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Shareholders' Equity of MAA - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Dec. 01, 2016
Preferred Stock, Liquidation Preference Per Share $ 50.00      
Preferred Stock, Redemption Date Oct. 01, 2026      
Preferred Stock, Redemption Price Per Share $ 50.00      
Common stock, shares outstanding 113,838,139 113,627,014    
Total common shares and operating partnership units outstanding 117,952,415 117,827,046    
Treasury Stock, Shares, Acquired 32,391 47,956    
Preferred Stock, Dividend Rate, Percentage 8.50%      
Preferred Stock, Dividend Rate, Per-Dollar-Amount $ 4.25      
Preferred Stock, Liquidation Preference, Value $ 43,400      
Equity Option [Member]        
Stock Issued During Period, Shares, New Issues 17,823 10,340    
Noncontrolling Interest [Member]        
Common Shares Issuable Upon Conversion Of Convertible Stock 4,114,276 4,200,032    
Parent Company [Member]        
Preferred Stock, Shares Outstanding 867,846   867,846  
Preferred Stock, Liquidation Preference Per Share $ 50   $ 50  
Common stock, shares outstanding 113,838,139   113,643,166  
Proceeds from Stock Options Exercised $ 916 $ 432    
Employee Stock Option [Member]        
Common stock shares, outstanding option 90,615 108,438    
Redeemable Preferred Stock [Member]        
Preferred Stock, Shares Outstanding       867,846