Financial Instruments and Fair Value Measurements - Summary of Gains or Losses Recorded Related to Eligible Financial Instruments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]
Total net loss included in "Realized and unrealized losses, net of recoveries"	$ 17,815	$ 25,703	$ 45,781	$ 49,836
Fair Value, Asset (Liability), Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Gain (Loss) on Investments	Gain (Loss) on Investments	Gain (Loss) on Investments	Gain (Loss) on Investments
Debt of securitized VIEs
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]
Financial Liabilities Gain (Loss)	$ (2,567)	$ 335	$ (7,053)	$ (6,916)
Finance Receivables of CFEs
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]
Financial Assets Gain (Loss)	16,689	23,103	43,233	54,987
Finance Receivables at Fair Value
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]
Financial Assets Gain (Loss)	3,758	2,027	9,758	605
Beneficial Interests in Securitizations
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]
Financial Assets Gain (Loss)	$ (65)	$ 238	$ (157)	$ 1,160