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Business and Property Management Agreements with RMR LLC (Details)
$ in Thousands
 5 Months Ended 12 Months Ended
Jun. 05, 2015
Jun. 05, 2015
shares
Dec. 31, 2017
USD ($)
employee
day
Dec. 31, 2017
USD ($)
employee
day
Dec. 31, 2017
USD ($)
employee
day
Dec. 31, 2017
USD ($)
lease_agreement
employee
day
Dec. 31, 2017
USD ($)
employee
day
management_agreement
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Related Party Transaction [Line Items]                  
Number of employees | employee     0 0 0 0 0    
Recognized amortization of the liability       $ 798       $ 798 $ 402
Property management and construction supervision fees       10,919       10,585 10,342
Property management and construction supervision fees paid       9,993       9,061 7,021
Professional Fees       275       235 256
RMR LLC                  
Related Party Transaction [Line Items]                  
Business management fees incurred       38,638       36,763 34,949
Recognized amortization of the liability       2,974       2,974 1,743
Common shares issued for the incentive fees | shares   68,983,000              
Related Party Transaction Business Management Agreement Incentive Fee Payable     $ 55,740 $ 55,740 $ 55,740 $ 55,740 $ 55,740 $ 0 $ 0
Period over which transition services will be provided by the related party after termination of the agreement     120 days            
MOBs | RMR LLC                  
Related Party Transaction [Line Items]                  
Base business management fee payable in cash (as a percent)     3.00% 3.00% 3.00% 3.00% 3.00%    
Construction supervision fees payable under property management agreement as a percentage of construction costs     5.00% 5.00% 5.00% 5.00% 5.00%    
Senior Living Communities | Five Star                  
Related Party Transaction [Line Items]                  
Number of consecutive renewal terms of agreement           2 2    
Amended Agreement                  
Related Party Transaction [Line Items]                  
Base management fee payable as a percentage of aggregate book value of real estate assets or transferred assets     0.50% 0.50% 0.50% 0.50% 0.50%    
Amended Agreement | RMR LLC                  
Related Party Transaction [Line Items]                  
Base management fee payable as a percentage of average historical cost of real estate investments, excluding transferred assets for investments exceeding specified amount     0.50% 0.50% 0.50% 0.50% 0.50%    
Base management fee payable as a percentage of average historical cost of real estate investments, excluding transferred assets for investments up to specified amount     0.70% 0.70% 0.70% 0.70% 0.70%    
Threshold amount of other real estate investments for payment of base management fee     $ 250,000 $ 250,000 $ 250,000 $ 250,000 $ 250,000    
Base management fee payable as a percentage of average market capitalization exceeding specified amount     0.50% 0.50% 0.50% 0.50% 0.50%    
Threshold amount of average market capitalization for payment of base management fee     $ 250,000 $ 250,000 $ 250,000 $ 250,000 $ 250,000    
Base management fee payable as a percentage of average closing price per share of common shares on NYSE     0.70% 0.70% 0.70% 0.70% 0.70%    
Incentive management fee payable (as a percent)     12.00% 12.00% 12.00% 12.00% 12.00%    
Period of measurement     3 years            
Related Party Transaction, Incentive Management Fee Cap on Common Shares     1.50% 1.50% 1.50% 1.50% 1.50%    
Related Party Transaction, Incentive Management Fee, Top Consecutive Trading Days | day     10 10 10 10 10    
Related Party Transaction, Incentive Management Fee, Consecutive Trading Days | day     30 30 30 30 30    
Amended Agreement | RMR LLC | Up C Transaction                  
Related Party Transaction [Line Items]                  
Number of business days notice for termination of property management agreement for convenience by the related party 60 days                
Window for providing notice of termination of property management agreement for performance by the related party 60 days                
Window for providing notice of termination of property management agreement for change of control by the related party 12 months                
Number of terminated management agreements for convenience before termination fee is incurred | lease_agreement           1      
Number of RMR LLC terminated management agreements for good cause before termination fee is incurred | lease_agreement           1      
Number of terminated management agreements for a performance reason before termination fee is incurred | lease_agreement           1      
Termination fee remaining term assumption     10 years            
Maximum | RMR LLC                  
Related Party Transaction [Line Items]                  
Threshold amount of real estate investments for payment of base management fee     $ 250,000 $ 250,000 $ 250,000 $ 250,000 $ 250,000    
Base management fee payable, average market capitalization     $ 250,000 $ 250,000 $ 250,000 $ 250,000 $ 250,000    
Maximum | Amended Agreement | RMR LLC                  
Related Party Transaction [Line Items]                  
Related Party Transaction, Incentive Management Fee Reduction, Total Return Per Share, Basis Spread         5.00%        
Maximum | Amended Agreement | RMR LLC | Up C Transaction                  
Related Party Transaction [Line Items]                  
Termination fee term     20 years            
Minimum | Amended Agreement | RMR LLC                  
Related Party Transaction [Line Items]                  
Related Party Transaction, Incentive Management Fee Reduction, Total Return Per Share, Basis Spread         2.00%        
Minimum | Amended Agreement | RMR LLC | Up C Transaction                  
Related Party Transaction [Line Items]                  
Termination fee term     19 years