Business Segment Information - Schedule of Reconciliation of Contribution Profit (Loss) to Loss Before Tax (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Segment Reporting Information [Line Items]
Corporate/Other total net income (loss)	$ 598,618	$ 498,018	$ 1,243,613	$ 970,176
Share-based compensation expense			(116,139)	(140,104)
Depreciation and amortization expense			(98,162)	(95,451)
Income (loss) before income taxes	15,340	(49,329)	109,566	(85,388)
Reportable segments
Segment Reporting Information [Line Items]
Reportable segments total contribution profit	284,309	196,116	559,944	396,636
Corporate/Other total net income (loss)	612,275	517,116	1,187,668	1,013,185
Intercompany expenses	8,295	4,954	15,296	8,695
Servicing rights – change in valuation inputs or assumptions	1,654	8,601	6,880	20,685
Residual interests classified as debt – change in valuation inputs or assumptions	(1)	602	(74)	513
Expenses not allocated to segments
Segment Reporting Information [Line Items]
Corporate/Other total net income (loss)	(13,657)	(19,098)	55,945	(43,009)
Share-based compensation expense	(61,057)	(75,878)	(116,139)	(140,104)
Employee-related costs	(67,786)	(55,605)	(130,170)	(117,419)
Depreciation and amortization expense	(49,623)	(50,130)	(98,162)	(95,451)
Other corporate and unallocated expenses
Segment Reporting Information [Line Items]
Other corporate and unallocated expenses	$ (86,794)	$ (58,891)	$ (183,954)	$ (115,934)