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, 2025	Jun. 30, 2024
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Net Change in Unrealized Appreciation (Depreciation) for assets still held		$ (9,057)	$ (119,886)
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		$ (6,586)	$ (105,050)
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		2,182	478
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		835	5,728
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		432	(18,730)
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		1,286	1,082
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		(7,183)	(3,451)
Warrants
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Net Change in Unrealized Appreciation (Depreciation) for assets still held		(23)	57
Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Beginning Balance		3,431,997	3,343,635
Purchases	[1]	401,517	627,679
Net Realized Gain (Loss)		(125,691)	(49,665)
Net Change in Unrealized Appreciation (Depreciation)		106,668	(93,222)
Sales and Settlements	[2]	(598,618)	(436,441)
Net Amortization of Premium/Discount		11,050	12,947
Transfers In	[3]	18,015	6,510
Ending Balance		3,244,938	3,411,443
Level 3 | 1st Lien/Senior Secured Debt
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Beginning Balance		3,136,683	3,036,965
Purchases	[1]	365,336	599,413
Net Realized Gain (Loss)		(94,768)	(48,131)
Net Change in Unrealized Appreciation (Depreciation)		78,152	(75,846)
Sales and Settlements	[2]	(588,881)	(392,018)
Net Amortization of Premium/Discount		10,421	11,812
Transfers In	[3]	18,015	6,510
Ending Balance		2,924,958	3,138,705
Level 3 | 1st Lien/Last-Out Unitranche
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Beginning Balance		165,905	144,743
Purchases	[1]	19,162	15,176
Net Change in Unrealized Appreciation (Depreciation)		2,181	478
Sales and Settlements	[2]	(371)	(205)
Net Amortization of Premium/Discount		459	407
Ending Balance		187,336	160,599
Level 3 | 2nd Lien/Senior Secured Debt
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Beginning Balance		46,786	66,562
Purchases	[1]	1,819	7,980
Net Realized Gain (Loss)		(9,031)
Net Change in Unrealized Appreciation (Depreciation)		9,865	4,770
Sales and Settlements	[2]		(40,130)
Net Amortization of Premium/Discount		(80)	1,066
Ending Balance		49,359	40,248
Level 3 | Unsecured Debt
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Beginning Balance		16,790	27,314
Purchases	[1]	109	2,271
Net Realized Gain (Loss)		(1,055)	(2,025)
Net Change in Unrealized Appreciation (Depreciation)		1,553	(18,478)
Sales and Settlements	[2]	(9,366)
Net Amortization of Premium/Discount		250	(338)
Ending Balance		8,281	8,744
Level 3 | Preferred Stock
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Beginning Balance		31,246	37,296
Purchases	[1]	8,698	112
Net Realized Gain (Loss)		(778)
Net Change in Unrealized Appreciation (Depreciation)		2,064	1,082
Ending Balance		41,230	38,490
Level 3 | Common Stock
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Beginning Balance		34,166	30,511
Purchases	[1]	6,393	2,727
Net Realized Gain (Loss)		(20,059)	491
Net Change in Unrealized Appreciation (Depreciation)		12,876	(5,285)
Sales and Settlements	[2]		(4,088)
Ending Balance		33,376	24,356
Level 3 | Warrants
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Beginning Balance		421	244
Net Change in Unrealized Appreciation (Depreciation)		(23)	57
Ending Balance		$ 398	$ 301

[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.