issuance and registration of common shares |  |  | — |  |  |  | — |  |  |  | 33 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 33 |
Shares issued in exchange for common units |  |  | — |  |  |  | — |  |  |  | 21 |  |  |  | — |  |  |  | — |  |  |  | (21 | ) |  |  | — |  |  |  | — |
Redeemable stock fair market value adjustment |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (155 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (155 | )
Adjustment for noncontrolling interests in Operating Partnership |  |  | — |  |  |  | — |  |  |  | 71 |  |  |  | — |  |  |  | — |  |  |  | (71 | ) |  |  | — |  |  |  | — |
Amortization of unearned compensation |  |  | — |  |  |  | — |  |  |  | 4,380 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 4,380 |
Dividends on preferred stock |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (922 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (922 | )
Dividends on common stock ($1.000 per share) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (114,369 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (114,369 | )
Dividends on noncontrolling interests units ($1.000 per share) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (3,866 | ) |  |  | — |  |  |  | (3,866 | )
Contribution from noncontrolling interest |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 262 |  |  |  | 262 |
EQUITY BALANCE SEPTEMBER 30, 2020 |  | $ | 9 |  |  | $ | 1,140 |  |  | $ | 7,173,391 |  |  | $ | (1,258,072 | ) |  | $ | (12,396 | ) |  | $ | 208,072 |  |  | $ | 7,111 |  |  | $ | 6,119,255 |
Changes in MAA’s total equity and its components for the nine months ended September 30, 2021 and 2020 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, 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 ($3.075 per share) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (353,168 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (353,168 | )
Dividends on noncontrolling interests units ($3.075 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 |
|  | 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, 2019 |  | $ | 9 |  |  | $ | 1,140 |  |  | $ | 7,166,073 |  |  | $ | (1,085,479 | ) |  | $ | (13,178 | ) |  | $ | 214,647 |  |  | $ | 6,247 |  |  | $ | 6,289,459 |
Net income |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 171,620 |  |  |  | — |  |  |  | 6,096 |  |  |  | — |  |  |  | 177,716 |
Other comprehensive income - derivative instruments |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 782 |  |  |  | 28 |  |  |  | — |  |  |  | 810 |
Issuance and registration of common shares |  |  | — |  |  |  | — |  |  |  | (344 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (344 | )
Shares repurchased and retired |  |  | — |  |  |  | — |  |  |  | (5,657 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (5,657 | )
Exercise of stock options |  |  | — |  |  |  | — |  |  |  | 71 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 71 |
Shares issued in exchange for common units |  |  | — |  |  |  | — |  |  |  | 471 |  |  |  | — |  |  |  | — |  |  |  | (471 | ) |  |  | — |  |  |  | — |
Redeemable stock fair market value adjustment |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1,659 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1,659 |
Adjustment for noncontrolling interests in Operating Partnership |  |  | — |  |  |  | — |  |  |  | 244 |  |  |  | — |  |  |  | — |  |  |  | (244 | ) |  |  | — |  |  |  | — |
Amortization of unearned compensation |  |  | — |  |  |  | — |  |  |  | 12,533 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 12,533 |
Dividends on preferred stock |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (2,766 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (2,766 | )
Dividends on common stock ($3.000 per share) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (343,106 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (343,106 | )
Dividends on noncontrolling interests units ($3.000 per share) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (11,984 | ) |  |  | — |  |  |  | (11,984 | )
Contribution from noncontrolling interest |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 864 |  |  |  | 864 |
EQUITY BALANCE SEPTEMBER 30, 2020 |  | $ | 9 |  |  | $ | 1,140 |  |  | $ | 7,173,391 |  |  | $ | (1,258,072 | ) |  | $ | (12,396 | ) |  | $ | 208,072 |  |  | $ | 7,111 |  |  | $ | 6,119,255 |

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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