v3.26.1
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.