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
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Home Equity Conversion Mortgage Backed Security Related to Obligations At Fair Value [Line Items]      
Ginnie Mae loan pools - UPB $ 17,113,496   $ 16,875,437
Fair value adjustments 713,564   478,283
Total HMBS related obligations, at fair value $ 17,827,060   $ 17,353,720
Weighted average remaining life (in years) 4 years 4 years 1 month 6 days  
Weighted average interest rate 6.40%   6.60%