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Fair Value Measurement - Schedule of Carrying Values and Fair Values of Debt Instruments (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Carrying Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt instrument, fair value | $ 14,627,043 | $ 12,901,492
Carrying Value | Recourse debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt instrument, fair value | 797,901 | 863,646
Carrying Value | Senior debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt instrument, fair value | 4,573,857 | 4,738,594
Carrying Value | Subordinated debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt instrument, fair value | 3,227,361 | 2,667,010
Carrying Value | Securitization debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt instrument, fair value | 6,027,924 | 4,632,242
Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt instrument, fair value | 14,556,557 | 12,392,915
Fair Value | Recourse debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt instrument, fair value | 967,756 | 807,801
Fair Value | Senior debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt instrument, fair value | 4,537,614 | 4,681,858
Fair Value | Subordinated debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt instrument, fair value | 3,163,466 | 2,539,930
Fair Value | Securitization debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt instrument, fair value | $ 5,887,721 | $ 4,363,326

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