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Fair Value of Financial Instruments - Schedule of Quantitative Information of Fair Value Measurements (Details) - Significant Unobservable Inputs (Level 3) $ in Thousands | Mar. 31, 2025 USD ($) | Dec. 31, 2024 USD ($)
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Total Level Three Debt Investments and Other Investment Receivables (Payables) |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investments | $ 3,740,228 | $ 3,493,589
Debt investments |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investments | 3,739,234 | 3,494,601
Debt investments | Debt Investments originated within 6 months |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investments | 516,515 | 242,833
Debt investments | Imminent Payoffs |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investments | 214,238 | 4,141
Debt investments | Debt Investments Maturing in Less than One Year |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investments | 82,666 | 36,185
Debt investments | Debt Investments in Wholly-Owned Subsidiaries |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investments | 36,790 | 48,212
Escrow and Other Investment Receivables | Expected Proceeds |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investments | 1,966 |
Accounts payable and accrued liabilities | Liquidation |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investments | $ (972) | $ (1,012)
Accounts payable and accrued liabilities | Liquidation | Minimum | Probability weighting of alternative outcomes |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investment company, investment owned, measurement input | 0.2000 | 0.2000
Accounts payable and accrued liabilities | Liquidation | Maximum | Probability weighting of alternative outcomes |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investment company, investment owned, measurement input | 0.5000 | 0.5000
Accounts payable and accrued liabilities | Liquidation | Weighted Average | Probability weighting of alternative outcomes |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investment company, investment owned, measurement input | 0.3979 | 0.3844
Equity and Warrant Investments |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investments | $ 132,141 | $ 120,218
Equity Investments | Market Comparable Companies |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investments | $ 48,390 | $ 45,420
Equity Investments | Market Comparable Companies | Minimum | Revenue Multiple |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investment company, investment owned, measurement input | 0.2 | 0.4
Equity Investments | Market Comparable Companies | Minimum | Tangible Book Value Multiple |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investment company, investment owned, measurement input | 1.6 | 1.7
Equity Investments | Market Comparable Companies | Minimum | Discount for Lack of Marketability |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investment company, investment owned, measurement input | 0.1631 | 0.1764
Equity Investments | Market Comparable Companies | Maximum | Revenue Multiple |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investment company, investment owned, measurement input | 16.5 | 16.8
Equity Investments | Market Comparable Companies | Maximum | Tangible Book Value Multiple |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investment company, investment owned, measurement input | 1.6 | 1.7
Equity Investments | Market Comparable Companies | Maximum | Discount for Lack of Marketability |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investment company, investment owned, measurement input | 0.9253 | 0.9280
Equity Investments | Market Comparable Companies | Weighted Average | Revenue Multiple |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investment company, investment owned, measurement input | 7.0 | 9.1
Equity Investments | Market Comparable Companies | Weighted Average | Tangible Book Value Multiple |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investment company, investment owned, measurement input | 1.6 | 1.7
Equity Investments | Market Comparable Companies | Weighted Average | Discount for Lack of Marketability |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investment company, investment owned, measurement input | 0.3334 | 0.3612
Equity Investments | Market Adjusted OPM Backsolve |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investments | $ 7,237 | $ 12,374
Equity Investments | Market Adjusted OPM Backsolve | Minimum | Market Equity Adjustment |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investment company, investment owned, measurement input | (0.9768) | (0.9657)
Equity Investments | Market Adjusted OPM Backsolve | Maximum | Market Equity Adjustment |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investment company, investment owned, measurement input | (0.0065) | 0.2476
Equity Investments | Market Adjusted OPM Backsolve | Weighted Average | Market Equity Adjustment |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investment company, investment owned, measurement input | (0.3032) | (0.1757)
Equity Investments | Discounted Cash Flow |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investments | $ 50,151 | $ 34,677
Equity Investments | Discounted Cash Flow | Minimum | Discount Rate |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investment company, investment owned, measurement input | 0.1155 | 0.1217
Equity Investments | Discounted Cash Flow | Maximum | Discount Rate |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investment company, investment owned, measurement input | 0.3294 | 0.3334
Equity Investments | Discounted Cash Flow | Weighted Average | Discount Rate |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investment company, investment owned, measurement input | 0.2955 | 0.3021
Equity Investments | Other |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investments | $ 5,778 | $ 5,924
Warrants | Market Comparable Companies |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investments | $ 18,779 | $ 18,302
