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Fair Value Measurement - Summary of Changes in Fair Value of Level 3 Assets By Investment Type (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Net Amortization of Premium/Discount $ 7,820 $ 11,062
Net Change in Unrealized Appreciation (Depreciation) for assets still held $ (81,751) $ (9,057)
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 $ (57,871) $ (6,586)
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 (5,034) 2,182
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 (12,893) 835
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 (536) 432
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 (6,303) 1,286
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 726 (7,183)
Warrants    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Net Change in Unrealized Appreciation (Depreciation) for assets still held 160 (23)
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] 282,547 401,517
Net Realized Gain (Loss) $ 21,330 $ (125,691)
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) $ (82,273) $ 106,668
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] $ (295,627) $ (598,618)
Net Amortization of Premium/Discount 7,814 11,050
Transfers In [3] 34,011 18,015
Transfers Out [3] 0 0
Ending Balance 3,175,329 3,244,938
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] 239,414 365,336
Net Realized Gain (Loss) (174) (94,768)
Net Change in Unrealized Appreciation (Depreciation) (53,176) 78,152
Sales and Settlements [2] (258,087) (588,881)
Net Amortization of Premium/Discount 6,827 10,421
Transfers In [3] 34,011 18,015
Transfers Out [3] 0 0
Ending Balance 2,943,461 2,924,958
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] 6,550 19,162
Net Realized Gain (Loss) 0 0
Net Change in Unrealized Appreciation (Depreciation) (5,051) 2,181
Sales and Settlements [2] (4,646) (371)
Net Amortization of Premium/Discount 146 459
Transfers In [3] 0 0
Transfers Out [3] 0 0
Ending Balance 132,155 187,336
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] 34,926 1,819
Net Realized Gain (Loss) 21,504 (9,031)
Net Change in Unrealized Appreciation (Depreciation) (18,093) 9,865
Sales and Settlements [2] (31,548) 0
Net Amortization of Premium/Discount 415 (80)
Transfers In [3] 0 0
Transfers Out [3] 0 0
Ending Balance 55,118 49,359
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] 1,549 109
Net Realized Gain (Loss) 0 (1,055)
Net Change in Unrealized Appreciation (Depreciation) (536) 1,553
Sales and Settlements [2] (1,346) (9,366)
Net Amortization of Premium/Discount 426 250
Transfers In [3] 0 0
Transfers Out [3] 0 0
Ending Balance 8,569 8,281
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 8,698
Net Realized Gain (Loss) 0 (778)
Net Change in Unrealized Appreciation (Depreciation) (6,303) 2,064
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 20,231 41,230
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 (20,059)
Net Change in Unrealized Appreciation (Depreciation) 726 12,876
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 15,388 33,376
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) 160 (23)
Sales and Settlements [2] 0 0
Net Amortization of Premium/Discount 0 0
Transfers In [3] 0 0
Transfers Out [3] 0  
Ending Balance $ 407 $ 398
[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.