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CONSOLIDATED SCHEDULE OF INVESTMENTS IN AND ADVANCES TO AFFILIATES - Summary of Schedule of Investment (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024 | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | --- | --- | ---
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Investment cost | $ 3,995,082 | $ 3,708,877 |  |
Investments, at fair value: | $ 3,924,450 | $ 3,659,978 |  |
Control investments |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Investment owned, percent of net assets | 5.78% | 5.69% |  |
Investment cost | $ 105,494 | $ 104,916 |  |
Investments, at fair value: | $ 115,734 | $ 113,179 | $ 112,215 | $ 115,004
Control investments | Majority Owned Control Investments |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Investment owned, percent of net assets | 5.20% | 5.10% |  |
Investment cost | $ 83,081 | $ 82,503 |  |
Investments, at fair value: | $ 103,964 | $ 101,522 | 100,098 | 103,487
Control investments | Other Control Investments |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Investment owned, percent of net assets | 0.58% | 0.59% |  |
Investment cost | $ 22,413 | $ 22,413 |  |
Investments, at fair value: | 11,770 | 11,657 | 12,117 | 11,517
Control investments | Coronado Aesthetics, LLC |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Investments, at fair value: | 47 |  | 283 |
Control investments | Coronado Aesthetics, LLC | Majority Owned Control Investments | Preferred Stock |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Investments, at fair value: | 47 | 69 | 282 | 260
Control investments | Coronado Aesthetics, LLC | Majority Owned Control Investments | Common Stock |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Investments, at fair value: | 0 | 0 | 1 | 2
Control investments | Coronado Aesthetics, LLC | Medical Devices & Equipment | Majority Owned Control Investments |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Investment cost | 250 | 250 |  |
Investments, at fair value: | $ 47 | $ 69 |  |
Control investments | Coronado Aesthetics, LLC | Medical Devices & Equipment | Majority Owned Control Investments | Common Stock |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Shares (in shares) | 180,000 | 180,000 |  |
Investment cost | $ 0 | $ 0 |  |
Investments, at fair value: | $ 0 | $ 0 |  |
Control investments | Coronado Aesthetics, LLC | Medical Devices & Equipment | Preferred Series A | Majority Owned Control Investments | Preferred Stock |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Shares (in shares) | 5,000,000 | 5,000,000 |  |
Investment cost | $ 250 | $ 250 |  |
Investments, at fair value: | 47 | 69 |  |
Control investments | Gibraltar Business Capital, LLC |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Investments, at fair value: | 58,900 |  | 57,931 |
Control investments | Gibraltar Business Capital, LLC | Majority Owned Control Investments | Unsecured Debt |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Investments, at fair value: | 36,790 | 36,212 | 34,518 | 34,478
Control investments | Gibraltar Business Capital, LLC | Majority Owned Control Investments | Member Units |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Investments, at fair value: | 22,110 | 23,051 | 23,413 | 28,034
Control investments | Gibraltar Business Capital, LLC | Diversified Financial Services | Majority Owned Control Investments |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Investment cost | 70,796 | 70,218 |  |
Investments, at fair value: | $ 58,900 | $ 59,263 |  |
Control investments | Gibraltar Business Capital, LLC | Diversified Financial Services | Majority Owned Control Investments | Unsecured Debt One |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Maturity Date | 2026-09 | 2026-09 |  |
Interest rate and floor, fixed | 3.45% | 3.45% |  |
Investment, interest rate, paid in kind | 8.05% | 8.05% |  |
Principal amount | $ 27,104 | $ 26,569 |  |
Investment cost | 26,899 | 26,337 |  |
Investments, at fair value: | $ 26,899 | $ 26,337 |  |
Control investments | Gibraltar Business Capital, LLC | Diversified Financial Services | Majority Owned Control Investments | Unsecured Debt Two |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Maturity Date | 2026-09 | 2026-09 |  |
Interest rate and floor, fixed | 11.95% | 11.95% |  |
