Nonrecourse Debt, at Fair Value - Schedule of Nonrecourse Debt at Fair Value (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Total nonrecourse debt, at fair value	$ 9,736,493	$ 8,954,068
Nonrecourse
Debt Instrument [Line Items]
UPB	9,584,101	8,989,848
Nonrecourse loan financing liability	376,423	374,071
Fair value adjustments	$ (224,031)	(409,851)
Securitization of non-agency reverse mortgage loans
Debt Instrument [Line Items]
Issue Date	May 2018 - September 2025
Final Maturity Date	December 2053 - September 2075
Original Issue Amount	$ 10,220,880
Securitization of non-agency reverse mortgage loans | Nonrecourse
Debt Instrument [Line Items]
UPB	$ 8,834,991	8,304,568
Securitization of non-agency reverse mortgage loans | Minimum
Debt Instrument [Line Items]
Interest Rate	2.00%
Securitization of non-agency reverse mortgage loans | Maximum
Debt Instrument [Line Items]
Interest Rate	7.00%
Securitization of performing/nonperforming HECM loans
Debt Instrument [Line Items]
Issue Date	October 2024 - November 2025
Final Maturity Date	October 2034 - November 2035
Original Issue Amount	$ 1,135,800
Securitization of performing/nonperforming HECM loans | Nonrecourse
Debt Instrument [Line Items]
UPB	$ 749,110	677,035
Securitization of performing/nonperforming HECM loans | Minimum
Debt Instrument [Line Items]
Interest Rate	4.00%
Securitization of performing/nonperforming HECM loans | Maximum
Debt Instrument [Line Items]
Interest Rate	6.00%
Securitization of commercial loans | Nonrecourse
Debt Instrument [Line Items]
UPB	$ 0	$ 8,245