v3.26.1
Fair Value of Financial Instruments - Fair Value of Level 3 Investments at Fair Value Significant Unobservable Inputs Used in Valuations (Details) - Level 3
$ in Thousands
Jun. 30, 2026
USD ($)
Dec. 31, 2025
USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair Value $ 8,454,344 $ 7,847,447
Income Approach | First-lien Debt Investments | Discount Rate    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair Value $ 7,983,770 $ 7,398,928
Income Approach | First-lien Debt Investments | Discount Rate | Minimum    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investment measurement input 0.076 0.066
Income Approach | First-lien Debt Investments | Discount Rate | Maximum    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investment measurement input 0.275 0.175
Income Approach | First-lien Debt Investments | Discount Rate | Weighted Average    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investment measurement input 0.109 0.098
Income Approach | Second-lien Debt Investments | Discount Rate    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair Value $ 38,571 $ 37,160
Income Approach | Second-lien Debt Investments | Discount Rate | Minimum    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investment measurement input 0.162 0.125
Income Approach | Second-lien Debt Investments | Discount Rate | Maximum    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investment measurement input 0.165 0.141
Income Approach | Second-lien Debt Investments | Discount Rate | Weighted Average    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investment measurement input 0.163 0.136
Income Approach | Mezzanine Debt Investments | Discount Rate    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair Value $ 230,594 $ 222,366
Income Approach | Mezzanine Debt Investments | Discount Rate | Minimum    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investment measurement input 0.119 0.108
Income Approach | Mezzanine Debt Investments | Discount Rate | Maximum    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investment measurement input 0.119 0.108
Income Approach | Mezzanine Debt Investments | Discount Rate | Weighted Average    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investment measurement input 0.119 0.108
Income Approach | Joint Venture Investments | Discount Rate    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair Value $ 26,925  
Income Approach | Joint Venture Investments | Discount Rate | Minimum    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investment measurement input 0.125  
Income Approach | Joint Venture Investments | Discount Rate | Maximum    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investment measurement input 0.125  
Income Approach | Joint Venture Investments | Discount Rate | Weighted Average    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investment measurement input 0.125  
Market Multiple | Equity Investments | Comparable Multiple    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair Value $ 174,484 $ 188,993
Market Multiple | Equity Investments | Comparable Multiple | Minimum    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investment measurement input 0.104 0.028
Market Multiple | Equity Investments | Comparable Multiple | Maximum    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investment measurement input 0.22 0.25
Market Multiple | Equity Investments | Comparable Multiple | Weighted Average    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investment measurement input 0.146 0.135