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MAA Equity - Summary of Changes in Total Equity and its Components (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Dividends, Preferred Stock, Cash $ (922) $ (922) $ (2,766) $ (2,766)
Mid America Apartment Communities Inc Shareholders Equity        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance 6,171,577 6,272,526 6,289,459 6,372,189
Net Income Including Portion Attributable to Noncontrolling Interest 62,036 81,459 177,716 211,558
Other comprehensive income (loss) - derivatives instruments (cash flow hedges) 279 (5,973) 810 (15,178)
Issuance and registration of common shares 33 140 (344) 750
Shares repurchased and retired     (5,657) (3,724)
Exercise of stock options   (204) 71 1,036
Shares issued in exchange for redeemable stock       575
Redeemable stock fair market value adjustment (155) (1,269) 1,659 (3,455)
Amortization of unearned compensation 4,380 3,313 12,533 11,550
Dividends, Preferred Stock, Cash (922) (922) (2,766) (2,766)
Dividends on common stock (114,369) (109,503) (343,106) (328,452)
Dividends on noncontrolling interest units (3,866) (3,912) (11,984) (11,778)
Contribution from noncontrolling interest 262 955 864 4,305
Ending Balance 6,119,255 6,236,610 6,119,255 6,236,610
Preferred Stock [Member] | Mid America Apartment Communities Inc Shareholders Equity        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance 9 9 9 9
Ending Balance 9 9 9 9
Common Stock [Member] | Mid America Apartment Communities Inc Shareholders Equity        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance 1,140 1,138 1,140 1,136
Issuance and registration of common shares       2
Ending Balance 1,140 1,138 1,140 1,138
Additional Paid-in Capital [Member] | Mid America Apartment Communities Inc Shareholders Equity        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance 7,168,886 7,146,076 7,166,073 7,138,170
Issuance and registration of common shares 33 140 (344) 748
Shares repurchased and retired     (5,657) (3,724)
Exercise of stock options   (204) 71 1,036
Shares issued in exchange for common units 21 836 471 1,993
Shares issued in exchange for redeemable stock       575
Adjustment for noncontrolling interests in Operating Partnership 71 (272) 244 (459)
Amortization of unearned compensation 4,380 3,313 12,533 11,550
Ending Balance 7,173,391 7,149,889 7,173,391 7,149,889
Accumulated Distributions in Excess of Net Income [Member] | Mid America Apartment Communities Inc Shareholders Equity        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance (1,202,536) (1,086,665) (1,085,479) (989,263)
Net income attributable to MAA 59,910 78,645 171,620 204,222
Redeemable stock fair market value adjustment (155) (1,269) 1,659 (3,455)
Dividends, Preferred Stock, Cash (922) (922) (2,766) (2,766)
Dividends on common stock (114,369) (109,503) (343,106) (328,452)
Ending Balance (1,258,072) (1,119,714) (1,258,072) (1,119,714)
Accumulated Other Comprehensive Income (Loss) [Member] | Mid America Apartment Communities Inc Shareholders Equity        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance (12,665) (9,092) (13,178) (212)
Other comprehensive income (loss) - derivatives instruments (cash flow hedges) 269 (5,778) 782 (14,658)
Ending Balance (12,396) (14,870) (12,396) (14,870)
Noncontrolling Interest Operating Partnership | Mid America Apartment Communities Inc Shareholders Equity        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance 209,894 215,404 214,647 220,043
Net Income Attributable to Noncontrolling Interest 2,126 2,814 6,096 7,336
Other comprehensive income (loss) - derivatives instruments (cash flow hedges) 10 (195) 28 (520)
Shares issued in exchange for common units (21) (836) (471) (1,993)
Adjustment for noncontrolling interests in Operating Partnership (71) 272 (244) 459
Dividends on noncontrolling interest units (3,866) (3,912) (11,984) (11,778)
Ending Balance 208,072 213,547 208,072 213,547
Noncontrolling Interest | Mid America Apartment Communities Inc Shareholders Equity        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance 6,849 5,656 6,247 2,306
Contribution from noncontrolling interest 262 955 864 4,305
Ending Balance $ 7,111 $ 6,611 $ 7,111 $ 6,611