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MAALP Capital (Tables) | 6 Months Ended
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Jun. 30, 2019
M A A L P Capital [Abstract] |
Summary of Changes in Total Capital and its Components | Changes in total capital and its components for the three months ended June 30, 2019 and 2018 were as follows (dollars in thousands):
|  | Mid-America Apartments, L.P. Unitholders' Capital |  |  |  |  |  |  |  |  |
|  | Limited Partner |  |  | General Partner |  |  | Preferred Units |  |  | Accumulated Other Comprehensive Loss |  |  | Noncontrolling Interests- Consolidated Real Estate Entities |  |  | Total Partnership Capital |
CAPITAL BALANCE MARCH 31, 2019 |  | $ | 218,011 |  |  | $ | 6,038,625 |  |  | $ | 66,840 |  |  | $ | (3,362 | ) |  | $ | 5,166 |  |  | $ | 6,325,280 |
Net income |  |  | 2,224 |  |  |  | 60,995 |  |  |  | 922 |  |  |  | — |  |  |  | — |  |  |  | 64,141 |
Other comprehensive loss - derivative instruments |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (6,004 | ) |  |  | — |  |  |  | (6,004 | )
Issuance of units |  |  | — |  |  |  | (519 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (519 | )
Units repurchased and retired |  |  | — |  |  |  | (701 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (701 | )
Exercise of unit options |  |  | — |  |  |  | 1,032 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1,032 |
General partnership units issued in exchange for limited partnership units |  |  | (821 | ) |  |  | 821 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Units issued in exchange for redeemable units |  |  | — |  |  |  | 575 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 575 |
Redeemable units fair market value adjustment |  |  | — |  |  |  | (835 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (835 | )
Adjustment for limited partners' capital at redemption value |  |  | (85 | ) |  |  | 85 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Amortization of unearned compensation |  |  | — |  |  |  | 3,452 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 3,452 |
Distributions to preferred unitholders |  |  | — |  |  |  | — |  |  |  | (922 | ) |  |  | — |  |  |  | — |  |  |  | (922 | )
Distributions to common unitholders ($0.9600 per unit) |  |  | (3,925 | ) |  |  | (109,557 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (113,482 | )
Contribution from noncontrolling interest |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 490 |  |  |  | 490 |
CAPITAL BALANCE JUNE 30, 2019 |  | $ | 215,404 |  |  | $ | 5,993,973 |  |  | $ | 66,840 |  |  | $ | (9,366 | ) |  | $ | 5,656 |  |  | $ | 6,272,507 |
|  | Mid-America Apartments, L.P. Unitholders' Capital |  |  |  |  |  |  |  |  |
|  | Limited Partner |  |  | General Partner |  |  | Preferred Units |  |  | Accumulated Other Comprehensive Income |  |  | Noncontrolling Interests - Consolidated Real Estate Entities |  |  | Total Partnership Capital |
CAPITAL BALANCE MARCH 31, 2018 |  | $ | 226,815 |  |  | $ | 6,221,216 |  |  | $ | 66,840 |  |  | $ | 3,167 |  |  | $ | 2,306 |  |  | $ | 6,520,344 |
Net income |  |  | 2,174 |  |  |  | 58,885 |  |  |  | 922 |  |  |  | — |  |  |  | — |  |  |  | 61,981 |
Other comprehensive income - derivative instruments |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 5,165 |  |  |  | — |  |  |  | 5,165 |
Issuance of units |  |  | — |  |  |  | (341 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (341 | )
General partnership units issued in exchange for limited partnership units |  |  | (338 | ) |  |  | 338 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Redeemable units fair market value adjustment |  |  | — |  |  |  | (892 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (892 | )
Adjustment for limited partners' capital at redemption value |  |  | (24 | ) |  |  | 24 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Amortization of unearned compensation |  |  | — |  |  |  | 2,963 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 2,963 |
Distributions to preferred unitholders |  |  | — |  |  |  | — |  |  |  | (922 | ) |  |  | — |  |  |  | — |  |  |  | (922 | )
Distributions to common unitholders ($0.9225 per unit) |  |  | (3,814 | ) |  |  | (105,023 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (108,837 | )
CAPITAL BALANCE JUNE 30, 2018 |  | $ | 224,813 |  |  | $ | 6,177,170 |  |  | $ | 66,840 |  |  | $ | 8,332 |  |  | $ | 2,306 |  |  | $ | 6,479,461 |
Changes in total capital and its components for the six months ended June 30, 2019 and 2018 were as follows (dollars in thousands):
|  | Mid-America Apartments, L.P. Unitholders' Capital |  |  |  |  |  |  |  |  |
|  | Limited Partner |  |  | General Partner |  |  | Preferred Units |  |  | Accumulated Other Comprehensive Loss |  |  | Noncontrolling Interests- Consolidated Real Estate Entities |  |  | Total Partnership Capital |
