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
6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Home Equity Conversion Mortgage Backed Security Related to Obligations At Fair Value [Line Items]      
Ginnie Mae loan pools - UPB $ 16,194,586   $ 10,719,000
Fair value adjustments 470,949   277,755
Total HMBS related obligations, at fair value $ 16,665,535   $ 10,996,755
Weighted average remaining life (in years) 4 years 2 months 12 days 4 years  
Weighted average interest rate 5.90%   5.00%