Fair Value Measurement - Schedule of Carrying Values and Fair Values of Debt Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total	$ 14,695,571	$ 12,901,492
Carrying Value | Recourse debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total	717,529	863,646
Carrying Value | Senior debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total	4,759,238	4,738,594
Carrying Value | Subordinated debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total	3,279,002	2,667,010
Carrying Value | Securitization debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total	5,939,802	4,632,242
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total	14,741,305	12,392,915
Fair Value | Recourse debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total	919,709	807,801
Fair Value | Senior debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total	4,739,577	4,681,858
Fair Value | Subordinated debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total	3,220,986	2,539,930
Fair Value | Securitization debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total	$ 5,861,033	$ 4,363,326