Warrants | Market Comparable Companies | Minimum | Revenue Multiple |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investment company, investment owned, measurement input | 0.5 | 0.8
Warrants | Market Comparable Companies | Minimum | Discount for Lack of Marketability |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investment company, investment owned, measurement input | 0.0736 | 0.1472
Warrants | Market Comparable Companies | Maximum | Revenue Multiple |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investment company, investment owned, measurement input | 12.9 | 14.1
Warrants | Market Comparable Companies | Maximum | Discount for Lack of Marketability |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investment company, investment owned, measurement input | 0.3240 | 0.3435
Warrants | Market Comparable Companies | Weighted Average | Revenue Multiple |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investment company, investment owned, measurement input | 4.3 | 4.5
Warrants | Market Comparable Companies | Weighted Average | Discount for Lack of Marketability |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investment company, investment owned, measurement input | 0.2428 | 0.2676
Warrants | Market Adjusted OPM Backsolve |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investments | $ 1,806 | $ 3,521
Warrants | Market Adjusted OPM Backsolve | Minimum | Market Equity Adjustment |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investment company, investment owned, measurement input | (0.7008) | (0.5636)
Warrants | Market Adjusted OPM Backsolve | Maximum | Market Equity Adjustment |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investment company, investment owned, measurement input | 0.5433 | 0.2476
Warrants | Market Adjusted OPM Backsolve | Weighted Average | Market Equity Adjustment |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investment company, investment owned, measurement input | (0.0387) | 0.0133
Pharmaceuticals | Debt investments | Market Comparable Companies |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investments | $ 787,506 | $ 947,065
Pharmaceuticals | Debt investments | Market Comparable Companies | Minimum | Hypothetical Market Yield |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investment company, investment owned, measurement input | 0.0878 | 0.0842
Pharmaceuticals | Debt investments | Market Comparable Companies | Minimum | Premium/(Discount) |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investment company, investment owned, measurement input | (0.0250) | (0.0250)
Pharmaceuticals | Debt investments | Market Comparable Companies | Maximum | Hypothetical Market Yield |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investment company, investment owned, measurement input | 0.1634 | 0.1619
Pharmaceuticals | Debt investments | Market Comparable Companies | Maximum | Premium/(Discount) |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investment company, investment owned, measurement input | 0.0300 | 0.0300
Pharmaceuticals | Debt investments | Market Comparable Companies | Weighted Average | Hypothetical Market Yield |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investment company, investment owned, measurement input | 0.1290 | 0.1203
Pharmaceuticals | Debt investments | Market Comparable Companies | Weighted Average | Premium/(Discount) |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investment company, investment owned, measurement input | 0.0017 | 0.0013
Pharmaceuticals | Debt investments | Liquidation |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investments | $ 73,719 | $ 55,344
Pharmaceuticals | Debt investments | Liquidation | Minimum | Probability weighting of alternative outcomes |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investment company, investment owned, measurement input | 0.1000 | 0.2000
Pharmaceuticals | Debt investments | Liquidation | Maximum | Probability weighting of alternative outcomes |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investment company, investment owned, measurement input | 0.9000 | 0.8000
Pharmaceuticals | Debt investments | Liquidation | Weighted Average | Probability weighting of alternative outcomes |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investment company, investment owned, measurement input | 0.8032 | 0.7553
Technology | Debt investments | Market Comparable Companies |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investments | $ 1,281,565 | $ 1,365,943
Technology | Debt investments | Market Comparable Companies | Minimum | Hypothetical Market Yield |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investment company, investment owned, measurement input | 0.0981 | 0.1021
Technology | Debt investments | Market Comparable Companies | Minimum | Premium/(Discount) |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investment company, investment owned, measurement input | (0.0100) | (0.0075)
Technology | Debt investments | Market Comparable Companies | Maximum | Hypothetical Market Yield |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investment company, investment owned, measurement input | 0.2118 | 0.2058
Technology | Debt investments | Market Comparable Companies | Maximum | Premium/(Discount) |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investment company, investment owned, measurement input | 0.0500 | 0.0450
Technology | Debt investments | Market Comparable Companies | Weighted Average | Hypothetical Market Yield |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investment company, investment owned, measurement input | 0.1321 | 0.1310
Technology | Debt investments | Market Comparable Companies | Weighted Average | Premium/(Discount) |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investment company, investment owned, measurement input | 0.0017 | 0.0020
Technology | Debt investments | Liquidation |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investments | $ 53,584 | $ 51,004
Technology | Debt investments | Liquidation | Minimum | Probability weighting of alternative outcomes |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investment company, investment owned, measurement input | 0.1000 | 0.2200
