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Related Person Transactions (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
Feb. 16, 2024
USD ($)
Dec. 31, 2023
USD ($)
agreement
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Mar. 20, 2023
Feb. 28, 2023
$ / shares
Related Party Transaction            
Revenue   $ 1,410,308 $ 1,283,566 $ 1,383,212    
Rental income            
Related Party Transaction            
Revenue   $ 258,400 260,740 408,589    
RMR LLC            
Related Party Transaction            
Number of management agreements with related party | agreement   2        
RMR LLC | Rental income            
Related Party Transaction            
Revenue   $ 196 303 $ 190    
AlerisLife Inc            
Related Party Transaction            
Investment in equity securities acquisition, share price (in dollars per share) | $ / shares           $ 1.31
AlerisLife Inc | Subsequent Event            
Related Party Transaction            
Step acquisition, ownership percentage including subsequent acquisition 34.00%          
Purchase price $ 14,890          
Related Party | OPI | Termination of Merger Agreement            
Related Party Transaction            
Amounts of transaction   $ 9,900        
Related Party | RMR LLC            
Related Party Transaction            
Related party transaction, closing cost     $ 6,080      
Related Party | AlerisLife Inc            
Related Party Transaction            
Investment in equity securities acquisition, share price (in dollars per share) | $ / shares           $ 1.31
RMR LLC | Year one            
Related Party Transaction            
Award vesting rights, percentage   20.00%        
RMR LLC | Year two            
Related Party Transaction            
Award vesting rights, percentage   20.00%        
RMR LLC | Year three            
Related Party Transaction            
Award vesting rights, percentage   20.00%        
RMR LLC | Year four            
Related Party Transaction            
Award vesting rights, percentage   20.00%        
RMR LLC | Year five            
Related Party Transaction            
Award vesting rights, percentage   20.00%        
Diversified Healthcare Trusts | ABP Trust and Adam D. Portnoy            
Related Party Transaction            
Ownership interest by noncontrolling owners   9.80%        
AlerisLife Inc | Related Party            
Related Party Transaction            
Ownership interest by noncontrolling owners         31.90%  
AlerisLife Inc | ABP Acquisition LLC And ABP Trust            
Related Party Transaction            
Ownership interest by noncontrolling owners         6.10%  
AlerisLife Inc | ABP Trust | Subsequent Event            
Related Party Transaction            
Ownership interest by parent 66.00%