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Selected Quarterly Financial Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Condensed Financial Statements, Captions [Line Items]                      
Preferred Stock Dividends, Income Statement Impact                     $ 0
Parent Company [Member]                      
Condensed Financial Statements, Captions [Line Items]                      
Total operating revenues $ 382,738 $ 384,550 $ 382,791 $ 378,908 $ 307,198 $ 276,898 $ 272,236 $ 269,016 $ 1,528,987 $ 1,125,348 1,042,779
Income from continuing operations before non-operating items 96,473 94,671 85,976 77,656 44,618 74,823 78,215 77,422 354,776 275,078 290,908
Interest expense                 (154,751) (129,947) (122,344)
Loss from real estate joint ventures                 1,370 241 (2)
Consolidated net income 128,007 118,958 50,155 43,416 42,058 88,906 47,630 45,808 340,536 224,402 350,745
Net income attributable to noncontrolling interest                 12,157 12,180 18,458
Preferred Stock Dividends, Income Statement Impact                 3,688 307  
Net income (loss) available for MAA common shareholders $ 122,528 $ 113,787 $ 47,393 $ 40,983 $ 39,079 $ 84,279 $ 45,144 $ 43,413 $ 324,691 $ 211,915 $ 332,287
Earnings per share - basic $ 1.08 $ 1.00 $ 0.42 $ 0.36 $ 0.44 $ 1.12 $ 0.60 $ 0.58 $ 2.86 $ 2.69 $ 4.41
Earnings per share - diluted $ 1.08 $ 1.00 $ 0.42 $ 0.36 $ 0.44 $ 1.12 $ 0.60 $ 0.58 2.86 2.69 4.41
Common Stock, Dividends, Per Share, Cash Paid                 $ 3.48 $ 3.28 $ 3.08
Net Cash Provided by (Used in) Operating Activities                 $ 658,513 $ 484,039 $ 463,721
Proceeds from Stock Options Exercised                 432 0 420
Net Cash Provided by (Used in) Investing Activities                 (283,435) (710,487) (136,215)
Return (funding) of escrow for future acquisitions                 10,591 (58,259) 8
Payments To Acquire Real Estate And Other Assets                 (136,065) (339,186) (328,193)
Payments for Capital Improvements                 (343,890) (183,977) (166,021)
Net Cash Provided by (Used in) Financing Activities                 (397,864) 222,425 (316,600)
Limited Partner [Member]                      
Condensed Financial Statements, Captions [Line Items]                      
Total operating revenues $ 382,738 $ 384,550 $ 382,791 $ 378,908 $ 307,198 $ 276,898 $ 272,236 $ 269,016 1,528,987 1,125,348 1,042,779
Income from continuing operations before non-operating items 96,473 94,671 85,976 77,656 44,618 74,823 78,215 77,422 354,776 275,078 290,908
Interest expense                 (154,751) (129,947) (122,344)
Loss from real estate joint ventures                 1,370 241 (2)
Consolidated net income 128,007 118,958 50,155 43,416 42,058 88,906 47,630 45,808 340,536 224,402 350,745
Preferred Stock Dividends, Income Statement Impact                 (3,688) (307) 0
Net Income (Loss) Available to Common Unitholders $ 127,085 $ 118,036 $ 49,233 $ 42,494 $ 41,751 $ 88,906 $ 47,630 $ 45,808      
Earnings per share - basic $ 1.08 $ 1.00 $ 0.42 $ 0.36 $ 0.45 $ 1.12 $ 0.60 $ 0.61      
Earnings per share - diluted $ 1.08 $ 1.00 $ 0.42 $ 0.36 $ 0.45 $ 1.12 $ 0.60 $ 0.61      
Net Cash Provided by (Used in) Operating Activities                 658,513 484,039 463,721
Proceeds from Stock Options Exercised                 432 0 420
Net Cash Provided by (Used in) Investing Activities                 (283,435) (710,487) (136,215)
Return (funding) of escrow for future acquisitions                 10,591 (58,259) 8
Payments To Acquire Real Estate And Other Assets                 (136,065) (339,186) (328,193)
Payments for Capital Improvements                 (343,890) (183,977) (166,021)
Net Cash Provided by (Used in) Financing Activities                 $ (397,864) $ 222,425 $ (316,600)