Fair Value Measurements - Additional Information (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Long-term unsecured debt, carrying value	$ 86,302	$ 85,994
Long-term debt, Fair Value	79,670	84,821
Long-term secured debt, carrying value	56,801	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	352	5,267
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	5,248	7,388
MSR financing receivables
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Present value of expected incentive fee	$ 13,057	$ 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	0.97	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	0.15
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	0.16
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	0.064	0.056
Fair Value, Inputs, Level 3 | Single-Family Residential Properties
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Long-term debt, Fair Value	$ 49,438	$ 38,562
Long-term secured debt, carrying value	$ 56,801	$ 39,178
Fair Value, Inputs, Level 3 | Non-Agency MBS | Maximum
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Percentage of investment represented original collateral pool	5.00%	10.00%
Fair Value, Inputs, Level 3 | Mortgage Loans of Consolidated VIE | Maximum
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Percentage of loans represented original collateral pool	5.00%	10.00%