v3.26.1
Fair Value Measurement - Summary of Significant Unobservable Inputs of the Company's Level 3 Financial Instruments (Detail) - Fair Value, Inputs, Level 3 [Member] - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2026
Dec. 31, 2025
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 3,726,693 $ 2,958,691
First Lien Senior Secured Debt [Member] | Recovery Rate [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Unobservable Input Recovery Rate  
Subordinated Notes [Member] | Annual Prepayment Rate [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Unobservable Input Annual Prepayment Rate Annual Prepayment Rate
Range 20.00 20.00
Subordinated Notes [Member] | Annual Prepayment Rate [Member] | Weighted Average [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Weighted Average [1] 20.00 20.00
Subordinated Notes [Member] | Reinvestment Spread [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Unobservable Input Reinvestment Spread Reinvestment Spread
Subordinated Notes [Member] | Reinvestment Spread [Member] | Minimum [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Range 3.45 3.20
Subordinated Notes [Member] | Reinvestment Spread [Member] | Maximum [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Range 5.00 5.05
Subordinated Notes [Member] | Reinvestment Spread [Member] | Weighted Average [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Weighted Average [1] 4.39 4.18
Subordinated Notes [Member] | Reinvestment Price [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Unobservable Input Reinvestment Price Reinvestment Price
Subordinated Notes [Member] | Reinvestment Price [Member] | Minimum [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Range 99.50 99.00
Subordinated Notes [Member] | Reinvestment Price [Member] | Maximum [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Range   99.50
Subordinated Notes [Member] | Reinvestment Price [Member] | Weighted Average [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Weighted Average [1] 99.50 99.23
Subordinated Notes [Member] | Recovery Rate [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Unobservable Input Recovery Rate Recovery Rate
Range   65.00
Subordinated Notes [Member] | Recovery Rate [Member] | Minimum [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Range 64.57  
Subordinated Notes [Member] | Recovery Rate [Member] | Maximum [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Range 70.20  
Subordinated Notes [Member] | Recovery Rate [Member] | Weighted Average [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Weighted Average [1] 66.64 65.00
Subordinated Notes [Member] | Expected Yield [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Unobservable Input Expected Yield Expected Yield
Subordinated Notes [Member] | Expected Yield [Member] | Minimum [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Range 12.08 11.00
Subordinated Notes [Member] | Expected Yield [Member] | Maximum [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Range 19.75 20.50
Subordinated Notes [Member] | Expected Yield [Member] | Weighted Average [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Weighted Average [1] 15.05 15.98%
Yield Method [Member] | First Lien Senior Secured Debt [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 3,332,144 $ 2,797,561
Unobservable Input Market Yield Discount Spreads Market Yield Discount Spreads
Yield Method [Member] | First Lien Senior Secured Debt [Member] | Minimum [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Range 3.45 3.37
Yield Method [Member] | First Lien Senior Secured Debt [Member] | Maximum [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Range 24.20 27.84
Yield Method [Member] | First Lien Senior Secured Debt [Member] | Weighted Average [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Weighted Average [1] 6.37 5.77
Yield Method [Member] | Second Lien Senior Secured [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value   $ 5,460
Unobservable Input   Market Yield Discount Spreads
Yield Method [Member] | Second Lien Senior Secured [Member] | Minimum [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Range   5.18
Yield Method [Member] | Second Lien Senior Secured [Member] | Maximum [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Range   6.18
Yield Method [Member] | Second Lien Senior Secured [Member] | Weighted Average [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Weighted Average [1]   5.68
Yield Method [Member] | Subordinated Notes [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 6,155 $ 16,580
Unobservable Input Market Yield Discount Spreads Market Yield Discount Spreads
Range   15.00
Yield Method [Member] | Subordinated Notes [Member] | Minimum [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Range 13.00  
Yield Method [Member] | Subordinated Notes [Member] | Maximum [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Range 14.00  
Yield Method [Member] | Subordinated Notes [Member] | Weighted Average [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Weighted Average [1] 13.52 15.00
Recent Transaction [Member] | First Lien Senior Secured Debt [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 330,231 $ 102,299
Unobservable Input Transaction Price Transaction Price
Recent Transaction [Member] | First Lien Senior Secured Debt [Member] | Minimum [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Range 96.88 98.00
Recent Transaction [Member] | First Lien Senior Secured Debt [Member] | Maximum [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Range 100.00 100.00
Recent Transaction [Member] | First Lien Senior Secured Debt [Member] | Weighted Average [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Weighted Average [1] 98.92 98.93
MarketApproach [Member] | First Lien Senior Secured Debt [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 4,669 $ 3,554
Unobservable Input Market Multiple Market Multiple
MarketApproach [Member] | First Lien Senior Secured Debt [Member] | Minimum [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Range 0.4x 0.3
MarketApproach [Member] | First Lien Senior Secured Debt [Member] | Maximum [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Range 28.3x 10.9
MarketApproach [Member] | First Lien Senior Secured Debt [Member] | Weighted Average [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Weighted Average [1] 10.8x 5.6
MarketApproach [Member] | Preferred Equity [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value   $ 499
Unobservable Input   Market Multiple
MarketApproach [Member] | Preferred Equity [Member] | Minimum [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Range   0.3
MarketApproach [Member] | Preferred Equity [Member] | Maximum [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Range   10.9
MarketApproach [Member] | Preferred Equity [Member] | Weighted Average [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Weighted Average [1]   5.6
Discounted Cash Flows [Member] | Subordinated Notes [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 51,768 $ 32,738
Unobservable Input Annual Default Rate Annual Default Rate
Discounted Cash Flows [Member] | Subordinated Notes [Member] | Minimum [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Range 1.76 2.00
Discounted Cash Flows [Member] | Subordinated Notes [Member] | Maximum [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Range 2.94 3.00
Discounted Cash Flows [Member] | Subordinated Notes [Member] | Weighted Average [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Range [1] 1.99 2.54
Liquidation Analysis | First Lien Senior Secured Debt [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 1,726  
Liquidation Analysis | First Lien Senior Secured Debt [Member] | Minimum [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Range 8.10  
Liquidation Analysis | First Lien Senior Secured Debt [Member] | Maximum [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Range 83.45  
Liquidation Analysis | First Lien Senior Secured Debt [Member] | Weighted Average [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Weighted Average [1] 39.29  
Liquidation Analysis | Subordinated Notes [Member] | Residual Equity Values    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Unobservable Input Residual Equity Values  
Range —  
Liquidation Analysis | Subordinated Notes [Member] | Residual Equity Values | Weighted Average [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Weighted Average [1] —%  
[1] Weighted average is calculated by weighing the significant unobservable input by the relative fair value of each investment in the category.