Fair Value Measurements - Schedule of Sensitivity in the Fair Value of Senior Asset-Backed Securities to Adverse Changes in Key Assumptions (Details) - USD ($) $ in Thousands |
Jun. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Fair Value | $ 4,046,761 | $ 3,706,709 |
| Senior asset-backed securities related to Structured Program transactions | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Fair Value | 3,394,054 | 3,092,410 |
| 100 basis point increase | (37,308) | (32,467) |
| 200 basis point increase | $ (74,616) | $ (64,934) |
| Senior asset-backed securities related to Structured Program transactions | Weighted Average | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Expected remaining weighted-average life (in years) | 1 year 1 month 6 days | 1 year 1 month 6 days |