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Fair Value of Financial Instruments - Summary of Fair Value of Level 3 Investments and Ranges of Significant Unobservable Inputs Used to Value Level 3 Investments (Details)
$ in Thousands
Sep. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair Value $ 38,980 $ 39,426
Level 3    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair Value 1,535,261 1,513,914
Level 3 | Senior Secured First Lien    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair Value 352,812 379,628
Level 3 | Senior Secured First Lien | Discounted Cash Flows    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair Value $ 307,454 $ 324,549
Level 3 | Senior Secured First Lien | Discounted Cash Flows | Discount Rate | Minimum    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Range 6.1 8
Level 3 | Senior Secured First Lien | Discounted Cash Flows | Discount Rate | Maximum    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Range 17.6 18.3
Level 3 | Senior Secured First Lien | Discounted Cash Flows | Discount Rate | Weighted Average    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Range 10 10.8
Level 3 | Senior Secured First Lien | Enterprise Value    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair Value $ 29,406 $ 27,840
Level 3 | Senior Secured First Lien | Enterprise Value | Comparable EBITDA Multiple | Minimum    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Range 2.9 3.1
Level 3 | Senior Secured First Lien | Enterprise Value | Comparable EBITDA Multiple | Maximum    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Range 12.4 10.6
Level 3 | Senior Secured First Lien | Enterprise Value | Comparable EBITDA Multiple | Weighted Average    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Range 9.4 8.1
Level 3 | Senior Secured First Lien | Transactions Precedent    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair Value $ 10,939  
Level 3 | Senior Secured First Lien | Broker Quoted    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair Value 5,013 $ 24,460
Level 3 | Senior Secured First Lien | Discounted Cash Flows    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair Value   $ 2,779
Level 3 | Senior Secured First Lien | Discounted Cash Flows | Royalty Payment Discount Rate | Maximum    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Range   22.4
Level 3 | Unitranche First Lien    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair Value 1,034,035 $ 1,013,934
Level 3 | Unitranche First Lien | Discounted Cash Flows    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair Value $ 896,351 $ 988,714
Level 3 | Unitranche First Lien | Discounted Cash Flows | Discount Rate | Minimum    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Range 7.6 8.9
Level 3 | Unitranche First Lien | Discounted Cash Flows | Discount Rate | Maximum    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Range 19.7 18.3
Level 3 | Unitranche First Lien | Discounted Cash Flows | Discount Rate | Weighted Average    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Range 9.9 10.7
Level 3 | Unitranche First Lien | Enterprise Value    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair Value $ 40,041 $ 12,556
Level 3 | Unitranche First Lien | Enterprise Value | Comparable EBITDA Multiple | Minimum    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Range 7  
Level 3 | Unitranche First Lien | Enterprise Value | Comparable EBITDA Multiple | Maximum    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Range 13.7 10.9
Level 3 | Unitranche First Lien | Enterprise Value | Comparable EBITDA Multiple | Weighted Average    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Range 9.7  
Level 3 | Unitranche First Lien | Transactions Precedent    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair Value $ 37,863  
Level 3 | Unitranche First Lien | Broker Quoted    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair Value 59,780 $ 12,664
Level 3 | Unitranche First Lien Last Out    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair Value 26,170 14,741
Level 3 | Unitranche First Lien Last Out | Discounted Cash Flows    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair Value $ 18,670 $ 14,741
Level 3 | Unitranche First Lien Last Out | Discounted Cash Flows | Discount Rate | Minimum    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Range 7.5 11.2
Level 3 | Unitranche First Lien Last Out | Discounted Cash Flows | Discount Rate | Maximum    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Range 16.8 16
Level 3 | Unitranche First Lien Last Out | Discounted Cash Flows | Discount Rate | Weighted Average    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Range 11.5 12.8
Level 3 | Unitranche First Lien Last Out | Enterprise Value    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair Value $ 7,500  
Level 3 | Unitranche First Lien Last Out | Enterprise Value | Comparable EBITDA Multiple | Maximum    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Range 7.8  
Level 3 | Senior Secured Second Lien    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair Value $ 18,647 $ 24,351
Level 3 | Senior Secured Second Lien | Discounted Cash Flows    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair Value $ 15,010 $ 15,802
Level 3 | Senior Secured Second Lien | Discounted Cash Flows | Discount Rate | Minimum    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Range 10.9 12.4
Level 3 | Senior Secured Second Lien | Discounted Cash Flows | Discount Rate | Maximum    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Range 12.8 14.1
Level 3 | Senior Secured Second Lien | Discounted Cash Flows | Discount Rate | Weighted Average    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Range 11.9 12.9
Level 3 | Senior Secured Second Lien | Enterprise Value    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair Value $ 3,637 $ 3,549
Level 3 | Senior Secured Second Lien | Enterprise Value | Comparable EBITDA Multiple | Minimum    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Range   1.4
Level 3 | Senior Secured Second Lien | Enterprise Value | Comparable EBITDA Multiple | Maximum    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Range 3.4 10.1
Level 3 | Senior Secured Second Lien | Enterprise Value | Comparable EBITDA Multiple | Weighted Average    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Range   5.1
Level 3 | Senior Secured Second Lien | Broker Quoted    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair Value   $ 5,000
Level 3 | Unsecured Debt    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair Value $ 19,531 17,525
Level 3 | Unsecured Debt | Discounted Cash Flows    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair Value $ 17,505 $ 15,706
Level 3 | Unsecured Debt | Discounted Cash Flows | Discount Rate | Minimum    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Range 11 13.3
Level 3 | Unsecured Debt | Discounted Cash Flows | Discount Rate | Maximum    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Range 15.5 17.2
Level 3 | Unsecured Debt | Discounted Cash Flows | Discount Rate | Weighted Average    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Range 13.7 14.2
Level 3 | Unsecured Debt | Enterprise Value    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair Value $ 2,026 $ 1,819
Level 3 | Unsecured Debt | Enterprise Value | Comparable EBITDA Multiple | Maximum    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Range 12.4 10.6
Level 3 | Equity & Other    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair Value $ 84,066 $ 63,735
Level 3 | Equity & Other | Enterprise Value    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair Value $ 82,719 $ 63,735
Level 3 | Equity & Other | Enterprise Value | Comparable EBITDA Multiple | Minimum    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Range 2.9 3.1
Level 3 | Equity & Other | Enterprise Value | Comparable EBITDA Multiple | Maximum    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Range 28 27.4
Level 3 | Equity & Other | Enterprise Value | Comparable EBITDA Multiple | Weighted Average    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Range 14.5 15.3
Level 3 | Equity & Other | Transactions Precedent    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair Value $ 1,272  
Level 3 | Equity & Other | Broker Quoted    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair Value $ 75