Quarterly report pursuant to Section 13 or 15(d)

Fair Value - Summary of HECM Buyouts Securitized (Detail)

v3.22.1
Fair Value - Summary of HECM Buyouts Securitized (Detail) - HECM Buyouts Securitized [Member]
 3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Minimum [Member] | Loss severity [Member]    
Fair Value HECM Buyouts Securitized Performing Mortgage Loans Held For Investment Subject To Nonrecourse Debt Measured On Recurring And Nonrecurring Basis Fair Value Measurement [Line Items]    
Loss severity 2.40% 3.10%
Maximum [Member] | Loss severity [Member]    
Fair Value HECM Buyouts Securitized Performing Mortgage Loans Held For Investment Subject To Nonrecourse Debt Measured On Recurring And Nonrecurring Basis Fair Value Measurement [Line Items]    
Loss severity 6.90% 7.70%
Weighted Average [Member] | Conditional repayment rate [Member]    
Fair Value HECM Buyouts Securitized Performing Mortgage Loans Held For Investment Subject To Nonrecourse Debt Measured On Recurring And Nonrecurring Basis Fair Value Measurement [Line Items]    
Conditional repayment rate 13.40% 13.30%
Weighted Average [Member] | Loss severity [Member]    
Fair Value HECM Buyouts Securitized Performing Mortgage Loans Held For Investment Subject To Nonrecourse Debt Measured On Recurring And Nonrecurring Basis Fair Value Measurement [Line Items]    
Loss severity 6.90% 7.70%
Weighted Average [Member] | Discount rate [Member]    
Fair Value HECM Buyouts Securitized Performing Mortgage Loans Held For Investment Subject To Nonrecourse Debt Measured On Recurring And Nonrecurring Basis Fair Value Measurement [Line Items]    
Discount rate 5.00% 3.70%
Weighted Average [Member] | Weighted average remaining life in years [Member]    
Fair Value HECM Buyouts Securitized Performing Mortgage Loans Held For Investment Subject To Nonrecourse Debt Measured On Recurring And Nonrecurring Basis Fair Value Measurement [Line Items]    
Weighted average remaining life in years 9 years 9 years