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Related Party Transactions and Investments in Non-Consolidated Entities - Management fees and interest income from loans (Details) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Sponsored REITs      
Asset management fees, low end of range (as a percent) 1.00%    
Asset management fees, high end of range (as a percent) 5.00%    
Notice period for cancellation of applicable contracts 30 days    
Type of revenue Asset management fees Asset management fees Asset management fees
Impairment of Sponsored REIT $ 0    
Asset management fees      
Sponsored REITs      
Revenue $ 100,000 $ 100,000 $ 200,000