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Business and Property Management Agreements with RMR LLC (Details)
 1 Months Ended 12 Months Ended
Dec. 23, 2021
Dec. 31, 2021
USD ($)
employee
Dec. 31, 2021
USD ($)
employee
lease
agreement
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Mar. 31, 2017
Related Party Transaction            
Number of employees | employee   0 0      
Professional fees     $ 13,161,000 $ 13,805,000 $ 13,373,000  
Seaport Innovation LLC | Joint Venture            
Related Party Transaction            
Additional equity joint venture percentage 35.00% 35.00%        
Equity method investment ownership percentage 20.00% 20.00% 20.00%     55.00%
RMR LLC            
Related Party Transaction            
Business management fees incurred     $ 23,378,000 20,629,000 27,399,000  
Recognized amortization of the liability     $ 2,974,000 2,974,000 2,974,000  
Management agreement fee payments         40,642,000  
Percentage of property management fees payable     3.00%      
Construction supervision fees payable under property management agreement as a percentage of construction costs   5.00% 5.00%      
Property management and construction supervision fees     $ 12,504,000 13,802,000 13,141,000  
Amortization of liability related to property management and construction supervision fees     797,000 797,000 797,000  
Party transaction property management and construction supervision fees capitalized   $ 2,820,000 $ 2,820,000 3,718,000 2,436,000  
Period over which transition services will be provided by the related party after termination of the agreement     120 days      
RMR LLC | Operating Expense            
Related Party Transaction            
Property management and construction supervision fees     $ 9,684,000 $ 10,084,000 $ 10,705,000  
RMR LLC | Senior Living Communities            
Related Party Transaction            
Number of consecutive renewal terms of agreement | agreement     2      
RMR LLC | Amended Agreement            
Related Party Transaction            
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%      
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%      
Threshold amount of other real estate investments for payment of base management fee   $ 250,000,000 $ 250,000,000      
Base management fee payable as a percentage of average market capitalization exceeding specified amount   0.50% 0.50%      
Threshold amount of average market capitalization for payment of base management fee   $ 250,000,000 $ 250,000,000      
Base management fee payable as a percentage of average closing price per share of common shares on NYSE   0.70% 0.70%      
Base management fee payable as a percentage of aggregate book value of real estate assets or transferred assets   0.50% 0.50%      
Incentive management fee payable (as a percent)   12.00% 12.00%      
Period of measurement     3 years      
Top consecutive trading days     10 days      
Consecutive trading days     30 days      
Management agreement incentive fee payable   $ 0 $ 0      
Incentive management fee cap on common shares   1.50% 1.50%      
RMR LLC | Amended Agreement | Up C Transaction            
Related Party Transaction            
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     1      
Number of RMR LLC terminated management agreements for good cause before termination fee is incurred | lease     1      
Number of terminated management agreements for a performance reason before termination fee is incurred | lease     1      
Termination fee remaining term assumption     10 years      
RMR LLC | Maximum            
Related Party Transaction            
Threshold amount of real estate investments for payment of base management fee   $ 250,000,000 $ 250,000,000      
Base management fee payable, average market capitalization   $ 250,000,000 $ 250,000,000      
RMR LLC | Maximum | Amended Agreement | Up C Transaction            
Related Party Transaction            
Termination fee term     20 years      
RMR LLC | Minimum | Amended Agreement | Up C Transaction            
Related Party Transaction            
Termination fee term     19 years      
RMR LLC | SNL US REIT Healthcare Index | Maximum | Amended Agreement            
Related Party Transaction            
Incentive management fee reduction, basis spread     5.00%      
RMR LLC | SNL US REIT Healthcare Index | Minimum | Amended Agreement            
Related Party Transaction            
Incentive management fee reduction, basis spread     2.00%