Quarterly report pursuant to Section 13 or 15(d)

Nonrecourse Debt, at Fair Value - Summary of Nonrecourse Debt at Fair Value (Detail)

v3.22.2.2
Nonrecourse Debt, at Fair Value - Summary of Nonrecourse Debt at Fair Value (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2022
Dec. 31, 2021
Debt Instrument [Line Items]    
Nonrecourse MSR financing liability, at fair value $ 59,800 $ 142,435
Nonrecourse commercial loan financing liability 153,770 107,744
Fair value adjustments (582,996) 39,379
Total nonrecourse debt, at fair value 6,745,526 6,111,242
Nonrecourse    
Debt Instrument [Line Items]    
Unpaid Principal Balance $ 7,114,952 5,821,684
Securitization of performing / nonperforming HECM loans    
Debt Instrument [Line Items]    
Issue Date July 2020 - August 2022  
Final Maturity Date July 2030 - August 2032  
Original Issue Amount $ 2,250,554  
Securitization of performing / nonperforming HECM loans | Nonrecourse    
Debt Instrument [Line Items]    
Unpaid Principal Balance $ 994,563 922,970
Securitization of performing / nonperforming HECM loans | Minimum    
Debt Instrument [Line Items]    
Interest Rate 2.69%  
Securitization of performing / nonperforming HECM loans | Maximum    
Debt Instrument [Line Items]    
Interest Rate 9.32%  
Securitization of non-agency reverse loans    
Debt Instrument [Line Items]    
Issue Date May 2018 - June 2022  
Final Maturity Date March 2050 - November 2069  
Original Issue Amount $ 7,537,674  
Securitization of non-agency reverse loans | Nonrecourse    
Debt Instrument [Line Items]    
Unpaid Principal Balance $ 5,851,878 4,630,203
Securitization of non-agency reverse loans | Minimum    
Debt Instrument [Line Items]    
Interest Rate 1.25%  
Securitization of non-agency reverse loans | Maximum    
Debt Instrument [Line Items]    
Interest Rate 4.50%  
Securitization of Fix & Flip loans    
Debt Instrument [Line Items]    
Issue Date April 2021  
Final Maturity Date May 2025  
Original Issue Amount $ 268,511  
Securitization of Fix & Flip loans | Nonrecourse    
Debt Instrument [Line Items]    
Unpaid Principal Balance $ 268,511 $ 268,511
Securitization of Fix & Flip loans | Minimum    
Debt Instrument [Line Items]    
Interest Rate 2.10%  
Securitization of Fix & Flip loans | Maximum    
Debt Instrument [Line Items]    
Interest Rate 5.40%