Quarterly report pursuant to Section 13 or 15(d)

Fair Value - Summary of HECM Buyouts (Detail)

v3.22.1
Fair Value - Summary of HECM Buyouts (Detail) - HECM Buyouts [Member]
 3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Minimum [Member] | Loss frequency [Member]    
Fair Value HECM Buyouts Securitized Nonperforming Mortgage Loans Held For Investment Subject To Nonrecourse Debt Measured On Recurring And Nonrecurring Basis Fair Value Measurement [Line Items]    
Loss frequency   25.00%
Minimum [Member] | Loss severity [Member]    
Fair Value HECM Buyouts Securitized Nonperforming 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 frequency [Member]    
Fair Value HECM Buyouts Securitized Nonperforming Mortgage Loans Held For Investment Subject To Nonrecourse Debt Measured On Recurring And Nonrecurring Basis Fair Value Measurement [Line Items]    
Loss frequency   100.00%
Maximum [Member] | Loss severity [Member]    
Fair Value HECM Buyouts Securitized Nonperforming 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 Nonperforming Mortgage Loans Held For Investment Subject To Nonrecourse Debt Measured On Recurring And Nonrecurring Basis Fair Value Measurement [Line Items]    
Conditional repayment rate 39.70% 41.20%
Weighted Average [Member] | Loss frequency [Member]    
Fair Value HECM Buyouts Securitized Nonperforming Mortgage Loans Held For Investment Subject To Nonrecourse Debt Measured On Recurring And Nonrecurring Basis Fair Value Measurement [Line Items]    
Loss frequency 60.50% 59.50%
Weighted Average [Member] | Loss severity [Member]    
Fair Value HECM Buyouts Securitized Nonperforming Mortgage Loans Held For Investment Subject To Nonrecourse Debt Measured On Recurring And Nonrecurring Basis Fair Value Measurement [Line Items]    
Loss severity 3.10% 4.30%
Discount rate 5.80% 4.10%