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Investments - Schedule of Fair Value Portfolio by Industry Sector (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2025 | Dec. 31, 2024
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | $ 3,924,450 | $ 3,659,978
Industry Sector Concentration Risk | Total Industry Sectors |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 3,924,450 | 3,659,978
Industry Sector Concentration Risk | Software |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 1,262,813 | 1,081,100
Industry Sector Concentration Risk | Drug Discovery & Development |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 1,119,941 | 1,080,390
Industry Sector Concentration Risk | Healthcare Services, Other |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 625,556 | 610,184
Industry Sector Concentration Risk | Consumer & Business Services |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 374,561 | 372,641
Industry Sector Concentration Risk | Electronics & Computer Hardware |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 167,370 | 162,888
Industry Sector Concentration Risk | Diversified Financial Services |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 117,366 | 113,491
Industry Sector Concentration Risk | Medical Devices & Equipment |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 75,238 | 74,962
Industry Sector Concentration Risk | Space Technologies |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 49,527 | 45,700
Industry Sector Concentration Risk | Biotechnology Tools |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 34,819 | 35,434
Industry Sector Concentration Risk | Communications & Networking |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 27,601 | 27,700
Industry Sector Concentration Risk | Information Services |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 24,923 | 24,356
Industry Sector Concentration Risk | Sustainable and Renewable Technology |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 22,396 | 27,696
Industry Sector Concentration Risk | Manufacturing Technology |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 20,653 | 1,162
Industry Sector Concentration Risk | Consumer & Business Products |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 1,139 | 1,497
Industry Sector Concentration Risk | Semiconductors |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 425 | 704
Industry Sector Concentration Risk | Media/Content/Info |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 114 | 63
Industry Sector Concentration Risk | Drug Delivery |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | $ 8 | $ 10
Industry Sector Concentration Risk | Industry Sector Investments Benchmark | Total Industry Sectors |  |
Schedule Of Investments [Line Items] |  |
Percentage of Total Portfolio | 100.00% | 100.00%
Industry Sector Concentration Risk | Industry Sector Investments Benchmark | Software |  |
Schedule Of Investments [Line Items] |  |
Percentage of Total Portfolio | 32.20% | 29.50%
Industry Sector Concentration Risk | Industry Sector Investments Benchmark | Drug Discovery & Development |  |
Schedule Of Investments [Line Items] |  |
Percentage of Total Portfolio | 28.50% | 29.50%
Industry Sector Concentration Risk | Industry Sector Investments Benchmark | Healthcare Services, Other |  |
Schedule Of Investments [Line Items] |  |
Percentage of Total Portfolio | 15.90% | 16.70%
Industry Sector Concentration Risk | Industry Sector Investments Benchmark | Consumer & Business Services |  |
Schedule Of Investments [Line Items] |  |
Percentage of Total Portfolio | 9.60% | 10.20%
Industry Sector Concentration Risk | Industry Sector Investments Benchmark | Electronics & Computer Hardware |  |
Schedule Of Investments [Line Items] |  |
Percentage of Total Portfolio | 4.30% | 4.50%
Industry Sector Concentration Risk | Industry Sector Investments Benchmark | Diversified Financial Services |  |
Schedule Of Investments [Line Items] |  |
Percentage of Total Portfolio | 3.00% | 3.10%
Industry Sector Concentration Risk | Industry Sector Investments Benchmark | Medical Devices & Equipment |  |
Schedule Of Investments [Line Items] |  |
Percentage of Total Portfolio | 1.90% | 2.00%
Industry Sector Concentration Risk | Industry Sector Investments Benchmark | Space Technologies |  |
Schedule Of Investments [Line Items] |  |
Percentage of Total Portfolio | 1.30% | 1.20%
Industry Sector Concentration Risk | Industry Sector Investments Benchmark | Biotechnology Tools |  |
Schedule Of Investments [Line Items] |  |
Percentage of Total Portfolio | 0.90% | 1.00%
Industry Sector Concentration Risk | Industry Sector Investments Benchmark | Communications & Networking |  |
Schedule Of Investments [Line Items] |  |
Percentage of Total Portfolio | 0.70% | 0.80%
Industry Sector Concentration Risk | Industry Sector Investments Benchmark | Information Services |  |
Schedule Of Investments [Line Items] |  |
Percentage of Total Portfolio | 0.60% | 0.70%
Industry Sector Concentration Risk | Industry Sector Investments Benchmark | Sustainable and Renewable Technology |  |
Schedule Of Investments [Line Items] |  |
Percentage of Total Portfolio | 0.60% | 0.80%
Industry Sector Concentration Risk | Industry Sector Investments Benchmark | Manufacturing Technology |  |
Schedule Of Investments [Line Items] |  |
Percentage of Total Portfolio | 0.50% | 0.00%
Industry Sector Concentration Risk | Industry Sector Investments Benchmark | Consumer & Business Products |  |
Schedule Of Investments [Line Items] |  |
Percentage of Total Portfolio | 0.00% | 0.00%
Industry Sector Concentration Risk | Industry Sector Investments Benchmark | Semiconductors |  |
Schedule Of Investments [Line Items] |  |
Percentage of Total Portfolio | 0.00% | 0.00%
Industry Sector Concentration Risk | Industry Sector Investments Benchmark | Media/Content/Info |  |
Schedule Of Investments [Line Items] |  |
Percentage of Total Portfolio | 0.00% | 0.00%
Industry Sector Concentration Risk | Industry Sector Investments Benchmark | Drug Delivery |  |
Schedule Of Investments [Line Items] |  |
Percentage of Total Portfolio | 0.00% | 0.00%

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