Quarterly report [Sections 13 or 15(d)]

Fair Value of Financial Instruments - Schedule of Quantitative Information of Fair Value Measurements (Details)

v3.26.1
Fair Value of Financial Instruments - Schedule of Quantitative Information of Fair Value Measurements (Details)
$ in Thousands
Mar. 31, 2026
USD ($)
Dec. 31, 2025
USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investments $ 4,714,760 $ 4,459,584
Warrants    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investments 42,507 41,162
Significant Unobservable Inputs (Level 3)    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investments 4,683,554 4,424,928
Significant Unobservable Inputs (Level 3) | 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 4,540,173 4,279,493
Significant Unobservable Inputs (Level 3) | Debt investments    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investments 4,540,145 4,279,412
Significant Unobservable Inputs (Level 3) | Debt investments | Debt Investments originated within 6 months    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investments 479,165 403,710
Significant Unobservable Inputs (Level 3) | Debt investments | Imminent Payoffs    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investments 348,464 7,711
Significant Unobservable Inputs (Level 3) | 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 206,075 248,601
Significant Unobservable Inputs (Level 3) | Debt investments | Debt Investments in Wholly-Owned Subsidiaries    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investments 41,291 38,255
Significant Unobservable Inputs (Level 3) | Escrow Receivables | Expected Proceeds    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investments 114 168
Significant Unobservable Inputs (Level 3) | Accounts payable and accrued liabilities | Liquidation    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investments $ (86) $ (87)
Significant Unobservable Inputs (Level 3) | 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 0.1000
Significant Unobservable Inputs (Level 3) | 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
Significant Unobservable Inputs (Level 3) | 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 0.4484
Significant Unobservable Inputs (Level 3) | Equity Investments | Market Comparable Companies    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investments $ 46,476 $ 48,874
Significant Unobservable Inputs (Level 3) | 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 0.1 0.1
Significant Unobservable Inputs (Level 3) | 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
Significant Unobservable Inputs (Level 3) | 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 0.1480 0.0944
Significant Unobservable Inputs (Level 3) | 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 9.2 12.3
Significant Unobservable Inputs (Level 3) | 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
Significant Unobservable Inputs (Level 3) | 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 0.9185 0.9230
Significant Unobservable Inputs (Level 3) | 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 3.1 4.5
Significant Unobservable Inputs (Level 3) | 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
Significant Unobservable Inputs (Level 3) | 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 0.2783 0.2625
Significant Unobservable Inputs (Level 3) | Equity Investments | Market Adjusted OPM Backsolve    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investments $ 12,236 $ 7,702
Significant Unobservable Inputs (Level 3) | 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 (0.9201) (0.8931)
Significant Unobservable Inputs (Level 3) | 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 0.0135 0.7057
Significant Unobservable Inputs (Level 3) | 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 (0.2288) (0.0713)
Significant Unobservable Inputs (Level 3) | Equity Investments | Discounted Cash Flow    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investments $ 46,127 $ 51,250
Significant Unobservable Inputs (Level 3) | 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 0.1114
Significant Unobservable Inputs (Level 3) | 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 0.3531 0.3318
Significant Unobservable Inputs (Level 3) | 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 0.3299 0.3009
Significant Unobservable Inputs (Level 3) | Equity Investments | Other    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investments $ 7,694 $ 9,629
Significant Unobservable Inputs (Level 3) | Warrants    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investments 30,876 28,061
Significant Unobservable Inputs (Level 3) | Warrants | Market Comparable Companies    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investments $ 17,501 $ 19,318
Significant Unobservable Inputs (Level 3) | 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 0.3
Significant Unobservable Inputs (Level 3) | 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 0.1480 0.1328
Significant Unobservable Inputs (Level 3) | 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 12.7 13.0
Significant Unobservable Inputs (Level 3) | 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 0.3570 0.3640
Significant Unobservable Inputs (Level 3) | 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 3.7 5.5
Significant Unobservable Inputs (Level 3) | 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 0.2515 0.2690
Significant Unobservable Inputs (Level 3) | Warrants | Market Adjusted OPM Backsolve    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investments $ 11,967 $ 8,283
Significant Unobservable Inputs (Level 3) | 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 (0.6594) (0.6090)
Significant Unobservable Inputs (Level 3) | 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 1.0293 0.8740
Significant Unobservable Inputs (Level 3) | 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 0.1843 0.2666
Significant Unobservable Inputs (Level 3) | Warrants | Other    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investments $ 1,408 $ 460
