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Fair Value Measurement - Summary of Changes in Fair Value of Level 3 Assets By Investment Type (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2026 | Mar. 31, 2025
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Net Change in Unrealized Appreciation (Depreciation) for assets still held |  | $ (38,040) | $ (14,942)
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Gain (Loss) on Investments | Gain (Loss) on Investments
1st Lien/Senior Secured Debt |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Net Change in Unrealized Appreciation (Depreciation) for assets still held |  | $ (31,868) | $ (11,362)
1st Lien/Last-Out Unitranche |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Net Change in Unrealized Appreciation (Depreciation) for assets still held |  | (3,174) | 479
2nd Lien/Senior Secured Debt |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Net Change in Unrealized Appreciation (Depreciation) for assets still held |  | 4,111 | (1,370)
Unsecured Debt |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Net Change in Unrealized Appreciation (Depreciation) for assets still held |  | (374) | 252
Preferred Stock |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Net Change in Unrealized Appreciation (Depreciation) for assets still held |  | (6,410) | 725
Common Stock |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Net Change in Unrealized Appreciation (Depreciation) for assets still held |  | (539) | (3,706)
Warrants |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Net Change in Unrealized Appreciation (Depreciation) for assets still held |  | 214 | 40
Level 3 |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Beginning Balance |  | 3,207,527 | 3,431,997
Purchases | [1] | 102,312 | 192,299
Net Realized Gain (Loss) |  | $ (46) | $ (44,472)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Debt and Equity Securities, Realized Gain (Loss) | Debt and Equity Securities, Realized Gain (Loss)
Net Change in Unrealized Appreciation (Depreciation) |  | $ (38,449) | $ 27,287
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration] |  | Debt and Equity Securities, Unrealized Gain (Loss) | Debt and Equity Securities, Unrealized Gain (Loss)
Sales and Settlements | [2] | $ (97,998) | $ (266,275)
Net Amortization of Premium/Discount |  | 3,184 | 5,011
Transfers In | [3] | 0 | 0
Transfers Out | [3] | (28,116) | 0
Ending Balance |  | 3,148,414 | 3,345,847
Level 3 | 1st Lien/Senior Secured Debt |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Beginning Balance |  | 2,974,646 | 3,136,683
Purchases | [1] | 97,941 | 168,013
Net Realized Gain (Loss) |  | (46) | (20,682)
Net Change in Unrealized Appreciation (Depreciation) |  | (32,259) | 7,078
Sales and Settlements | [2] | (93,352) | (266,172)
Net Amortization of Premium/Discount |  | 2,719 | 4,823
Transfers In | [3] | 0 | 0
Transfers Out | [3] | (28,116) | 0
Ending Balance |  | 2,921,533 | 3,029,743
Level 3 | 1st Lien/Last-Out Unitranche |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Beginning Balance |  | 135,156 | 165,905
Purchases | [1] | 3,474 | 16,670
Net Realized Gain (Loss) |  | 0 | (0)
Net Change in Unrealized Appreciation (Depreciation) |  | (3,192) | 478
Sales and Settlements | [2] | (4,646) | (103)
Net Amortization of Premium/Discount |  | 94 | 225
Transfers In | [3] | 0 | 0
Transfers Out | [3] | 0 | 0
Ending Balance |  | 130,886 | 183,175
Level 3 | 2nd Lien/Senior Secured Debt |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Beginning Balance |  | 47,914 | 46,786
Purchases | [1] | 678 | 1,223
Net Realized Gain (Loss) |  | 0 | (9,031)
Net Change in Unrealized Appreciation (Depreciation) |  | 4,111 | 7,661
Sales and Settlements | [2] | 0 | 0
Net Amortization of Premium/Discount |  | 63 | (39)
Transfers In | [3] | (0) | 0
Transfers Out | [3] | 0 | 0
Ending Balance |  | 52,766 | 46,600
Level 3 | Unsecured Debt |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Beginning Balance |  | 8,476 | 16,790
Purchases | [1] | 111 | 0
Net Realized Gain (Loss) |  | 0 | (0)
Net Change in Unrealized Appreciation (Depreciation) |  | (374) | 252
Sales and Settlements | [2] | 0 | 0
Net Amortization of Premium/Discount |  | 308 | 2
Transfers In | [3] | 0 | (0)
Transfers Out | [3] | 0 | 0
Ending Balance |  | 8,521 | 17,044
Level 3 | Preferred Stock |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Beginning Balance |  | 26,426 | 31,246
Purchases | [1] | 108 | 0
Net Realized Gain (Loss) |  | 0 | 0
Net Change in Unrealized Appreciation (Depreciation) |  | (6,410) | 725
Sales and Settlements | [2] | 0 | 0
Net Amortization of Premium/Discount |  | 0 | (0)
Transfers In | [3] | 0 | (0)
Transfers Out | [3] | 0 | 0
Ending Balance |  | 20,124 | 31,971
Level 3 | Common Stock |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Beginning Balance |  | 14,662 | 34,166
Purchases | [1] | 0 | 6,393
Net Realized Gain (Loss) |  | 0 | (14,759)
Net Change in Unrealized Appreciation (Depreciation) |  | (539) | 11,053
Sales and Settlements | [2] | 0 | 0
Net Amortization of Premium/Discount |  | 0 | (0)
Transfers In | [3] | 0 | (0)
Transfers Out | [3] | 0 | 0
Ending Balance |  | 14,123 | 36,853
Level 3 | Warrants |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Beginning Balance |  | 247 | 421
Purchases | [1] | 0 | 0
Net Realized Gain (Loss) |  | 0 | 0
Net Change in Unrealized Appreciation (Depreciation) |  | 214 | 40
Sales and Settlements | [2] | 0 | 0
Net Amortization of Premium/Discount |  | 0 | (0)
Transfers In | [3] | 0 | (0)
Transfers Out | [3] | 0 |
Ending Balance |  | $ 461 | $ 461
[1] | Purchases may include PIK, securities received in corporate actions and restructurings.
[2] | Sales and Settlements may include securities delivered in corporate actions and restructuring of investments.
[3] | Transfers in (out) of Level 3 are due to a decrease (increase) in the quantity and reliability of broker quotes obtained by the Investment Adviser.

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