Principal amount | $ 10,000 | $ 10,000 |  |
Investment cost | 9,891 | 9,875 |  |
Investments, at fair value: | $ 9,891 | $ 9,875 |  |
Control investments | Gibraltar Business Capital, LLC | Diversified Financial Services | Majority Owned Control Investments | Member Units |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Shares (in shares) | 1 | 1 |  |
Investment cost | $ 34,006 | $ 34,006 |  |
Investments, at fair value: | 22,110 | 23,051 |  |
Control investments | Hercules Adviser LLC |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Investments, at fair value: | 45,017 |  | 41,884 |
Control investments | Hercules Adviser LLC | Majority Owned Control Investments | Unsecured Debt |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Investments, at fair value: | 0 | 12,000 | 12,000 | 12,000
Control investments | Hercules Adviser LLC | Majority Owned Control Investments | Member Units |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Investments, at fair value: | 45,017 | 30,190 | 29,884 | 28,713
Control investments | Hercules Adviser LLC | Diversified Financial Services | Majority Owned Control Investments |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Investment cost | 12,035 | 12,035 |  |
Investments, at fair value: | $ 45,017 | $ 42,190 |  |
Control investments | Hercules Adviser LLC | Diversified Financial Services | Majority Owned Control Investments | Unsecured Debt |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Maturity Date |  | 2025-06 |  |
Interest rate and floor, fixed |  | 5.00% |  |
Principal amount |  | $ 12,000 |  |
Investment cost |  | 12,000 |  |
Investments, at fair value: |  | $ 12,000 |  |
Control investments | Hercules Adviser LLC | Diversified Financial Services | Majority Owned Control Investments | Member Units |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Shares (in shares) | 1 | 1 |  |
Investment cost | $ 12,035 | $ 35 |  |
Investments, at fair value: | 45,017 | 30,190 |  |
Control investments | Tectura Corporation |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Investments, at fair value: | 11,770 |  | 12,117 |
Control investments | Tectura Corporation | Other Control Investments | Preferred Stock |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Investments, at fair value: | 3,736 | 3,623 | 3,856 | 3,263
Control investments | Tectura Corporation | Other Control Investments | Common Stock |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Investments, at fair value: | 2 | 7 | 11 | 4
Control investments | Tectura Corporation | Other Control Investments | Senior Secured Debt |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Investments, at fair value: | 8,032 | 8,027 | $ 8,250 | $ 8,250
Control investments | Tectura Corporation | Consumer & Business Services | Other Control Investments |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Investment cost | 22,413 | 22,413 |  |
Investments, at fair value: | $ 11,770 | $ 11,657 |  |
Control investments | Tectura Corporation | Consumer & Business Services | Other Control Investments | Common Stock |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Shares (in shares) | 414,994,863 | 414,994,863 |  |
Investment cost | $ 900 | $ 900 |  |
Investments, at fair value: | $ 2 | $ 7 |  |
Control investments | Tectura Corporation | Consumer & Business Services | Other Control Investments | Senior Secured Debt |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Maturity Date | 2027-01 | 2027-01 |  |
Interest rate and floor, fixed | 8.25% | 8.25% |  |
Principal amount | $ 8,250 | $ 8,250 |  |
Investment cost | 8,250 | 8,250 |  |
Investments, at fair value: | $ 8,032 | $ 8,027 |  |
Control investments | Tectura Corporation | Consumer & Business Services | Preferred Series BB | Other Control Investments | Preferred Stock |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Shares (in shares) | 1,000,000 | 1,000,000 |  |
Investment cost | $ 0 | $ 0 |  |
Investments, at fair value: | $ 7 | $ 17 |  |
Control investments | Tectura Corporation | Consumer & Business Services | Series C Preferred Stock | Other Control Investments | Preferred Stock |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Shares (in shares) | 3,235,298 | 3,235,298 |  |
Investment cost | $ 13,263 | $ 13,263 |  |
Investments, at fair value: | $ 3,729 | $ 3,606 |  |

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