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Fair Value of Financial Instruments - Summary of Significant Unobservable Inputs Used to Measure The Fair Value Of The Level 3 Portfolio Investments (Details) - Significant Unobservable Inputs (Level 3) $ in Thousands	Mar. 31, 2024 USD ($) yr	Dec. 31, 2023 USD ($) yr
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Total Level 3 Investments	$ 1,344,283	$ 1,268,428
Debt investments | Discounted Cash Flows | Hypothetical Market Yield
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Total Level 3 Investments	$ 984,939	$ 858,870
Debt investments | Discounted Cash Flows | Minimum | Hypothetical Market Yield
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range	0.114	0.116
Debt investments | Discounted Cash Flows | Maximum | Hypothetical Market Yield
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range	0.346	0.346
Debt investments | Discounted Cash Flows | Weighted Average | Hypothetical Market Yield
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range	0.166	0.173
Debt investments | Cost approximates fair value
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Total Level 3 Investments	$ 227,760	$ 253,250
Debt investments | Transactions Precedent | Transaction Price
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Total Level 3 Investments		4,680
Debt investments | Scenario Analysis | Probability Weighting of Alternative Outcomes
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Total Level 3 Investments	$ 66,298	$ 97,573
Debt investments | Scenario Analysis | Minimum | Probability Weighting of Alternative Outcomes
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range	0.02	0.05
Debt investments | Scenario Analysis | Maximum | Probability Weighting of Alternative Outcomes
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range	1	1
Debt investments | Enterprise Value
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Total Level 3 Investments	$ 9,394	$ 7,704
Equity investments | Market Approach | Revenue Multiple
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Total Level 3 Investments	$ 17,325	$ 15,150
Equity investments | Market Approach | Minimum | Revenue Multiple
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range	0.009	0.004
Equity investments | Market Approach | Minimum | Volatility
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range	0.435	0.442
Equity investments | Market Approach | Minimum | Risk-Free Interest Rate
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range	4.3	3
Equity investments | Market Approach | Minimum | Estimated Time to Exit (in years)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range | yr	1	1
Equity investments | Market Approach | Maximum | Revenue Multiple
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range	0.104	0.15
Equity investments | Market Approach | Maximum | Volatility
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range	1.023	1.313
Equity investments | Market Approach | Maximum | Risk-Free Interest Rate
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range	5	4.8
Equity investments | Market Approach | Maximum | Estimated Time to Exit (in years)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range | yr	3.8	4
Equity investments | Market Approach | Weighted Average | Revenue Multiple
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range	0.032	0.037
Equity investments | Market Approach | Weighted Average | Volatility
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range	0.558	0.625
Equity investments | Market Approach | Weighted Average | Risk-Free Interest Rate
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range	3.9	4
Equity investments | Market Approach | Weighted Average | Estimated Time to Exit (in years)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range | yr	2.1	1.7
Warrants | Market Approach | Revenue Multiple
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Total Level 3 Investments	$ 38,567	$ 31,201
Warrants | Market Approach | Minimum | Revenue Multiple
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range	0.003	0.004
Warrants | Market Approach | Minimum | Volatility
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range	0.382	0.333
Warrants | Market Approach | Minimum | Risk-Free Interest Rate
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range	0.04	0.029
Warrants | Market Approach | Minimum | Estimated Time to Exit (in years)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range | yr	0.7	1
Warrants | Market Approach | Maximum | Revenue Multiple
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range	0.104	0.15
Warrants | Market Approach | Maximum | Volatility
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range	1.195	1.313
Warrants | Market Approach | Maximum | Risk-Free Interest Rate
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range	0.052	0.048
Warrants | Market Approach | Maximum | Estimated Time to Exit (in years)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range | yr	4.6	4.8
Warrants | Market Approach | Weighted Average | Revenue Multiple
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range	0.028	0.027
Warrants | Market Approach | Weighted Average | Volatility
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range	0.642	0.688
Warrants | Market Approach | Weighted Average | Risk-Free Interest Rate
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range	0.046	0.043
Warrants | Market Approach | Weighted Average | Estimated Time to Exit (in years)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Range | yr	2.2	2.2

X

- Definition

Value of input used to measure investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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