Quarterly report pursuant to Section 13 or 15(d)

Fair Value - Summary of Inventory Buyouts (Detail)

v3.22.2
Fair Value - Summary of Inventory Buyouts (Detail) - Inventory Buyouts [Member]
 6 Months Ended 12 Months Ended
Jun. 30, 2022
Dec. 31, 2021
Minimum [Member] | Loss frequency [Member]    
Fair Value Inventory Buyouts Classified As Reverse Mortgage Loans Held For Investment Measured On Recurring And Nonrecurring Basis Fair Value Measurement [Line Items]    
Loss frequency 23.10%  
Minimum [Member] | Loss severity [Member]    
Fair Value Inventory Buyouts Classified As Reverse Mortgage Loans Held For Investment Measured On Recurring And Nonrecurring Basis Fair Value Measurement [Line Items]    
Loss severity 2.40% 3.10%
Maximum [Member] | Loss frequency [Member]    
Fair Value Inventory Buyouts Classified As Reverse Mortgage Loans Held For Investment Measured On Recurring And Nonrecurring Basis Fair Value Measurement [Line Items]    
Loss frequency 100.00%  
Maximum [Member] | Loss severity [Member]    
Fair Value Inventory Buyouts Classified As Reverse Mortgage Loans Held For Investment 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 Inventory Buyouts Classified As Reverse Mortgage Loans Held For Investment Measured On Recurring And Nonrecurring Basis Fair Value Measurement [Line Items]    
Conditional repayment rate 41.20% 43.20%
Weighted Average [Member] | Loss frequency [Member]    
Fair Value Inventory Buyouts Classified As Reverse Mortgage Loans Held For Investment Measured On Recurring And Nonrecurring Basis Fair Value Measurement [Line Items]    
Loss frequency 47.40% 59.40%
Weighted Average [Member] | Loss severity [Member]    
Fair Value Inventory Buyouts Classified As Reverse Mortgage Loans Held For Investment Measured On Recurring And Nonrecurring Basis Fair Value Measurement [Line Items]    
Loss severity 4.70% 3.80%
Weighted Average [Member] | Discount rate [Member]    
Fair Value Inventory Buyouts Classified As Reverse Mortgage Loans Held For Investment Measured On Recurring And Nonrecurring Basis Fair Value Measurement [Line Items]    
Discount rate 7.70% 4.10%