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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 | Sep. 30, 2025 USD ($) | Dec. 31, 2024 USD ($)
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Total Level 3 Debt Investments and Other Assets (Liabilities) |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investments | $ 4,095,669 | $ 3,493,589
Debt investments |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investments | 4,095,558 | 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 | 675,190 | 242,833
Debt investments | Imminent Payoffs |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investments | 71,202 | 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 | 232,737 | 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 | 38,006 | 48,212
Escrow Receivables | Expected Proceeds |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investments | 145 |
Accounts payable and accrued liabilities | Liquidation |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investments | $ (34) | $ (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 | 0.1000 | 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 | 0.4484 | 0.3844
Equity Investments | Market Comparable Companies |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investments | $ 46,346 | $ 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 | 0.1567 | 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 | 16.1 | 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 | 0.9518 | 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 | 7.4 | 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 | 0.2482 | 0.3612
Equity Investments | Market Adjusted OPM Backsolve |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investments | $ 9,934 | $ 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 | (0.8834) | (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 | 0.3835 | 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 | (0.1230) | (0.1757)
Equity Investments | Discounted Cash Flow |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investments | $ 53,173 | $ 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 | 0.1129 | 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 | 0.3419 | 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 | 0.2969 | 0.3021
Equity Investments | Other |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investments | $ 6,119 | $ 5,924
Warrants | Market Comparable Companies |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investments | $ 21,289 | $ 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 | 0.6 | 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 | 0.1565 | 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 | 14.5 | 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 | 0.3310 | 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 | 4.4 | 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 | 0.2643 | 0.2676
Warrants | Market Adjusted OPM Backsolve |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investments | $ 6,059 | $ 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 | (0.6022) | (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 | 0.4676 | 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 | 0.1084 | 0.0133
Warrants | Other |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investments | $ 463 |
Equity and Warrant Investments |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investments | 143,383 | $ 120,218
Pharmaceuticals | Debt investments | Market Comparable Companies |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investments | $ 599,927 | $ 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 | 0.0800 | 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 | 0.1495 | 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 | 0.0200 | 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 | 0.1192 | 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 | 0.0028 | 0.0013
Pharmaceuticals | Debt investments | Liquidation |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investments |  | $ 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 |  | 0.2000
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 |  | 0.8000
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 |  | 0.7553
Technology | Debt investments | Market Comparable Companies |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investments | $ 1,636,736 | $ 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 | 0.1001 | 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 | (0.0150) | (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 | 0.2106 | 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 | 0.0550 | 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 | 0.1262 | 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 | 0.0034 | 0.0020
Technology | Debt investments | Convertible Note Analysis |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investments | $ 29,770 | $ 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 | 0.5107 | 0.5066
Technology | Debt investments | Liquidation |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Investments | $ 47,720 | $ 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 | 0.1500 | 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 | 0.8500 | 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 | 0.7881 | 0.6634
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 | $ 20,359 | $ 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 | 0.1546 | 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 | 0.0100 | 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 | 0.1546 | 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 | 0.0100 | 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 | 0.1546 | 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 | 0.0100 | 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 | $ 74,666 | $ 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 | 0.1192 | 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 | (0.0025) | 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 | 0.1395 | 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 | 0.1310 | 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 | 0.0011 | 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 | $ 669,245 | $ 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 | 0.1002 | 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 | 0.0000 | (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 | 0.1845 | 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 | 0.0400 | 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 | 0.1396 | 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 | 0.0085 | 0.0107

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