Quarterly report [Sections 13 or 15(d)]

CONSOLIDATED SCHEDULE OF INVESTMENTS IN AND ADVANCES TO AFFILIATES - Summary of Schedule of Investment Gain/(Loss) (Details)

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CONSOLIDATED SCHEDULE OF INVESTMENTS IN AND ADVANCES TO AFFILIATES - Summary of Schedule of Investment Gain/(Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Investments in and Advances to Affiliates [Line Items]        
Amount of Interest and Fees Credited to Income $ 137,459 $ 125,006 $ 256,970 $ 246,559
Investments, fair value, beginning balance     3,659,978  
Net Change in Unrealized Appreciation (Depreciation) 47,790 (34,722) 22,225 (31,088)
Investments, fair value, ending balance 4,176,486   4,176,486  
Control investments        
Investments in and Advances to Affiliates [Line Items]        
Amount of Interest and Fees Credited to Income     7,085 6,486
Realized Gain (Loss) 0 0 0 0
Investments, fair value, beginning balance     113,179 115,004
Gross Additions     13,176 590
Gross Reductions     (12,600) 0
Net Change in Unrealized Appreciation (Depreciation) (836) (1,506) 1,141 (4,335)
Investments, fair value, ending balance 114,896 111,259 114,896 111,259
Control investments | Majority Owned Control Investments        
Investments in and Advances to Affiliates [Line Items]        
Amount of Interest and Fees Credited to Income     6,743 6,142
Realized Gain (Loss)     0 0
Investments, fair value, beginning balance     101,522 103,487
Gross Additions     13,176 590
Gross Reductions     (12,600) 0
Net Change in Unrealized Appreciation (Depreciation)     2,780 (4,352)
Investments, fair value, ending balance 104,878 99,725 104,878 99,725
Control investments | Other Control Investments        
Investments in and Advances to Affiliates [Line Items]        
Amount of Interest and Fees Credited to Income     342 344
Realized Gain (Loss)     0 0
Investments, fair value, beginning balance     11,657 11,517
Gross Additions     0 0
Gross Reductions     0 0
Net Change in Unrealized Appreciation (Depreciation)     (1,639) 17
Investments, fair value, ending balance 10,018 11,534 10,018 11,534
Coronado Aesthetics, LLC | Control investments        
Investments in and Advances to Affiliates [Line Items]        
Realized Gain (Loss) 0 0 0 0
Net Change in Unrealized Appreciation (Depreciation) 267 (97) 244 (76)
Investments, fair value, ending balance 313 186 313 186
Gibraltar Business Capital, LLC | Control investments        
Investments in and Advances to Affiliates [Line Items]        
Realized Gain (Loss) 0 0 0 0
Net Change in Unrealized Appreciation (Depreciation) 1,444 (1,670) 504 (6,291)
Investments, fair value, ending balance 60,343 56,811 60,343 56,811
Hercules Adviser LLC | Control investments        
Investments in and Advances to Affiliates [Line Items]        
Realized Gain (Loss) 0 0 0 0
Net Change in Unrealized Appreciation (Depreciation) (795) 844 2,032 2,015
Investments, fair value, ending balance 44,222 42,728 44,222 42,728
Tectura Corporation | Control investments        
Investments in and Advances to Affiliates [Line Items]        
Realized Gain (Loss) 0 0 0 0
Net Change in Unrealized Appreciation (Depreciation) (1,752) (583) (1,639) 17
Investments, fair value, ending balance 10,018 11,534 10,018 11,534
Preferred Stock | Coronado Aesthetics, LLC | Control investments | Majority Owned Control Investments        
Investments in and Advances to Affiliates [Line Items]        
Amount of Interest and Fees Credited to Income     0 0
Realized Gain (Loss)     0 0
Investments, fair value, beginning balance     69 260
Gross Additions     0 0
Gross Reductions     0 0
Net Change in Unrealized Appreciation (Depreciation)     243 (75)
Investments, fair value, ending balance 312 185 312 185
Preferred Stock | Tectura Corporation | Control investments | Other Control Investments        
