Quarterly report pursuant to Section 13 or 15(d)

Debt - Summary of SBIC Investments (Details)

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Debt - Summary of SBIC Investments (Details)
$ in Thousands
Sep. 30, 2024
USD ($)
Firm
Dec. 31, 2023
USD ($)
Firm
Schedule Of Investments [Line Items]    
Fair value of investments (in millions) $ 3,560,513 $ 3,248,046
HC IV    
Schedule Of Investments [Line Items]    
Investments held by number of companies | Firm 28 25
Fair value of investments (in millions) $ 352,400 $ 331,500
Percentage of fair value of investments based on the Company's total investment portfolio 9.90% 10.20%
Tangible assets (in millions) $ 369,700 $ 341,800
Percentage of tangible assets based on the Company's total assets 10.10% 10.00%
Hercules SBIC V, L.P.    
Schedule Of Investments [Line Items]    
Investments held by number of companies | Firm 1 0
Fair value of investments (in millions) $ 11,200 $ 0
Percentage of fair value of investments based on the Company's total investment portfolio 0.30% 0.00%
Tangible assets (in millions) $ 13,300 $ 0
Percentage of tangible assets based on the Company's total assets 0.40% 0.00%