Financial Instruments and Fair Value Measurements - Schedule of Reconciliation of Financial Assets Measured at Fair Value on a Recurring Basis Using Level 3 Inputs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Finance Receivables of Consolidated CFEs
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Losses included in realized and unrealized losses	$ 16,689	$ 23,103	$ 43,233	$ 54,987
Finance Receivables of Consolidated CFEs | Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair Value, Beginning Balance			316,998	77,904
Reclassification of finance receivables held for sale to finance receivables at fair value, net				248,081
Transfer within Level 3 categories			53,899	24,175
Consolidation of VIEs				180,706
Losses included in realized and unrealized losses			(52,017)	(67,035)
Paydowns			(84,821)	(117,002)
Other			10,922	18,965
Fair Value, Ending Balance	244,981	365,794	244,981	365,794
Finance Receivables at Fair Value
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Losses included in realized and unrealized losses	3,758	2,027	9,758	605
Finance Receivables at Fair Value | Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair Value, Beginning Balance			31,672	75,270
Transfer within Level 3 categories			(53,899)	(24,175)
Losses included in realized and unrealized losses			(14,956)	(1,349)
Issuances, net of discount			322,853	3,392
Paydowns			(44,786)	(19,641)
Other			1,708	1,406
Fair Value, Ending Balance	242,592	$ 34,903	242,592	$ 34,903
Securitization Debt of Consolidated CFEs | Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Transfers into Level 3			20,864
Losses included in realized and unrealized losses			(3,939)
Fair Value, Ending Balance	$ 16,925		$ 16,925