CAPITAL BALANCE DECEMBER 31, 2018 |  | $ | 220,043 |  |  | $ | 6,083,142 |  |  | $ | 66,840 |  |  | $ | (161 | ) |  | $ | 2,306 |  |  | $ | 6,372,170 |
Net income |  |  | 4,522 |  |  |  | 123,733 |  |  |  | 1,844 |  |  |  | — |  |  |  | — |  |  |  | 130,099 |
Other comprehensive loss - derivative instruments |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (9,205 | ) |  |  | — |  |  |  | (9,205 | )
Issuance of units |  |  | — |  |  |  | 610 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 610 |
Units repurchased and retired |  |  | — |  |  |  | (3,724 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (3,724 | )
Exercise of unit options |  |  | — |  |  |  | 1,240 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1,240 |
General partnership units issued in exchange for limited partnership units |  |  | (1,157 | ) |  |  | 1,157 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Units issued in exchange for redeemable units |  |  | — |  |  |  | 575 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 575 |
Redeemable units fair market value adjustment |  |  | — |  |  |  | (2,186 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (2,186 | )
Adjustment for limited partners' capital at redemption value |  |  | (138 | ) |  |  | 138 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Amortization of unearned compensation |  |  | — |  |  |  | 8,237 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 8,237 |
Distributions to preferred unitholders |  |  | — |  |  |  | — |  |  |  | (1,844 | ) |  |  | — |  |  |  | — |  |  |  | (1,844 | )
Distributions to common unitholders ($1.9200 per unit) |  |  | (7,866 | ) |  |  | (218,949 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (226,815 | )
Contribution from noncontrolling interest |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 3,350 |  |  |  | 3,350 |
CAPITAL BALANCE JUNE 30, 2019 |  | $ | 215,404 |  |  | $ | 5,993,973 |  |  | $ | 66,840 |  |  | $ | (9,366 | ) |  | $ | 5,656 |  |  | $ | 6,272,507 |
|  | Mid-America Apartments, L.P. Unitholders' Capital |  |  |  |  |  |  |  |  |
|  | Limited Partner |  |  | General Partner |  |  | Preferred Units |  |  | Accumulated Other Comprehensive Income |  |  | Noncontrolling Interests - Consolidated Real Estate Entities |  |  | Total Partnership Capital |
CAPITAL BALANCE DECEMBER 31, 2017 |  | $ | 231,676 |  |  | $ | 6,270,758 |  |  | $ | 66,840 |  |  | $ | 2,295 |  |  | $ | 2,306 |  |  | $ | 6,573,875 |
Net income |  |  | 3,975 |  |  |  | 106,982 |  |  |  | 1,844 |  |  |  | — |  |  |  | — |  |  |  | 112,801 |
Other comprehensive income - derivative instruments |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 5,804 |  |  |  | — |  |  |  | 5,804 |
Issuance of units |  |  | — |  |  |  | (236 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (236 | )
Units repurchased and retired |  |  | — |  |  |  | (2,912 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (2,912 | )
Exercise of unit options |  |  | — |  |  |  | 625 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 625 |
General partnership units issued in exchange for limited partnership units |  |  | (3,118 | ) |  |  | 3,118 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Units issued in exchange for redeemable units |  |  | — |  |  |  | 1,915 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1,915 |
Redeemable units fair market value adjustment |  |  | — |  |  |  | 73 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 73 |
Adjustment for limited partners' capital at redemption value |  |  | (87 | ) |  |  | 87 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Cumulative adjustment due to adoption of ASU 2017-12 |  |  | — |  |  |  | (233 | ) |  |  | — |  |  |  | 233 |  |  |  | — |  |  |  | — |
Amortization of unearned compensation |  |  | — |  |  |  | 6,987 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 6,987 |
Distributions to preferred unitholders |  |  | — |  |  |  | — |  |  |  | (1,844 | ) |  |  | — |  |  |  | — |  |  |  | (1,844 | )
Distributions to common unitholders ($1.8450 per unit) |  |  | (7,633 | ) |  |  | (209,994 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (217,627 | )
CAPITAL BALANCE JUNE 30, 2018 |  | $ | 224,813 |  |  | $ | 6,177,170 |  |  | $ | 66,840 |  |  | $ | 8,332 |  |  | $ | 2,306 |  |  | $ | 6,479,461 |

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- Definition MAALP Capital [Abstract] + References No definition available. + Details
Name: | maa_MAALPCapitalAbstract
Namespace Prefix: | maa_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Partners' Capital [Table Text Block] + References No definition available. + Details
Name: | maa_PartnersCapitalTableTextBlock
Namespace Prefix: | maa_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration