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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 | 6 Months Ended |  |
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Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022 | Dec. 31, 2021
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total investments, at fair value |  | $ 3,112,789 |  |  |  | $ 3,112,789 |  |  |  | $ 2,963,955 |  |
Interest Income |  | 108,986 |  | $ 68,731 |  | 208,883 |  | $ 130,983 |  |  |  |
Fee Income |  | 7,245 |  | 3,384 |  | 12,438 |  | 6,289 |  |  |  |
Total net change in unrealized appreciation (depreciation) |  | 18,858 |  | (48,316) |  | 39,963 |  | (85,058) |  |  |  |
Total net realized gain (loss) |  | 217 |  | (2,133) |  | 8,177 |  | (4,514) |  |  |  |
Affiliate Investments |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total investments, at fair value | [1] |  |  | 3,613 |  |  |  | 3,613 |  |  |  |
Interest Income | [1] |  |  | 76 |  |  |  | 1,123 |  |  |  |
Fee Income | [1] |  |  | 0 |  |  |  | 0 |  |  |  |
Total net change in unrealized appreciation (depreciation) | [1] |  |  | (1,295) |  |  |  | (542) |  |  |  |
Total net realized gain (loss) | [1] |  |  | 0 |  |  |  | 3,772 |  |  |  |
Investment, Affiliated Issuer [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total investments, at fair value |  |  |  | 86,488 |  |  |  | 86,488 |  |  |  | $ 82,962
Interest Income |  | 0 |  | 76 |  | 0 |  | 1,123 |  |  |  |
Total net change in unrealized appreciation (depreciation) |  |  |  |  |  |  |  | 5,640 |  |  |  |
Total net realized gain (loss) |  |  |  |  |  |  |  | 3,772 |  |  |  |
Investment, Affiliated Issuer, Controlled [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total investments, at fair value |  | 90,923 | [1],[2] | 82,875 | [1] | 90,923 | [1],[2] | 82,875 | [1] | $ 76,458 | [3] | 73,504
Interest Income | [1] | 1,055 |  | 1,144 |  | 2,171 |  | 2,259 |  |  |  |
Fee Income | [1] | 19 |  | 17 |  | 38 |  | 33 |  |  |  |
Total net change in unrealized appreciation (depreciation) | [1] | 4,573 |  | 4,728 |  | 13,419 |  | 6,182 |  |  |  |
Total net realized gain (loss) | [1] | 0 |  | 0 |  | 0 |  | 0 |  |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Coronado Aesthetics, LLC |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total investments, at fair value | [1] | 297 |  | 422 |  | 297 |  | 422 |  |  |  |
Interest Income | [1] | 0 |  | 0 |  | 0 |  | 0 |  |  |  |
Fee Income | [1] | 0 |  | 0 |  | 0 |  | 0 |  |  |  |
Total net change in unrealized appreciation (depreciation) | [1] | (41) |  | (192) |  | (22) |  | (143) |  |  |  |
Total net realized gain (loss) | [1] | 0 |  | 0 |  | 0 |  | 0 |  |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Gibraltar Business Capital, LLC |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total investments, at fair value | [1] | 44,392 | [4] | 39,064 |  | 44,392 | [4] | 39,064 |  |  |  |
Interest Income | [1] | 731 | [4] | 844 |  | 1,527 | [4] | 1,678 |  |  |  |
Fee Income | [1] | 19 | [4] | 17 |  | 38 | [4] | 33 |  |  |  |
Total net change in unrealized appreciation (depreciation) | [1] | 2,667 | [4] | (3,578) |  | 6,402 | [4] | (4,805) |  |  |  |
Total net realized gain (loss) | [1] | 0 | [4] | 0 |  | 0 | [4] | 0 |  |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Hercules Adviser LLC |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total investments, at fair value | [1] | 39,161 |  | 35,181 |  | 39,161 |  | 35,181 |  |  |  |
Interest Income | [1] | 152 |  | 128 |  | 302 |  | 239 |  |  |  |
Fee Income | [1] | 0 |  | 0 |  | 0 |  | 0 |  |  |  |
Total net change in unrealized appreciation (depreciation) | [1] | 2,566 |  | 8,637 |  | 8,008 |  | 11,191 |  |  |  |
Total net realized gain (loss) | [1] | 0 |  | 0 |  | 0 |  | 0 |  |  |  |
Investment, Affiliated Issuer, Controlled [Member] | Tectura Corporation |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total investments, at fair value | [1] | 7,073 |  | 8,208 |  | 7,073 |  | 8,208 |  |  |  |
Interest Income | [1] | 172 |  | 172 |  | 342 |  | 342 |  |  |  |
Fee Income | [1] | 0 |  | 0 |  | 0 |  | 0 |  |  |  |
Total net change in unrealized appreciation (depreciation) | [1] | (701) |  | (139) |  | (969) |  | (61) |  |  |  |
Total net realized gain (loss) | [1] | 0 |  | 0 |  | 0 |  | 0 |  |  |  |
Control and Affiliate Issuer Investments [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total investments, at fair value | [1] |  |  | 86,488 |  |  |  | 86,488 |  |  |  |
Interest Income | [1] |  |  | 1,220 |  |  |  | 3,382 |  |  |  |
Fee Income | [1] |  |  | 17 |  |  |  | 33 |  |  |  |
Total net change in unrealized appreciation (depreciation) | [1] |  |  | 3,433 |  |  |  | 5,640 |  |  |  |
Total net realized gain (loss) | [1] |  |  | 0 |  |  |  | 3,772 |  |  |  |
Investment, Affiliated Issuer, Noncontrolled [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total investments, at fair value |  |  |  | 3,613 |  |  |  | 3,613 |  |  |  | $ 9,458
Interest Income |  | 107,931 |  | 67,511 |  | 206,712 |  | 127,601 |  |  |  |
Total net change in unrealized appreciation (depreciation) |  | 0 |  | (1,295) |  | 0 |  | (542) |  |  |  |
Total net realized gain (loss) |  | $ 0 |  | 0 |  | $ 0 |  | 3,772 |  |  |  |
Investment, Affiliated Issuer, Noncontrolled [Member] | Black Crow AI, Inc. affiliates |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total investments, at fair value | [1],[5] |  |  | 0 |  |  |  | 0 |  |  |  |
Interest Income | [1],[5] |  |  | 0 |  |  |  | 0 |  |  |  |
Fee Income | [1],[5] |  |  | 0 |  |  |  | 0 |  |  |  |
Total net change in unrealized appreciation (depreciation) | [1],[5] |  |  | 0 |  |  |  | (120) |  |  |  |
Total net realized gain (loss) | [1],[5] |  |  | 0 |  |  |  | 3,772 |  |  |  |
Investment, Affiliated Issuer, Noncontrolled [Member] | Pineapple Energy LLC |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total investments, at fair value | [1],[5] |  |  | 3,613 |  |  |  | 3,613 |  |  |  |
Interest Income | [1],[5] |  |  | 76 |  |  |  | 1,123 |  |  |  |
Fee Income | [1],[5] |  |  | 0 |  |  |  | 0 |  |  |  |
Total net change in unrealized appreciation (depreciation) | [1],[5] |  |  | (1,295) |  |  |  | (422) |  |  |  |
Total net realized gain (loss) | [1],[5] |  |  | $ 0 |  |  |  | $ 0 |  |  |  |
[1] | In accordance with Rules 3-09, 4-08(g), and Rule 10-01(b)(1) of Regulation S-X, (“Rule 3-09”, “Rule 4-08(g)”, and “Rule 10-01(b)(1)”, respectively), the Company must determine if its unconsolidated subsidiaries are considered “significant subsidiaries”. As of June 30, 2023, there were no unconsolidated subsidiaries that are considered “significant subsidiaries”. As of June 30, 2022, the Hercules Adviser, LLC qualified as a significant subsidiary pursuant to Rule 10-01(b)(1). The total revenue, operating income, and net income were $3.5 million, $(1.9) million, and $(1.8) million for the six months ended June 30, 2022.
[2] | All of the Company’s control and affiliate investments are Level 3 investments valued using significant unobservable inputs.
[3] | All of the Company’s control and affiliate investments are Level 3 investments valued using significant unobservable inputs.
[4] | Gibraltar Acquisition LLC is a wholly-owned subsidiary, which is the holding company for their wholly-owned affiliated portfolio companies, Gibraltar Business Capital, LLC and Gibraltar Equipment Finance, LLC. The subsidiary has no significant assets or liabilities, other than their equity and debt investments and equity interest in Gibraltar Business Capital, LLC and Gibraltar Equipment Finance, LLC, respectively.
[5] | As of September 30, 2022, Black Crow AI, Inc. and Pineapple Energy LLC were no longer affiliates as defined under the 1940 Act.

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