Technology | Debt investments | Liquidation | Maximum | Probability weighting of alternative outcomes |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investment company, investment owned, measurement input | 0.7250 | 0.7800
Technology | Debt investments | Liquidation | Weighted Average | Probability weighting of alternative outcomes |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investment company, investment owned, measurement input | 0.6035 | 0.6634
Technology | Debt investments | Convertible Note Analysis |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investments | $ 27,673 | $ 26,869
Technology | Debt investments | Convertible Note Analysis | Minimum | Probability weighting of alternative outcomes |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investment company, investment owned, measurement input | 0.0100 | 0.0100
Technology | Debt investments | Convertible Note Analysis | Maximum | Probability weighting of alternative outcomes |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investment company, investment owned, measurement input | 0.7000 | 0.7000
Technology | Debt investments | Convertible Note Analysis | Weighted Average | Probability weighting of alternative outcomes |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investment company, investment owned, measurement input | 0.5094 | 0.5066
Sustainable and Renewable Technology | Debt investments | Market Comparable Companies |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investments | $ 19,903 | $ 21,102
Sustainable and Renewable Technology | Debt investments | Market Comparable Companies | Minimum | Hypothetical Market Yield |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investment company, investment owned, measurement input | 0.1578 | 0.1241
Sustainable and Renewable Technology | Debt investments | Market Comparable Companies | Minimum | Premium/(Discount) |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investment company, investment owned, measurement input | 0.0050 | 0.0025
Sustainable and Renewable Technology | Debt investments | Market Comparable Companies | Maximum | Hypothetical Market Yield |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investment company, investment owned, measurement input | 0.1578 | 0.1544
Sustainable and Renewable Technology | Debt investments | Market Comparable Companies | Maximum | Premium/(Discount) |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investment company, investment owned, measurement input | 0.0050 | 0.0350
Sustainable and Renewable Technology | Debt investments | Market Comparable Companies | Weighted Average | Hypothetical Market Yield |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investment company, investment owned, measurement input | 0.1578 | 0.1525
Sustainable and Renewable Technology | Debt investments | Market Comparable Companies | Weighted Average | Premium/(Discount) |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investment company, investment owned, measurement input | 0.0050 | 0.0045
Medical Devices | Debt investments | Market Comparable Companies |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investments | $ 59,851 | $ 59,645
Medical Devices | Debt investments | Market Comparable Companies | Minimum | Hypothetical Market Yield |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investment company, investment owned, measurement input | 0.1181 | 0.1179
Medical Devices | Debt investments | Market Comparable Companies | Minimum | Premium/(Discount) |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investment company, investment owned, measurement input | 0.0000 | 0.0000
Medical Devices | Debt investments | Market Comparable Companies | Maximum | Hypothetical Market Yield |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investment company, investment owned, measurement input | 0.1277 | 0.1275
Medical Devices | Debt investments | Market Comparable Companies | Maximum | Premium/(Discount) |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investment company, investment owned, measurement input | 0.0050 | 0.0050
Medical Devices | Debt investments | Market Comparable Companies | Weighted Average | Hypothetical Market Yield |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investment company, investment owned, measurement input | 0.1226 | 0.1224
Medical Devices | Debt investments | Market Comparable Companies | Weighted Average | Premium/(Discount) |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investment company, investment owned, measurement input | 0.0026 | 0.0026
Lower Middle Market | Debt investments | Market Comparable Companies |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investments | $ 585,224 | $ 636,258
Lower Middle Market | Debt investments | Market Comparable Companies | Minimum | Hypothetical Market Yield |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investment company, investment owned, measurement input | 0.1043 | 0.1027
Lower Middle Market | Debt investments | Market Comparable Companies | Minimum | Premium/(Discount) |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investment company, investment owned, measurement input | (0.0075) | (0.0025)
Lower Middle Market | Debt investments | Market Comparable Companies | Maximum | Hypothetical Market Yield |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investment company, investment owned, measurement input | 0.1748 | 0.2100
Lower Middle Market | Debt investments | Market Comparable Companies | Maximum | Premium/(Discount) |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investment company, investment owned, measurement input | 0.0225 | 0.0500
Lower Middle Market | Debt investments | Market Comparable Companies | Weighted Average | Hypothetical Market Yield |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investment company, investment owned, measurement input | 0.1363 | 0.1412
Lower Middle Market | Debt investments | Market Comparable Companies | Weighted Average | Premium/(Discount) |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investment company, investment owned, measurement input | 0.0058 | 0.0107

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