Significant Unobservable Inputs (Level 3) | Equity and Warrant Investments    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investments 143,409 145,516
Pharmaceuticals | Significant Unobservable Inputs (Level 3) | Debt investments | Market Comparable Companies    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investments $ 721,599 $ 777,671
Pharmaceuticals | Significant Unobservable Inputs (Level 3) | 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 0.0940 0.0901
Pharmaceuticals | Significant Unobservable Inputs (Level 3) | 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 (0.0200) (0.0250)
Pharmaceuticals | Significant Unobservable Inputs (Level 3) | 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 0.1706 0.1539
Pharmaceuticals | Significant Unobservable Inputs (Level 3) | 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 0.0200
Pharmaceuticals | Significant Unobservable Inputs (Level 3) | 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 0.1190 0.1197
Pharmaceuticals | Significant Unobservable Inputs (Level 3) | 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 (0.0081) (0.0034)
Technology | Significant Unobservable Inputs (Level 3) | Debt investments | Market Comparable Companies    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investments $ 1,719,485 $ 1,779,826
Technology | Significant Unobservable Inputs (Level 3) | 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 0.0939 0.0958
Technology | Significant Unobservable Inputs (Level 3) | 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 (0.0275) (0.0150)
Technology | Significant Unobservable Inputs (Level 3) | 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 0.1884 0.1746
Technology | Significant Unobservable Inputs (Level 3) | 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 0.0600 0.0450
Technology | Significant Unobservable Inputs (Level 3) | 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 0.1296 0.1230
Technology | Significant Unobservable Inputs (Level 3) | 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 0.0004 0.0022
Technology | Significant Unobservable Inputs (Level 3) | Debt investments | Convertible Note Analysis    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investments $ 29,462 $ 30,986
Technology | Significant Unobservable Inputs (Level 3) | 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 0.0500 0.0100
Technology | Significant Unobservable Inputs (Level 3) | 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 0.9500 0.7000
Technology | Significant Unobservable Inputs (Level 3) | 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 0.9046 0.5123
Technology | Significant Unobservable Inputs (Level 3) | Debt investments | Liquidation    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investments $ 24,889 $ 73,268
Technology | Significant Unobservable Inputs (Level 3) | 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 0.0500 0.1000
Technology | Significant Unobservable Inputs (Level 3) | 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 0.9500 0.9000
Technology | Significant Unobservable Inputs (Level 3) | 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 0.6159 0.7629
Sustainable and Renewable Technology | Significant Unobservable Inputs (Level 3) | Debt investments | Market Comparable Companies    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investments   $ 30,201
Sustainable and Renewable Technology | Significant Unobservable Inputs (Level 3) | 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   0.1589
Sustainable and Renewable Technology | Significant Unobservable Inputs (Level 3) | 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
Sustainable and Renewable Technology | Significant Unobservable Inputs (Level 3) | 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   0.1625
Sustainable and Renewable Technology | Significant Unobservable Inputs (Level 3) | 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   0.0075
Sustainable and Renewable Technology | Significant Unobservable Inputs (Level 3) | 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   0.1604
Sustainable and Renewable Technology | Significant Unobservable Inputs (Level 3) | 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   0.0075
Medical Devices | Significant Unobservable Inputs (Level 3) | Debt investments | Market Comparable Companies    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investments $ 74,905 $ 74,771
Medical Devices | Significant Unobservable Inputs (Level 3) | 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 0.1245 0.1218
Medical Devices | Significant Unobservable Inputs (Level 3) | 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) (0.0025)
Medical Devices | Significant Unobservable Inputs (Level 3) | 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 0.1398 0.1421
Medical Devices | Significant Unobservable Inputs (Level 3) | 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 | Significant Unobservable Inputs (Level 3) | 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 0.1342 0.1336
Medical Devices | Significant Unobservable Inputs (Level 3) | 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 0.0011
Lower Middle Market | Significant Unobservable Inputs (Level 3) | Debt investments | Market Comparable Companies    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investments $ 894,810 $ 814,412
Lower Middle Market | Significant Unobservable Inputs (Level 3) | 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 0.1089 0.1030
Lower Middle Market | Significant Unobservable Inputs (Level 3) | 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) (0.0050)
Lower Middle Market | Significant Unobservable Inputs (Level 3) | 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 0.2007 0.1873
Lower Middle Market | Significant Unobservable Inputs (Level 3) | 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 0.0450 0.0400
Lower Middle Market | Significant Unobservable Inputs (Level 3) | 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 0.1391 0.1360
Lower Middle Market | Significant Unobservable Inputs (Level 3) | 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 0.0021 0.0060