v3.26.1
Fair Value of Financial Instruments - Fair Value of Level 3 Investments at Fair Value and 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 $ 3,175,716 $ 3,181,834
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 $ 2,901,632 $ 2,956,297
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 0.125 0.11
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 $ 23,675 $ 30,456
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 0.153
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 0.162 0.142
Income Approach | Mezzanine Debt Investments | Discount Rate    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair Value $ 64,620 $ 61,684
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 0.087 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 0.20
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 0.117 0.111
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 $ 131,957 $ 133,397
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 0.015 0.018
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 0.114 0.104
Market Multiple | Joint Venture Investments | Comparable Multiple    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair Value $ 53,832