Quarterly report pursuant to Section 13 or 15(d)

Fair Value - Summary of HECM Buyouts (Detail)

v3.22.2
Fair Value - Summary of HECM Buyouts (Detail) - HECM Buyouts [Member]
 6 Months Ended 12 Months Ended
Jun. 30, 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 23.10% 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% 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 51.40% 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 3.70% 4.30%
Weighted Average [Member] | Discount 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]    
Discount rate 7.70% 4.10%