Annual report pursuant to Section 13 and 15(d)

Loans Held for Investment, Subject to Nonrecourse Debt, at Fair Value - Schedule of Mortgage Loans Held For Investment, Subject to Nonrecourse Debt, at Fair Value (Detail)

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Loans Held for Investment, Subject to Nonrecourse Debt, at Fair Value - Schedule of Mortgage Loans Held For Investment, Subject to Nonrecourse Debt, at Fair Value (Detail) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Mortgage Loans Held For Investment Subject To Nonrecourse Debt At Fair Value [Line Items]    
Fair value adjustments $ 663,927 $ 605,018
Total loans held for investment, subject to nonrecourse debt, at fair value 6,218,194 5,396,167
Reverse mortgage loans    
Mortgage Loans Held For Investment Subject To Nonrecourse Debt At Fair Value [Line Items]    
Loans held for investment, subject to nonrecourse debt 5,165,479 4,457,805
Commercial mortgage loans    
Mortgage Loans Held For Investment Subject To Nonrecourse Debt At Fair Value [Line Items]    
Loans held for investment, subject to nonrecourse debt $ 388,788 $ 333,344