Investments in and Advances to Affiliates [Line Items]        
Amount of Interest and Fees Credited to Income     0 0
Realized Gain (Loss)     0 0
Investments, fair value, beginning balance     3,623 3,263
Gross Additions     0 0
Gross Reductions     0 0
Net Change in Unrealized Appreciation (Depreciation)     (1,581) 16
Investments, fair value, ending balance 2,042 3,279 2,042 3,279
Common Stock | Coronado Aesthetics, LLC | Control investments | Majority Owned Control Investments        
Investments in and Advances to Affiliates [Line Items]        
Amount of Interest and Fees Credited to Income     0 0
Realized Gain (Loss)     0 0
Investments, fair value, beginning balance     0 2
Gross Additions     0 0
Gross Reductions     0 0
Net Change in Unrealized Appreciation (Depreciation)     1 (1)
Investments, fair value, ending balance 1 1 1 1
Common Stock | Tectura Corporation | Control investments | Other Control Investments        
Investments in and Advances to Affiliates [Line Items]        
Amount of Interest and Fees Credited to Income     0 0
Realized Gain (Loss)     0 0
Investments, fair value, beginning balance     7 4
Gross Additions     0 0
Gross Reductions     0 0
Net Change in Unrealized Appreciation (Depreciation)     (7) 1
Investments, fair value, ending balance 0 5 0 5
Unsecured Debt | Gibraltar Business Capital, LLC | Control investments | Majority Owned Control Investments        
Investments in and Advances to Affiliates [Line Items]        
Amount of Interest and Fees Credited to Income     2,743 2,639
Realized Gain (Loss)     0 0
Investments, fair value, beginning balance     36,212 34,478
Gross Additions     1,176 590
Gross Reductions     0 0
Net Change in Unrealized Appreciation (Depreciation)     0 0
Investments, fair value, ending balance 37,388 35,068 37,388 35,068
Unsecured Debt | Hercules Adviser LLC | Control investments | Majority Owned Control Investments        
Investments in and Advances to Affiliates [Line Items]        
Amount of Interest and Fees Credited to Income     4,000 3,503
Realized Gain (Loss)     0 0
Investments, fair value, beginning balance     12,000 12,000
Gross Additions     0 0
Gross Reductions     (12,000) 0
Net Change in Unrealized Appreciation (Depreciation)     0 0
Investments, fair value, ending balance 0 12,000 0 12,000
Member Units | Gibraltar Business Capital, LLC | Control investments | Majority Owned Control Investments        
Investments in and Advances to Affiliates [Line Items]        
Amount of Interest and Fees Credited to Income     0 0
Realized Gain (Loss)     0 0
Investments, fair value, beginning balance     23,051 28,034
Gross Additions     0 0
Gross Reductions     (600) 0
Net Change in Unrealized Appreciation (Depreciation)     504 (6,291)
Investments, fair value, ending balance 22,955 21,743 22,955 21,743
Member Units | Hercules Adviser LLC | Control investments | Majority Owned Control Investments        
Investments in and Advances to Affiliates [Line Items]        
Amount of Interest and Fees Credited to Income     0 0
Realized Gain (Loss)     0 0
Investments, fair value, beginning balance     30,190 28,713
Gross Additions     12,000 0
Gross Reductions     0 0
Net Change in Unrealized Appreciation (Depreciation)     2,032 2,015
Investments, fair value, ending balance 44,222 30,728 44,222 30,728
Senior Secured Debt | Tectura Corporation | Control investments | Other Control Investments        
Investments in and Advances to Affiliates [Line Items]        
Amount of Interest and Fees Credited to Income     342 344
Realized Gain (Loss)     0 0
Investments, fair value, beginning balance     8,027 8,250
Gross Additions     0 0
Gross Reductions     0 0
Net Change in Unrealized Appreciation (Depreciation)     (51) 0
Investments, fair value, ending balance $ 7,976 $ 8,250 $ 7,976 $ 8,250