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Investments - Schedule of Realized Gains and Losses and Changes in Unrealized Appreciation and Depreciation on Control and Affiliate investments (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022 | Dec. 31, 2021
Schedule Of Investments [Line Items] |  |  |  |  |  |
Investments, at fair value: | $ 3,261,391 |  | $ 3,261,391 |  | $ 2,963,955 |
Total fee income | 6,405 | $ 2,821 | 18,843 | $ 9,110 |  |
Total net change in unrealized appreciation (depreciation) | (46,240) | (2,089) | (6,277) | (87,147) |  |
Affiliate Investments |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |
Investments, at fair value: |  | 0 |  | 0 |  |
Total interest and dividend income |  | 81 |  | 1,204 |  |
Total fee income |  | 0 |  | 0 |  |
Total net change in unrealized appreciation (depreciation) |  | 4,631 |  | 4,089 |  |
Total net realized gain (loss) |  | (2,014) |  | 1,758 |  |
Control investments |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |
Investments, at fair value: | 103,150 | 80,325 | 103,150 | 80,325 | $ 76,458 | $ 73,504
Total interest and dividend income | 1,099 | 1,181 | 3,270 | 3,440 |  |
Total fee income | 22 | 18 | 60 | 51 |  |
Total net change in unrealized appreciation (depreciation) | (1,099) | (2,571) | 12,320 | 3,611 |  |
Total net realized gain (loss) | 0 | 0 | 0 | 0 |  |
Control investments | Coronado Aesthetics, LLC |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |
Investments, at fair value: | 247 | 400 | 247 | 400 |  |
Total interest and dividend income | 0 | 0 | 0 | 0 |  |
Total fee income | 0 | 0 | 0 | 0 |  |
Total net change in unrealized appreciation (depreciation) | (50) | (22) | (72) | (165) |  |
Total net realized gain (loss) | 0 | 0 | 0 | 0 |  |
Control investments | Gibraltar Business Capital, LLC |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |
Investments, at fair value: | 55,992 | 37,662 | 55,992 | 37,662 |  |
Total interest and dividend income | 772 | 853 | 2,299 | 2,531 |  |
Total fee income | 22 | 18 | 60 | 51 |  |
Total net change in unrealized appreciation (depreciation) | (1,726) | (1,423) | 4,676 | (6,228) |  |
Total net realized gain (loss) | 0 | 0 | 0 | 0 |  |
Control investments | Hercules Adviser LLC |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |
Investments, at fair value: | 40,668 | 33,945 | 40,668 | 33,945 |  |
Total interest and dividend income | 153 | 154 | 455 | 393 |  |
Total fee income | 0 | 0 | 0 | 0 |  |
Total net change in unrealized appreciation (depreciation) | 1,507 | (1,236) | 9,515 | 9,955 |  |
Total net realized gain (loss) | 0 | 0 | 0 | 0 |  |
Control investments | Tectura Corporation |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |
Investments, at fair value: | 6,243 | 8,318 | 6,243 | 8,318 |  |
Total interest and dividend income | 174 | 174 | 516 | 516 |  |
Total fee income | 0 | 0 | 0 | 0 |  |
Total net change in unrealized appreciation (depreciation) | (830) | 110 | (1,799) | 49 |  |
Total net realized gain (loss) | 0 | 0 | 0 | 0 |  |
Affiliate investments |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |
Total net change in unrealized appreciation (depreciation) | 0 | 4,631 | 0 | 4,089 |  |
Total net realized gain (loss) | $ 0 | (2,014) | $ 0 | 1,758 |  |
Affiliate investments | Black Crow AI, Inc. affiliates |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |
Investments, at fair value: |  | 0 |  | 0 |  |
Total interest and dividend income |  | 0 |  | 0 |  |
Total fee income |  | 0 |  | 0 |  |
Total net change in unrealized appreciation (depreciation) |  | 0 |  | (120) |  |
Total net realized gain (loss) |  | 0 |  | 3,772 |  |
Affiliate investments | Pineapple Energy LLC |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |
Investments, at fair value: |  | 0 |  | 0 |  |
Total interest and dividend income |  | 81 |  | 1,204 |  |
Total fee income |  | 0 |  | 0 |  |
Total net change in unrealized appreciation (depreciation) |  | 4,631 |  | 4,209 |  |
Total net realized gain (loss) |  | (2,014) |  | (2,014) |  |
Control and Affiliate Issuer Investments |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |
Investments, at fair value: |  | 80,325 |  | 80,325 |  |
Total interest and dividend income |  | 1,262 |  | 4,644 |  |
Total fee income |  | 18 |  | 51 |  |
Total net change in unrealized appreciation (depreciation) |  | 2,060 |  | 7,700 |  |
Total net realized gain (loss) |  | $ (2,014) |  | $ 1,758 |  |

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