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MAA Equity (Tables) | 6 Months Ended
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Jun. 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 June 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 MARCH 31, 2020 |  | $ | 9 |  |  | $ | 1,140 |  |  | $ | 7,170,148 |  |  | $ | (1,160,944 | ) |  | $ | (12,934 | ) |  | $ | 211,498 |  |  | $ | 6,648 |  |  | $ | 6,215,565 |
Net income |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 75,062 |  |  |  | — |  |  |  | 2,666 |  |  |  | — |  |  |  | 77,728 |
Other comprehensive income - derivative instruments |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 269 |  |  |  | 9 |  |  |  | — |  |  |  | 278 |
Issuance and registration of common shares |  |  | — |  |  |  | — |  |  |  | (416 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (416 | )
Shares repurchased and retired |  |  | — |  |  |  | — |  |  |  | (3,930 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (3,930 | )
Exercise of stock options |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Redeemable stock fair market value adjustment |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (1,297 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (1,297 | )
Adjustment for noncontrolling interests in Operating Partnership |  |  | — |  |  |  | — |  |  |  | 220 |  |  |  | — |  |  |  | — |  |  |  | (220 | ) |  |  | — |  |  |  | — |
Amortization of unearned compensation |  |  | — |  |  |  | — |  |  |  | 2,864 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 2,864 |
Dividends on preferred stock |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (922 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (922 | )
Dividends on common stock ($1.00 per share) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (114,435 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (114,435 | )
Dividends on noncontrolling interests units ($1.00 per unit) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (4,059 | ) |  |  | — |  |  |  | (4,059 | )
Contribution from noncontrolling interest |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 201 |  |  |  | 201 |
EQUITY BALANCE JUNE 30, 2020 |  | $ | 9 |  |  | $ | 1,140 |  |  | $ | 7,168,886 |  |  | $ | (1,202,536 | ) |  | $ | (12,665 | ) |  | $ | 209,894 |  |  | $ | 6,849 |  |  | $ | 6,171,577 |
|  | 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, 2019 |  | $ | 9 |  |  | $ | 1,137 |  |  | $ | 7,141,544 |  |  | $ | (1,037,268 | ) |  | $ | (3,300 | ) |  | $ | 218,011 |  |  | $ | 5,166 |  |  | $ | 6,325,299 |
Net income |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 61,917 |  |  |  | — |  |  |  | 2,224 |  |  |  | — |  |  |  | 64,141 |
Other comprehensive loss - derivative instruments |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (5,792 | ) |  |  | (212 | ) |  |  | — |  |  |  | (6,004 | )
Issuance and registration of common shares |  |  | — |  |  |  | 1 |  |  |  | (520 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (519 | )
Shares repurchased and retired |  |  | — |  |  |  | — |  |  |  | (701 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (701 | )
Exercise of stock options |  |  | — |  |  |  | — |  |  |  | 1,032 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1,032 |
Shares issued in exchange for common units |  |  | — |  |  |  | — |  |  |  | 821 |  |  |  | — |  |  |  | — |  |  |  | (821 | ) |  |  | — |  |  |  | — |
Shares issued in exchange for redeemable stock |  |  | — |  |  |  | — |  |  |  | 575 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 575 |
Redeemable stock fair market value adjustment |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (835 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (835 | )
Adjustment for noncontrolling interests in Operating Partnership |  |  | — |  |  |  | — |  |  |  | (127 | ) |  |  | — |  |  |  | — |  |  |  | 127 |  |  |  | — |  |  |  | — |
Amortization of unearned compensation |  |  | — |  |  |  | — |  |  |  | 3,452 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 3,452 |
Dividends on preferred stock |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (922 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (922 | )
Dividends on common stock ($0.96 per share) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (109,557 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (109,557 | )
Dividends on noncontrolling interests units ($0.96 per unit) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (3,925 | ) |  |  | — |  |  |  | (3,925 | )
Contribution from noncontrolling interest |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 490 |  |  |  | 490 |
EQUITY BALANCE JUNE 30, 2019 |  | $ | 9 |  |  | $ | 1,138 |  |  | $ | 7,146,076 |  |  | $ | (1,086,665 | ) |  | $ | (9,092 | ) |  | $ | 215,404 |  |  | $ | 5,656 |  |  | $ | 6,272,526 |
