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Related Person Transactions (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Nov. 10, 2016
$ / shares
shares
Nov. 30, 2017
community
property
Mar. 31, 2017
building
Dec. 31, 2018
USD ($)
community
building
property
lease_agreement
party
agreement
shares
Dec. 31, 2017
USD ($)
community
property
Dec. 31, 2016
USD ($)
community
property
Oct. 02, 2016
shares
Dec. 31, 2001
Related Party Transaction [Line Items]                
Number of buildings included in joint venture agreement | building     2          
Equity in earnings of an investee       $ 516 $ 608 $ 137    
Equity in unrealized (loss) gain of an investee       $ (68) 462 152    
The RMR Group Inc                
Related Party Transaction [Line Items]                
Number of unrelated parties | party       4        
Related party transaction, rate       3.00%        
RMR Inc. | Common Shares                
Related Party Transaction [Line Items]                
Investment in common shares (in shares) | shares       2,345,000        
Period of shares not transferred       10 years        
RMR Inc. | Class A common shares                
Related Party Transaction [Line Items]                
Investment in common shares (in shares) | shares       2,637,408        
RMR LLC                
Related Party Transaction [Line Items]                
Rental revenue from related party       $ 228 $ 331 $ 242    
Senior Living Communities | Acquisitions                
Related Party Transaction [Line Items]                
Number of properties acquired or agreed to be acquired | property       4   10    
MOBs                
Related Party Transaction [Line Items]                
Number of properties acquired or agreed to be acquired | property       13   2    
Standalone insurance policy coverage period       1 year        
Number of buildings included in joint venture agreement | building       2        
MOBs | Acquisitions                
Related Party Transaction [Line Items]                
Number of properties acquired or agreed to be acquired | property       4 6 3    
Purchase price excluding closing costs           $ 86,432    
Five Star                
Related Party Transaction [Line Items]                
Percentage of total shares outstanding       8.30%       100.00%
Investment in common shares (in shares) | shares       4,235,000        
Maximum percentage of any class of equity shares that can be acquired without approval       9.80%        
Number of real estate properties leased | community       184 185 185    
Property subject to or available for operating lease, number of leases | lease_agreement       5        
Related party transactions, shares authorized to purchase (in shares) | shares             18,000,000  
Related party transaction, percent of shares issued and outstanding             38.00%  
Related party transaction, shares purchased (in shares) | shares 17,999,999              
Share price (in dollars per share) | $ / shares $ 3.00              
Five Star | RMR LLC                
Related Party Transaction [Line Items]                
Percentage of total shares outstanding       35.40%        
Five Star | Senior Living Communities                
Related Party Transaction [Line Items]                
Number of communities managed | community       76 70 68    
Five Star | Senior Living Communities | Acquisitions                
Related Party Transaction [Line Items]                
Number of communities managed | community   5            
Number of properties acquired or agreed to be acquired | property   6            
RMR LLC                
Related Party Transaction [Line Items]                
Number of management agreements with related party | agreement       2        
Premium payable for combined directors' and officers' liability insurance policy       $ 253 $ 255 $ 142    
AIC                
Related Party Transaction [Line Items]                
Total premiums including taxes and fees       4,413 2,433 3,607    
Equity method investments, carrying value       $ 8,632 $ 8,185 $ 7,116    
Year one | RMR LLC | RMR Inc.                
Related Party Transaction [Line Items]                
Award vesting rights, percentage       20.00%        
Year two | RMR LLC | RMR Inc.                
Related Party Transaction [Line Items]                
Award vesting rights, percentage       20.00%        
Year three | RMR LLC | RMR Inc.                
Related Party Transaction [Line Items]                
Award vesting rights, percentage       20.00%        
Year four | RMR LLC | RMR Inc.                
Related Party Transaction [Line Items]                
Award vesting rights, percentage       20.00%        
Year five | RMR LLC | RMR Inc.                
Related Party Transaction [Line Items]                
Award vesting rights, percentage       20.00%        
Five Star                
Related Party Transaction [Line Items]                
Minimum percentage of ownership of lessee's voting stock above which the entity has the option to cancel all its rights       9.80%