Quarterly report pursuant to Section 13 or 15(d)

Loans Held for Investment, at Fair Value - Schedule of Mortgage Loans Held For Investment At Fair Value (Detail)

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Loans Held for Investment, at Fair Value - Schedule of Mortgage Loans Held For Investment At Fair Value (Detail) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Fair value adjustments $ 38,098 $ 39,825
Loans held for investment, at fair value 736,968 907,998
Reverse mortgage loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment - UPB 685,924 724,800
Commercial mortgage loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment - UPB $ 12,946 $ 143,373