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 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Investments in and Advances to Affiliates [Line Items]        
Amount of Interest and Fees Credited to Income $ 138,093 $ 125,248 $ 395,063 $ 371,807
Investments, fair value, beginning balance     3,659,978  
Net Change in Unrealized Appreciation (Depreciation) 32,989 (13,894) 55,214 (44,982)
Investments, fair value, ending balance 4,306,154   4,306,154  
Control investments        
Investments in and Advances to Affiliates [Line Items]        
Amount of Interest and Fees Credited to Income     10,526 10,009
Realized Gain (Loss) 0 0 0 0
Investments, fair value, beginning balance     113,179 115,004
Gross Additions     13,794 1,155
Gross Reductions     (13,250) 0
Net Change in Unrealized Appreciation (Depreciation) (2,541) 1,273 (1,400) (3,062)
Investments, fair value, ending balance 112,323 113,097 112,323 113,097
Control investments | Majority Owned Control Investments        
Investments in and Advances to Affiliates [Line Items]        
Amount of Interest and Fees Credited to Income     10,010 9,491
Realized Gain (Loss)     0 0
Investments, fair value, beginning balance     101,522 103,487
Gross Additions     13,794 1,155
Gross Reductions     (13,250) 0
Net Change in Unrealized Appreciation (Depreciation)     1,981 (3,588)
Investments, fair value, ending balance 104,047 101,054 104,047 101,054
Control investments | Other Control Investments        
Investments in and Advances to Affiliates [Line Items]        
Amount of Interest and Fees Credited to Income     516 518
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)     (3,381) 526
Investments, fair value, ending balance 8,276 12,043 8,276 12,043
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) 31 133 275 57
Investments, fair value, ending balance 344 319 344 319
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) (118) (74) 386 (6,365)
Investments, fair value, ending balance 60,193 57,302 60,193 57,302
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) (712) 705 1,320 2,720
Investments, fair value, ending balance 43,510 43,433 43,510 43,433
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) (1,742) 509 (3,381) 526
Investments, fair value, ending balance 8,276 12,043 8,276 12,043
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)     274 58
Investments, fair value, ending balance 343 318 343 318
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)     (3,414) 524
Investments, fair value, ending balance 209 3,787 209 3,787
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) 2
Investments, fair value, ending balance 0 6 0 6
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     3,910 4,034
Realized Gain (Loss)     0 0
Investments, fair value, beginning balance     36,212 34,478
Gross Additions     1,794 1,155
Gross Reductions     0 0
Net Change in Unrealized Appreciation (Depreciation)     0 0
Investments, fair value, ending balance 38,006 35,633 38,006 35,633
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     6,100 5,457
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     (1,250) 0
Net Change in Unrealized Appreciation (Depreciation)     386 (6,365)
Investments, fair value, ending balance 22,187 21,669 22,187 21,669
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)     1,320 2,720
Investments, fair value, ending balance 43,510 31,433 43,510 31,433
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     516 518
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)     40 0
Investments, fair value, ending balance $ 8,067 $ 8,250 $ 8,067 $ 8,250