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Summary of Significant Accounting Policies - Investments (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2016
Jun. 05, 2015
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Investment in available for sale securities                
Impairment of assets           $ 5,082 $ 18,674 $ 194
The RMR Group Inc                
Investment in available for sale securities                
Investment in common shares     2,637,408     2,637,408    
Amount of investment acquired $ 69,826   $ 69,826   $ 69,826 $ 69,826 69,826  
Fair value of investment 104,178   156,398   104,178 156,398 104,178  
Unrealized gain $ 34,352   $ 86,572   $ 34,352 $ 86,572 $ 34,352  
The RMR Group Inc | Class A common shares                
Investment in available for sale securities                
Investment in common shares 2,637,408   2,637,408   2,637,408 2,637,408 2,637,408  
Five Star                
Investment in available for sale securities                
Investment in common shares 4,235,000   4,235,000   4,235,000 4,235,000 4,235,000  
Amount of investment acquired     $ 6,353     $ 6,353    
Impairment of assets         $ 2,795      
Weighted average quoted market prices (in dollars per share) $ 2.70   $ 1.50 $ 1.50        
RMR Inc. | Up C Transaction                
Investment in available for sale securities                
Amount of investment acquired   $ 60,700            
Fair value of investment   $ 136,278            
Investment, difference between carrying value and fair value           3,772 $ 3,772 $ 2,145
Unamortized liability for excess of fair value to carrying value     $ 68,161     $ 68,161    
Class A common shares | RMR Inc. | Up C Transaction                
Investment in available for sale securities                
Number of shares acquired (in shares)   5,272,787