Quarterly report pursuant to Section 13 or 15(d)

HMBS Related Obligations, at Fair Value - Summary of HMBS Related Obligations, At Fair Value (Detail)

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HMBS Related Obligations, at Fair Value - Summary of HMBS Related Obligations, At Fair Value (Detail) - Home Equity Conversion Mortgage Backed Security - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2023
Dec. 31, 2022
Home Equity Conversion Mortgage Backed Security Related to Obligations At Fair Value [Line Items]    
Ginnie Mae loan pools - UPB $ 16,522,369 $ 10,719,000
Fair value adjustments 455,799 277,755
Total HMBS related obligations, at fair value $ 16,978,168 $ 10,996,755
Weighted average remaining life (in years) 3 years 10 months 24 days 4 years
Weighted average interest rate 6.40% 5.00%