Changes in MAA’s total equity and its components for the six months ended June 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 |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 111,710 |  |  |  | — |  |  |  | 3,970 |  |  |  | — |  |  |  | 115,680 |
Other comprehensive income - derivative instruments |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 513 |  |  |  | 18 |  |  |  | — |  |  |  | 531 |
Issuance and registration of common shares |  |  | — |  |  |  | — |  |  |  | (377 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (377 | )
Shares repurchased and retired |  |  | — |  |  |  | — |  |  |  | (5,657 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (5,657 | )
Exercise of stock options |  |  | — |  |  |  | — |  |  |  | 71 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 71 |
Shares issued in exchange for common units |  |  | — |  |  |  | — |  |  |  | 450 |  |  |  | — |  |  |  | — |  |  |  | (450 | ) |  |  | — |  |  |  | — |
Redeemable stock fair market value adjustment |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1,814 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1,814 |
Adjustment for noncontrolling interests in Operating Partnership |  |  | — |  |  |  | — |  |  |  | 173 |  |  |  | — |  |  |  | — |  |  |  | (173 | ) |  |  | — |  |  |  | — |
Amortization of unearned compensation |  |  | — |  |  |  | — |  |  |  | 8,153 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 8,153 |
Dividends on preferred stock |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (1,844 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (1,844 | )
Dividends on common stock ($2.00 per share) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (228,737 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (228,737 | )
Dividends on noncontrolling interests units ($2.00 per unit) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (8,118 | ) |  |  | — |  |  |  | (8,118 | )
Contribution from noncontrolling interest |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 602 |  |  |  | 602 |
EQUITY BALANCE JUNE 30, 2020 |  | $ | 9 |  |  | $ | 1,140 |  |  | $ | 7,168,886 |  |  | $ | (1,202,536 | ) |  | $ | (12,665 | ) |  | $ | 209,894 |  |  | $ | 6,849 |  |  | $ | 6,171,577 |
|  | 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 |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 125,577 |  |  |  | — |  |  |  | 4,522 |  |  |  | — |  |  |  | 130,099 |
Other comprehensive loss - derivative instruments |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (8,880 | ) |  |  | (325 | ) |  |  | — |  |  |  | (9,205 | )
Issuance and registration of common shares |  |  | — |  |  |  | 2 |  |  |  | 608 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 610 |
Shares repurchased and retired |  |  | — |  |  |  | — |  |  |  | (3,724 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (3,724 | )
Exercise of stock options |  |  | — |  |  |  | — |  |  |  | 1,240 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1,240 |
Shares issued in exchange for common units |  |  | — |  |  |  | — |  |  |  | 1,157 |  |  |  | — |  |  |  | — |  |  |  | (1,157 | ) |  |  | — |  |  |  | — |
Shares issued in exchange for redeemable stock |  |  | — |  |  |  | — |  |  |  | 575 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 575 |
Redeemable stock fair market value adjustment |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (2,186 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (2,186 | )
Adjustment for noncontrolling interests in Operating Partnership |  |  | — |  |  |  | — |  |  |  | (187 | ) |  |  | — |  |  |  | — |  |  |  | 187 |  |  |  | — |  |  |  | — |
Amortization of unearned compensation |  |  | — |  |  |  | — |  |  |  | 8,237 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 8,237 |
Dividends on preferred stock |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (1,844 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (1,844 | )
Dividends on common stock ($1.92 per share) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (218,949 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (218,949 | )
Dividends on noncontrolling interests units ($1.92 per unit) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (7,866 | ) |  |  | — |  |  |  | (7,866 | )
Contribution from noncontrolling interest |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 3,350 |  |  |  | 3,350 |
EQUITY BALANCE JUNE 30, 2019 |  | $ | 9 |  |  | $ | 1,138 |  |  | $ | 7,146,076 |  |  | $ | (1,086,665 | ) |  | $ | (9,092 | ) |  | $ | 215,404 |  |  | $ | 5,656 |  |  | $ | 6,272,526 |

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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