Annual report pursuant to Section 13 and 15(d)

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

v3.24.0.1
Nonrecourse Debt, at Fair Value - Summary of Nonrecourse Debt at Fair Value (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Debt Instrument [Line Items]    
Unpaid Principal Balance $ 25,838,677 $ 19,421,909
Nonrecourse debt, at fair value 7,904,200 7,343,177
Nonrecourse    
Debt Instrument [Line Items]    
Unpaid Principal Balance 8,087,453 7,819,992
Nonrecourse MSR financing liability, at fair value 0 60,562
Nonrecourse reverse loan financing liability 341,682 0
Nonrecourse commercial loan financing liability 26,661 105,291
Fair value adjustments $ (551,596) (642,668)
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]    
Unpaid Principal Balance $ 672,911 953,336
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 - December 2023  
Final Maturity Date May 2050 - August 2073  
Original Issue Amount $ 9,114,051  
Securitization of non-agency reverse loans | Nonrecourse    
Debt Instrument [Line Items]    
Unpaid Principal Balance $ 7,331,305 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 commercial loans    
Debt Instrument [Line Items]    
Issue Date April 2021  
Final Maturity Date May 2025  
Original Issue Amount $ 268,511  
Securitization of commercial loans | Nonrecourse    
Debt Instrument [Line Items]    
Unpaid Principal Balance $ 83,237 $ 268,511
Securitization of commercial loans | Minimum    
Debt Instrument [Line Items]    
Interest Rate 2.10%  
Securitization of commercial loans | Maximum    
Debt Instrument [Line Items]    
Interest Rate 5.40%