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Selected Quarterly Financial Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Condensed Financial Statements Captions [Line Items]                      
Rental and other property revenues                 $ 1,641,017 $ 1,571,346 $ 1,528,987
Net income                 366,618 231,022 340,536
Net income available for MAA common shareholders                 $ 353,811 $ 222,899 $ 328,379
Net income available for MAA common shareholders                 $ 3.07 $ 1.93 $ 2.86
Net income available for MAA common shareholders                 $ 3.07 $ 1.93 $ 2.86
Limited Partner [Member]                      
Condensed Financial Statements Captions [Line Items]                      
Rental and other property revenues $ 416,817 $ 415,632 $ 407,390 $ 401,178 $ 398,148 $ 397,108 $ 390,073 $ 386,017 $ 1,641,017 $ 1,571,346 $ 1,528,987
Net income $ 155,060 $ 81,459 $ 64,141 $ 65,958 $ 63,517 $ 54,704 $ 61,981 $ 50,820 $ 366,618 $ 231,022 $ 340,536
Net income available for MAA common shareholders $ 1.30 $ 0.68 $ 0.53 $ 0.55 $ 0.53 $ 0.46 $ 0.52 $ 0.42 $ 3.07 $ 1.93 $ 2.86
Net income available for MAA common shareholders $ 1.30 $ 0.68 $ 0.53 $ 0.55 $ 0.53 $ 0.46 $ 0.52 $ 0.42 $ 3.07 $ 1.93 $ 2.86
Net income available for MAALP common unitholders $ 154,002 $ 80,537 $ 63,219 $ 65,036 $ 62,595 $ 53,782 $ 61,059 $ 49,898 $ 366,482 $ 231,022 $ 340,536
Parent Company                      
Condensed Financial Statements Captions [Line Items]                      
Rental and other property revenues 416,817 415,632 407,390 401,178 398,148 397,108 390,073 386,017      
Net income 155,060 81,459 64,141 65,958 63,517 54,704 61,981 50,820      
Net income available for MAA common shareholders $ 148,667 $ 77,723 $ 60,995 $ 62,738 $ 60,360 $ 51,869 $ 58,885 $ 48,097      
Net income available for MAA common shareholders $ 1.30 $ 0.68 $ 0.53 $ 0.55 $ 0.53 $ 0.46 $ 0.52 $ 0.42      
Net income available for MAA common shareholders $ 1.30 $ 0.68 $ 0.53 $ 0.55 $ 0.53 $ 0.46 $ 0.52 $ 0.42