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MAA Equity - Summary of Changes in Total Equity and its Components (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance $ 6,325,299 $ 6,520,363 $ 6,372,189 $ 6,573,894
Net Income Including Portion Attributable to Noncontrolling Interest 64,141 61,981 130,099 112,801
Other comprehensive (loss) income - derivatives instruments (cash flow hedges) (6,004) 5,165 (9,205) 5,804
Issuance and registration of common shares (519) (341) 610 (236)
Shares repurchased and retired (701)   (3,724) (2,912)
Exercise of stock options 1,032   1,240 625
Shares issued in exchange for redeemable stock 575   575 1,915
Redeemable stock fair market value (835) (892) (2,186) 73
Adjustment for noncontrolling interests in Operating Partnership 490   3,350  
Amortization of unearned compensation 3,452 2,963 8,237 6,987
Dividends, Preferred Stock, Cash (922) (922) (1,844) (1,844)
Dividends on common stock (109,557) (105,023) (218,949) (209,994)
Dividends on noncontrolling interest units (3,925) (3,814) (7,866) (7,633)
Contribution from noncontrolling interest 490   3,350  
Ending Balance 6,272,526 6,479,480 6,272,526 6,479,480
Preferred Stock [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance 9 9 9 9
Ending Balance 9 9 9 9
Common Stock [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance 1,137 1,135 1,136 1,134
Issuance and registration of common shares 1   2 1
Shares issued in exchange for units   1   1
Ending Balance 1,138 1,136 1,138 1,136
Additional Paid-in Capital [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance 7,141,544 7,127,740 7,138,170 7,121,112
Issuance and registration of common shares (520) (341) 608 (237)
Shares repurchased and retired (701)   (3,724) (2,912)
Exercise of stock options 1,032   1,240 625
Shares issued in exchange for units 821 337 1,157 3,117
Shares issued in exchange for redeemable stock 575   575 1,915
Adjustment for noncontrolling interests in Operating Partnership (127) 203 (187) 295
Amortization of unearned compensation 3,452 2,963 8,237 6,987
Ending Balance 7,146,076 7,130,902 7,146,076 7,130,902
Accumulated Distributions in Excess of Net Income [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance (1,037,268) (840,642) (989,263) (784,500)
Net income attributable to MAA 61,917 59,807 125,577 108,826
Redeemable stock fair market value (835) (892) (2,186) 73
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification       (233)
Dividends, Preferred Stock, Cash (922) (922) (1,844) (1,844)
Dividends on common stock (109,557) (105,023) (218,949) (209,994)
Ending Balance (1,086,665) (887,672) (1,086,665) (887,672)
Accumulated Other Comprehensive Income (Loss) [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance (3,300) 3,000 (212) 2,157
Other comprehensive (loss) income - derivatives instruments (cash flow hedges) (5,792) 4,986 (8,880) 5,596
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification       233
Ending Balance (9,092) 7,986 (9,092) 7,986
Noncontrolling Interest        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance 5,166 2,306 2,306 2,306
Adjustment for noncontrolling interests in Operating Partnership 490   3,350  
Contribution from noncontrolling interest 490   3,350  
Ending Balance 5,656 2,306 5,656 2,306
General Partner        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance 218,011 226,815 220,043 231,676
Net Income Attributable to Noncontrolling Interest 2,224 2,174 4,522 3,975
Other comprehensive (loss) income - derivatives instruments (cash flow hedges) (212) 179 (325) 208
Shares issued in exchange for units (821) (338) (1,157) (3,118)
Adjustment for noncontrolling interests in Operating Partnership 127 (203) 187 (295)
Dividends on noncontrolling interest units (3,925) (3,814) (7,866) (7,633)
Ending Balance $ 215,404 $ 224,813 $ 215,404 $ 224,813