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MAA Equity (Tables) | 6 Months Ended
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Jun. 30, 2019
M A A Equity [Abstract] |
Summary of Changes in Total Equity and its Components | Changes in total equity and its components for the three months ended June 30, 2019 and 2018 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, 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 ($0.9600 per share) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (109,557 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (109,557 | )
Dividends on noncontrolling interests units ($0.9600 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 |
|  | 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 Income |  |  | Noncontrolling Interests - Operating Partnership |  |  | Noncontrolling Interests - Consolidated Real Estate Entities |  |  | Total Equity |
EQUITY BALANCE MARCH 31, 2018 |  | $ | 9 |  |  | $ | 1,135 |  |  | $ | 7,127,740 |  |  | $ | (840,642 | ) |  | $ | 3,000 |  |  | $ | 226,815 |  |  | $ | 2,306 |  |  | $ | 6,520,363 |
Net income |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 59,807 |  |  |  | — |  |  |  | 2,174 |  |  |  | — |  |  |  | 61,981 |
Other comprehensive income - derivative instruments |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 4,986 |  |  |  | 179 |  |  |  | — |  |  |  | 5,165 |
Issuance and registration of common shares |  |  | — |  |  |  | — |  |  |  | (341 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (341 | )
Shares issued in exchange for common units |  |  | — |  |  |  | 1 |  |  |  | 337 |  |  |  | — |  |  |  | — |  |  |  | (338 | ) |  |  | — |  |  |  | — |
Redeemable stock fair market value adjustment |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (892 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (892 | )
Adjustment for noncontrolling interests in Operating Partnership |  |  | — |  |  |  | — |  |  |  | 203 |  |  |  | — |  |  |  | — |  |  |  | (203 | ) |  |  | — |  |  |  | — |
Amortization of unearned compensation |  |  | — |  |  |  | — |  |  |  | 2,963 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 2,963 |
Dividends on preferred stock |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (922 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (922 | )
Dividends on common stock ($0.9225 per share) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (105,023 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (105,023 | )
Dividends on noncontrolling interests units ($0.9225 per unit) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (3,814 | ) |  |  | — |  |  |  | (3,814 | )
EQUITY BALANCE JUNE 30, 2018 |  | $ | 9 |  |  | $ | 1,136 |  |  | $ | 7,130,902 |  |  | $ | (887,672 | ) |  | $ | 7,986 |  |  | $ | 224,813 |  |  | $ | 2,306 |  |  | $ | 6,479,480 |
Changes in total equity and its components for the six months ended June 30, 2019 and 2018 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, 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 ($1.9200 per share) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (218,949 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (218,949 | )
Dividends on noncontrolling interests units ($1.9200 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 |
|  | 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 Income |  |  | Noncontrolling Interests - Operating Partnership |  |  | Noncontrolling Interests - Consolidated Real Estate Entities |  |  | Total Equity |
EQUITY BALANCE DECEMBER 31, 2017 |  | $ | 9 |  |  | $ | 1,134 |  |  | $ | 7,121,112 |  |  | $ | (784,500 | ) |  | $ | 2,157 |  |  | $ | 231,676 |  |  | $ | 2,306 |  |  | $ | 6,573,894 |
Net income |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 108,826 |  |  |  | — |  |  |  | 3,975 |  |  |  | — |  |  |  | 112,801 |
Other comprehensive income - derivative instruments |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 5,596 |  |  |  | 208 |  |  |  | — |  |  |  | 5,804 |
Issuance and registration of common shares |  |  | — |  |  |  | 1 |  |  |  | (237 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (236 | )
Shares repurchased and retired |  |  | — |  |  |  | — |  |  |  | (2,912 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (2,912 | )
Exercise of stock options |  |  | — |  |  |  | — |  |  |  | 625 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  |  |  |  |  | 625 |
Shares issued in exchange for common units |  |  | — |  |  |  | 1 |  |  |  | 3,117 |  |  |  | — |  |  |  | — |  |  |  | (3,118 | ) |  |  | — |  |  |  | — |
Shares issued in exchange for redeemable stock |  |  | — |  |  |  | — |  |  |  | 1,915 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1,915 |
Redeemable stock fair market value adjustment |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 73 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 73 |
Adjustment for noncontrolling interests in Operating Partnership |  |  | — |  |  |  | — |  |  |  | 295 |  |  |  | — |  |  |  | — |  |  |  | (295 | ) |  |  | — |  |  |  | — |
Cumulative adjustment due to adoption of ASU 2017-12 |  |  |  |  |  |  | — |  |  |  | — |  |  |  | (233 | ) |  |  | 233 |  |  |  | — |  |  |  | — |  |  |  | — |
Amortization of unearned compensation |  |  | — |  |  |  | — |  |  |  | 6,987 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 6,987 |
Dividends on preferred stock |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (1,844 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (1,844 | )
Dividends on common stock ($1.8450 per share) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (209,994 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (209,994 | )
Dividends on noncontrolling interests units ($1.8450 per unit) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (7,633 | ) |  |  | — |  |  |  | (7,633 | )
EQUITY BALANCE JUNE 30, 2018 |  | $ | 9 |  |  | $ | 1,136 |  |  | $ | 7,130,902 |  |  | $ | (887,672 | ) |  | $ | 7,986 |  |  | $ | 224,813 |  |  | $ | 2,306 |  |  | $ | 6,479,480 |

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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