Quarterly report pursuant to Section 13 or 15(d)

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

v3.23.3
Nonrecourse Debt, at Fair Value - Summary of Nonrecourse Debt at Fair Value (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2023
Dec. 31, 2022
Debt Instrument [Line Items]    
Nonrecourse MSR financing liability, at fair value $ 0 $ 60,562
Nonrecourse reverse loan financing liability 334,658 0
Nonrecourse commercial loan financing liability 30,927 105,291
Fair value adjustments (769,097) (642,668)
Total nonrecourse debt, at fair value 7,812,570 7,343,177
Nonrecourse    
Debt Instrument [Line Items]    
Total consolidated VIE nonrecourse debt UPB $ 8,216,082 7,819,992
Securitization of performing / nonperforming HECM loans    
Debt Instrument [Line Items]    
Issue Date February 2022 - August 2022  
Final Maturity Date February 2032 - August 2032  
Original Issue Amount $ 1,084,935  
Securitization of performing / nonperforming HECM loans | Nonrecourse    
Debt Instrument [Line Items]    
Total consolidated VIE nonrecourse debt UPB $ 723,315 953,336
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 - August 2023  
Final Maturity Date May 2050 - August 2073  
Original Issue Amount $ 9,083,888  
Securitization of non-agency reverse loans | Nonrecourse    
Debt Instrument [Line Items]    
Total consolidated VIE nonrecourse debt UPB $ 7,336,875 6,598,145
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]    
Total consolidated VIE nonrecourse debt UPB $ 155,892 $ 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%