Annual report pursuant to Section 13 and 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
Dec. 31, 2021
Dec. 31, 2020
Mortgage Loans Held for Investment At Fair Value [Line Items]    
Fair value adjustments $ 126,635 $ 72,265
Total loans held for investment, at fair value 1,031,328 730,821
Reverse Mortgage Loans [Member]    
Mortgage Loans Held for Investment At Fair Value [Line Items]    
Loans held for investment 815,426 589,429
Commercial Mortgage Loans [Member]    
Mortgage Loans Held for Investment At Fair Value [Line Items]    
Loans held for investment $ 89,267 $ 69,127