v3.26.1
Fair Value of Financial Instruments - Fair Value of Level 3 Investments at Fair Value Significant Unobservable Inputs Used in Valuations (Parenthetical) (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
First-lien Debt Investments    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt investments $ 8,182,766 $ 7,659,912
First-lien Debt Investments | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt investments 7,983,770 7,398,928
Asset Valuation Waterfall | First-lien Debt Investments | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt investments 43,100 50,800
Comparable Market Price | First-lien Debt Investments | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt investments 37,600 60,900
Cost Model | Equity Investments | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Equity investment 75,700 $ 81,400
Cost Model | Joint Venture Investments | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Joint venture investments $ 26,900