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Related Person Transactions - Management Agreements (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
Jul. 01, 2019
USD ($)
$ / shares
shares
Dec. 31, 2021
agreement
First Anniversary Vesting Percentage    
Related Party Transaction [Line Items]    
Vesting percentage   20.00%
Second Anniversary Vesting Percentage    
Related Party Transaction [Line Items]    
Vesting percentage   20.00%
Third Anniversary Vesting Percentage    
Related Party Transaction [Line Items]    
Vesting percentage   20.00%
Fourth Anniversary Vesting Percentage    
Related Party Transaction [Line Items]    
Vesting percentage   20.00%
Fifth Anniversary Vesting Percentage    
Related Party Transaction [Line Items]    
Vesting percentage   20.00%
Amended and restated business management agreement | RMR LLC    
Related Party Transaction [Line Items]    
Number of management agreements | agreement   2
Class A common shares | RMR Inc.    
Related Party Transaction [Line Items]    
Public offering price (in dollars per share) | $ / shares $ 40.00  
Proceeds from sale | $ $ 93,568  
Class A common shares | RMR LLC | RMR Inc.    
Related Party Transaction [Line Items]    
Number of common shares owned (in shares) | shares 2,503,777