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MAA Equity (Tables) | 6 Months Ended
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Jun. 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 June 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 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 unit) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (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 |
|  | 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 | )
Shares issued in exchange for redeemable stock |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
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 ($1.0000 per share) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (114,435 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (114,435 | )
Dividends on noncontrolling interests units ($1.0000 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 |
Changes in MAA’s total equity and its components for the six months ended June 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 |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 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 ($2.05 per share) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (235,150 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (235,150 | )
Dividends on noncontrolling interests units ($2.05 per unit) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (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 |
|  | 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 |

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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