Quarterly report pursuant to Section 13 or 15(d)

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

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Mortgage Loans Held for Investment, at Fair Value - Schedule of Mortgage Loans Held For Investment At Fair Value (Detail) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Mortgage Loans Held for Investment At Fair Value [Line Items]    
Fair value adjustments $ 143,101 $ 72,265
Total mortgage loans held for investment, at fair value 1,225,090 730,821
Reverse Mortgage Loans [Member]    
Mortgage Loans Held for Investment At Fair Value [Line Items]    
Mortgage loans held for investment 879,794 589,429
Commercial Mortgage Loans [Member]    
Mortgage Loans Held for Investment At Fair Value [Line Items]    
Mortgage loans held for investment $ 202,195 $ 69,127