Quarterly report pursuant to Section 13 or 15(d)

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

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Nonrecourse Debt, at Fair Value - Summary of Nonrecourse Debt at Fair Value (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Debt Instrument [Line Items]    
Nonrecourse debt, at fair value $ 7,897,896 $ 7,904,200
Nonrecourse    
Debt Instrument [Line Items]    
Unpaid Principal Balance 8,102,330 8,087,453
Nonrecourse reverse loan financing liability 345,287 341,682
Nonrecourse commercial loan financing liability 22,295 26,661
Fair value adjustments $ (572,016) (551,596)
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 $ 623,988 672,911
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 - February 2024  
Final Maturity Date May 2050 - February 2074  
Original Issue Amount $ 9,192,451  
Securitization of non-agency reverse loans | Nonrecourse    
Debt Instrument [Line Items]    
Unpaid Principal Balance $ 7,430,291 7,331,305
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 $ 48,051 $ 83,237
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%