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	Jun. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Fair Value	$ 44,722	$ 53,134
Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Fair Value	1,525,592	1,470,147
Level 3 | Senior Secured First Lien
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Fair Value	432,906	409,945
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	$ 366,748	$ 337,406
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	10.1	10.4
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	37.1	19.3
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	12	12
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	$ 31,075	$ 30,299
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	3.7	0.9
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	16.6	11.3
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	8.4	6.5
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	$ 29,525	$ 33,811
Level 3 | Senior Secured First Lien | Collateral Analysis
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Fair Value		$ 176
Level 3 | Senior Secured First Lien | Collateral Analysis | Recovery Rate | Maximum
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range		1.3
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	$ 5,558	$ 8,253
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	21.2	15.5
Level 3 | Unitranche First Lien
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Fair Value	$ 980,266	$ 948,781
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	$ 928,862	$ 898,108
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	9.7	9.1
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	18.9	18.6
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	11.6	11.8
Level 3 | Unitranche First Lien | Enterprise Value
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Fair Value	$ 4,646	$ 4,248
Level 3 | Unitranche First Lien | Enterprise Value | Revenue Growth Rate | Maximum
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range	0.5	0.6
Level 3 | Unitranche First Lien | Broker Quoted
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Fair Value	$ 46,758	$ 46,425
Level 3 | Unitranche First Lien Last Out
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Fair Value	5,604	13,544
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	$ 5,604	$ 12,490
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	12.4	10.1
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	15.7	17.4
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	14.8	12.8
Level 3 | Unitranche First Lien Last Out | Collateral Analysis
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Fair Value		$ 1,054
Level 3 | Unitranche First Lien Last Out | Collateral Analysis | Recovery Rate
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range		20.7
Level 3 | Senior Secured Second Lien
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Fair Value	$ 35,208	$ 44,907
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	$ 23,560	$ 32,051
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	11.5	13.2
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	13.9	14.6
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	12.5	13.7
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	$ 6,673	$ 7,878
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	3.9	3.4
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	9.3	8.9
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	5.6	5.9
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	$ 4,975	$ 4,978
Level 3 | Unsecured Debt
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Fair Value	15,633	4,061
Level 3 | Unsecured Debt | Discounted Cash Flows
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Fair Value	$ 14,112	$ 3,235
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	12.1	14.4
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	14.5	18.1
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	14.1	15.9
Level 3 | Unsecured Debt | Enterprise Value
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Fair Value	$ 1,521	$ 826
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	11.9	11.3
Level 3 | Equity & Other
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Fair Value	$ 55,975	$ 48,909
Level 3 | Equity & Other | Discounted Cash Flows
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Fair Value	$ 856	$ 435
Level 3 | Equity & Other | Discounted Cash Flows | Discount Rate | Maximum
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range	19.4	18.2
Level 3 | Equity & Other | Enterprise Value
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Fair Value	$ 55,119	$ 48,474
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	0.5	1.8
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	28.2	28.4
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	16.3	16.4