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	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Fair Value	$ 53,134	$ 13,760
Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Fair Value	1,470,147	1,167,987
Level 3 | Senior Secured First Lien
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Fair Value	409,945	277,786
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	$ 337,406	$ 201,043
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	10.4	9.4
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	19.3	19.4
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	10.9
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	$ 30,299	$ 13,593
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	0.9	8.3
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	11.3	14.8
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	(6.5)	9.1
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	$ 46,425	$ 63,150
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
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	$ 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	15.5
Level 3 | Unitranche First Lien
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Fair Value	$ 948,781	771,348
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	$ 898,108	$ 620,221
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	9.1	6.8
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	18.6	15.7
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	11.8	10.8
Level 3 | Unitranche First Lien | Enterprise Value
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Fair Value	$ 4,248	$ 15,576
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		13.1
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		6.8
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		11.5
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	0.6
Level 3 | Unitranche First Lien | Broker Quoted
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Fair Value	$ 33,811	$ 135,551
Level 3 | Unitranche First Lien Last Out
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Fair Value	13,544	13,827
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	$ 12,490	$ 11,642
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	10.1	8.4
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	17.4	16.5
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	12.8	10.9
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	$ 2,185
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	42.9
Level 3 | Senior Secured Second Lien
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Fair Value	$ 44,907	$ 56,586
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	$ 32,051	$ 29,749
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	13.2	11.5
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	14.6	26
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	13.7	15.6
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	$ 7,878	$ 7,397
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	3.4	8.3
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	8.9	14.8
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	(5.9)	10.8
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	$ 4,978	$ 19,440
Level 3 | Unsecured Debt
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Fair Value	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	$ 3,235	$ 4,533
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	14.4	15.2
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	18.1	17.3
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	15.9	16.1
Level 3 | Unsecured Debt | Enterprise Value
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Fair Value	$ 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	11.3
Level 3 | Equity & Other
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Fair Value	$ 48,909	$ 43,907
Level 3 | Equity & Other | Discounted Cash Flows
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Fair Value	$ 435	$ 200
Level 3 | Equity & Other | Discounted Cash Flows | Discount Rate | Minimum
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range		22.1
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	18.2	22.1
Level 3 | Equity & Other | Discounted Cash Flows | Discount Rate | Weighted Average
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range		22.1
Level 3 | Equity & Other | Enterprise Value
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Fair Value	$ 48,474	$ 43,311
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	1.8	10.9
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	28.4	27.8
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	16.4	15.7
Level 3 | Equity & Other | Broker Quoted
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Fair Value		$ 396