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Fair Value of Investments - Schedule of Net Change in Unrealized Gains on Investments (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2026 | Mar. 31, 2025
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Net change in unrealized gain (loss) | $ (170,537) | $ 77,076
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Net change in unrealized gain (loss)
First-lien senior secured debt investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Net change in unrealized gain (loss) | (101,741) | $ 51,375
Second-lien senior secured debt investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Net change in unrealized gain (loss) | (57,687) | (2,987)
Unsecured debt investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Net change in unrealized gain (loss) | (5,211) | 8,263
Specialty finance debt investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Net change in unrealized gain (loss) | (11) | 289
Preferred equity investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Net change in unrealized gain (loss) | (8,488) | 3,719
Common equity investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Net change in unrealized gain (loss) | 7,126 | 2,657
Specialty finance equity investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Net change in unrealized gain (loss) | $ (4,525) | $ 13,760

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