Fair Value Measurements - Additional Information (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Long-term unsecured debt, carrying value $ 85,994 $ 73,027
Long-term debt, Fair Value 84,821 69,904
Long-term secured debt, carrying value 39,178  
Equity Securities of Publicly Traded Companies    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investments in equity securities and investment funds measured at fair value 5,267 10,821
Private Equity Funds    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investments in equity securities and investment funds measured at fair value 7,388 $ 6,869
MSR financing receivables    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Present value of expected incentive fee $ 3,820  
Fair Value, Inputs, Level 3 | Private Equity Funds | Stock Price to Net Asset Multiple    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair value discount rate 0.95 0.95
Fair Value, Inputs, Level 3 | Private Equity Funds | Discount Factor for Lack of Marketability and Control    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair value discount rate 0.15 0.10
Fair Value, Inputs, Level 3 | Private Equity Funds | Cost of Equity Discount Rate    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair value discount rate 0.16 0.15
Fair Value, Inputs, Level 3 | Commercial Mortgage Loan Investment    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Estimated weighted average rate of default 0.00% 0.00%
Fair value discount rate 0.056 0.063
Fair Value, Inputs, Level 3 | Single Family properties    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Long-term debt, Fair Value $ 38,562  
Long-term secured debt, carrying value $ 39,178