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, 2021
Dec. 31, 2020
Home Equity Conversion Mortgage Backed Security Related Obligations At Fair Value [Line Items]    
Ginnie Mae loan pools - UPB $ 9,617,079 $ 9,045,104
Fair value adjustments 599,231 743,564
Total HMBS related obligations, at fair value $ 10,216,310 $ 9,788,668
Weighted average remaining life 4 years 4 months 24 days 4 years 6 months
Weighted average interest rate 2.50% 3.00%