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MAA Equity (Tables) | 9 Months Ended
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Sep. 30, 2020
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, 2020 and 2019 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, 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 ($1.00 per share) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (114,369 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (114,369 | )
Dividends on noncontrolling interests units ($1.00 per unit) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (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 |
|  | 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, 2019 |  | $ | 9 |  |  | $ | 1,138 |  |  | $ | 7,146,076 |  |  | $ | (1,086,665 | ) |  | $ | (9,092 | ) |  | $ | 215,404 |  |  | $ | 5,656 |  |  | $ | 6,272,526 |
Net income |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 78,645 |  |  |  | — |  |  |  | 2,814 |  |  |  | — |  |  |  | 81,459 |
Other comprehensive loss - derivative instruments |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (5,778 | ) |  |  | (195 | ) |  |  | — |  |  |  | (5,973 | )
Issuance and registration of common shares |  |  | — |  |  |  | — |  |  |  | 140 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 140 |
Exercise of stock options |  |  | — |  |  |  | — |  |  |  | (204 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (204 | )
Shares issued in exchange for common units |  |  | — |  |  |  | — |  |  |  | 836 |  |  |  | — |  |  |  | — |  |  |  | (836 | ) |  |  | — |  |  |  | — |
Redeemable stock fair market value adjustment |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (1,269 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (1,269 | )
Adjustment for noncontrolling interests in Operating Partnership |  |  | — |  |  |  | — |  |  |  | (272 | ) |  |  | — |  |  |  | — |  |  |  | 272 |  |  |  | — |  |  |  | — |
Amortization of unearned compensation |  |  | — |  |  |  | — |  |  |  | 3,313 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 3,313 |
Dividends on preferred stock |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (922 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (922 | )
Dividends on common stock ($0.96 per share) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (109,503 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (109,503 | )
Dividends on noncontrolling interests units ($0.96 per unit) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (3,912 | ) |  |  | — |  |  |  | (3,912 | )
Contribution from noncontrolling interest |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 955 |  |  |  | 955 |
EQUITY BALANCE SEPTEMBER 30, 2019 |  | $ | 9 |  |  | $ | 1,138 |  |  | $ | 7,149,889 |  |  | $ | (1,119,714 | ) |  | $ | (14,870 | ) |  | $ | 213,547 |  |  | $ | 6,611 |  |  | $ | 6,236,610 |
Changes in MAA’s total equity and its components for the nine months ended September 30, 2020 and 2019 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, 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 ($3.00 per share) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (343,106 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (343,106 | )
Dividends on noncontrolling interests units ($3.00 per unit) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (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 |
|  | 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, 2018 |  | $ | 9 |  |  | $ | 1,136 |  |  | $ | 7,138,170 |  |  | $ | (989,263 | ) |  | $ | (212 | ) |  | $ | 220,043 |  |  | $ | 2,306 |  |  | $ | 6,372,189 |
Net income |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 204,222 |  |  |  | — |  |  |  | 7,336 |  |  |  | — |  |  |  | 211,558 |
Other comprehensive loss - derivative instruments |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (14,658 | ) |  |  | (520 | ) |  |  | — |  |  |  | (15,178 | )
Issuance and registration of common shares |  |  | — |  |  |  | 2 |  |  |  | 748 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 750 |
Shares repurchased and retired |  |  | — |  |  |  | — |  |  |  | (3,724 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (3,724 | )
Exercise of stock options |  |  | — |  |  |  | — |  |  |  | 1,036 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1,036 |
Shares issued in exchange for common units |  |  | — |  |  |  | — |  |  |  | 1,993 |  |  |  | — |  |  |  | — |  |  |  | (1,993 | ) |  |  | — |  |  |  | — |
Shares issued in exchange for redeemable stock |  |  | — |  |  |  | — |  |  |  | 575 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 575 |
Redeemable stock fair market value adjustment |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (3,455 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (3,455 | )
Adjustment for noncontrolling interests in Operating Partnership |  |  | — |  |  |  | — |  |  |  | (459 | ) |  |  | — |  |  |  | — |  |  |  | 459 |  |  |  | — |  |  |  | — |
Amortization of unearned compensation |  |  | — |  |  |  | — |  |  |  | 11,550 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 11,550 |
Dividends on preferred stock |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (2,766 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (2,766 | )
Dividends on common stock ($2.88 per share) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (328,452 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (328,452 | )
Dividends on noncontrolling interests units ($2.88 per unit) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (11,778 | ) |  |  | — |  |  |  | (11,778 | )
Contribution from noncontrolling interest |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 4,305 |  |  |  | 4,305 |
EQUITY BALANCE SEPTEMBER 30, 2019 |  | $ | 9 |  |  | $ | 1,138 |  |  | $ | 7,149,889 |  |  | $ | (1,119,714 | ) |  | $ | (14,870 | ) |  | $ | 213,547 |  |  | $ | 6,611 |  |  | $ | 6,236,610 |

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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: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration