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
6 Months Ended
Jun. 30, 2024
Dec. 31, 2023
Debt Instrument [Line Items]    
Nonrecourse debt, at fair value $ 8,050,708 $ 7,904,200
Nonrecourse    
Debt Instrument [Line Items]    
Unpaid Principal Balance 8,199,948 8,087,453
Nonrecourse reverse loan financing liability 353,102 341,682
Nonrecourse commercial loan financing liability 19,527 26,661
Fair value adjustments $ (521,869) (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 $ 581,266 672,911
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 - April 2024  
Final Maturity Date May 2050 - April 2074  
Original Issue Amount $ 9,427,228  
Securitization of non-agency reverse loans | Nonrecourse    
Debt Instrument [Line Items]    
Unpaid Principal Balance $ 7,583,326 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 May 2024  
Final Maturity Date May 2026  
Original Issue Amount $ 39,016  
Securitization of commercial loans | Nonrecourse    
Debt Instrument [Line Items]    
Unpaid Principal Balance $ 35,356 $ 83,237
Securitization of commercial loans | Minimum    
Debt Instrument [Line Items]    
Interest Rate 9.49%