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Shareholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Aug. 26, 2016
Aug. 19, 2016
May 25, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Common Share Issuances            
Net proceeds from sale of common shares $ 371,956     $ 371,956 $ 0 $ 0
Common shares granted under equity compensation plan (in shares)       91,600 91,250 92,225
RMR LLC            
Common Share Issuances            
Share grants (in shares)       79,100 76,250 79,725
Aggregate value of awards granted during the period       $ 2,260 $ 1,957 $ 2,272
RMR LLC | Officers and employees of RMR            
Common Share Issuances            
Aggregate value of awards granted during the period       $ 2,260 $ 1,957 $ 2,272
Public offering            
Common Share Issuances            
Common stock, shares issued (in shares)   11,000,000        
Price per share (in dollars per share)   $ 30.75        
Over-allotment option            
Common Share Issuances            
Common stock, shares issued (in shares) 1,650,000          
Price per share (in dollars per share) $ 30.75          
Common shares            
Common Share Issuances            
Common stock, shares issued (in shares)       12,650,000 1,553,119 222,200
Share grants (in shares)       91,600 90,060 92,225
Common shares | Trustees            
Common Share Issuances            
Aggregate value of awards granted during the period       $ 319 $ 445 $ 366
Common shares granted under equity compensation plan (in shares)     2,500      
Market value of common stock issued per trustee       $ 64 $ 74 $ 73
2012 Equity Compensation Plan            
Common Share Issuances            
Remaining shares of common shares reserved to be issued under share award plans (in shares)       2,585,527