Fair Value of Financial Instruments - Fair Value Measurements of Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Equity investments	$ 174,484	$ 188,993
Joint venture investments	26,925
Total investments at fair value	8,653,350	8,108,654
Interest rate swaps	(8,413)	30,932
Total	8,644,937	8,139,586
Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total investments at fair value	199,006	261,207
Interest rate swaps	(8,413)	30,932
Total	190,593	292,139
Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Equity investments	174,484	188,993
Joint venture investments	26,925
Total investments at fair value	8,454,344	7,847,447
Total	8,454,344	7,847,447
First-lien Debt Investments
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Debt investments	8,182,766	7,659,912
First-lien Debt Investments \| Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Debt investments	198,996	260,984
First-lien Debt Investments \| Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Debt investments	7,983,770	7,398,928
Second-lien Debt Investments
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Debt investments	38,581	37,383
Second-lien Debt Investments \| Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Debt investments	10	223
Second-lien Debt Investments \| Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Debt investments	38,571	37,160
Mezzanine Debt Investments
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Debt investments	230,594	222,366
Mezzanine Debt Investments \| Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Debt investments	$ 230,594	$ 222,366