v3.26.1
Significant Agreements And Related Party Transactions - Schedule of Affiliated Investments Including Investments in Money Market Funds (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Non-Controlled Affiliates      
Schedule Of Investments [Line Items]      
Beginning Fair Value Balance $ 125,768 $ 131,993 $ 131,993
Gross Additions [1] 143,552   1,289,056
Gross Reductions [2] (190,344)   (1,274,574)
Net Realized Gain(Loss) 0 (22,902) (33,824)
Net Change in Unrealized Appreciation (Depreciation) (7,028) 19,901 13,117
Ending Fair Value Balance 71,948   125,768
Dividend, Interest, PIK and Other Income 1,212   8,320
Investment, Identifier [Axis]: Non-Controlled Affiliates Animal Supply Holdings, LLC      
Schedule Of Investments [Line Items]      
Beginning Fair Value Balance 0 0 0
Gross Additions [1]     0
Gross Reductions [2]     0
Net Realized Gain(Loss)     (22,902)
Net Change in Unrealized Appreciation (Depreciation)     22,902
Ending Fair Value Balance     0
Dividend, Interest, PIK and Other Income     0
Investment, Identifier [Axis]: Non-Controlled Affiliates Conergy Asia & ME Pte. LTD      
Schedule Of Investments [Line Items]      
Beginning Fair Value Balance 0 0 0
Gross Additions [1]     0
Gross Reductions [2]     0
Net Realized Gain(Loss)     (6,355)
Net Change in Unrealized Appreciation (Depreciation)     6,355
Ending Fair Value Balance     0
Dividend, Interest, PIK and Other Income     0
Investment, Identifier [Axis]: Non-Controlled Affiliates Elah Holdings Inc.      
Schedule Of Investments [Line Items]      
Beginning Fair Value Balance 5,396 5,396 5,396
Gross Additions [1] 0   0
Gross Reductions [2] 0   0
Net Realized Gain(Loss) 0   0
Net Change in Unrealized Appreciation (Depreciation) 0   0
Ending Fair Value Balance 5,396   5,396
Dividend, Interest, PIK and Other Income 0   0
Investment, Identifier [Axis]: Non-Controlled Affiliates Goldman Sachs Financial Square Government Fund      
Schedule Of Investments [Line Items]      
Beginning Fair Value Balance 35,724 25,238 25,238
Gross Additions [1] 143,427   1,280,435
Gross Reductions [2] (176,675)   (1,269,949)
Net Realized Gain(Loss) 0   0
Net Change in Unrealized Appreciation (Depreciation) 0   0
Ending Fair Value Balance 2,476   35,724
Dividend, Interest, PIK and Other Income 125   785
Investment, Identifier [Axis]: Non-Controlled Affiliates Iracore International Holdings, Inc.      
Schedule Of Investments [Line Items]      
Beginning Fair Value Balance 2,728 7,015 7,015
Gross Additions [1] 0   0
Gross Reductions [2] 0   (1,502)
Net Realized Gain(Loss) 0   0
Net Change in Unrealized Appreciation (Depreciation) (331)   (2,785)
Ending Fair Value Balance 2,397   2,728
Dividend, Interest, PIK and Other Income 0   177
Investment, Identifier [Axis]: Non-Controlled Affiliates Kawa Solar Holdings Limited      
Schedule Of Investments [Line Items]      
Beginning Fair Value Balance 0 741 741
Gross Additions [1]     0
Gross Reductions [2]     (614)
Net Realized Gain(Loss)     (4,567)
Net Change in Unrealized Appreciation (Depreciation)     4,440
Ending Fair Value Balance     0
Dividend, Interest, PIK and Other Income     0
Investment, Identifier [Axis]: Non-Controlled Affiliates MedeAnalytics Group Holdings, LLC      
Schedule Of Investments [Line Items]      
Beginning Fair Value Balance 158 156 156
Gross Additions [1] 0   0
Gross Reductions [2] (142)   0
Net Realized Gain(Loss) 0   0
Net Change in Unrealized Appreciation (Depreciation) (16)   2
Ending Fair Value Balance 0   158
Dividend, Interest, PIK and Other Income 0   0
Investment, Identifier [Axis]: Non-Controlled Affiliates Pluralsight, Inc.      
Schedule Of Investments [Line Items]      
Beginning Fair Value Balance 27,494 42,214 42,214
Gross Additions [1] 80   1,812
Gross Reductions [2] (36)   (73)
Net Realized Gain(Loss) 0   0
Net Change in Unrealized Appreciation (Depreciation) (8,983)   (16,459)
Ending Fair Value Balance 18,555   27,494
Dividend, Interest, PIK and Other Income 320   2,932
Investment, Identifier [Axis]: Non-Controlled Affiliates RPC ABC Investment Holdco LLC dba ABC Plumbing      
Schedule Of Investments [Line Items]      
Beginning Fair Value Balance 11,574 11,551 11,551
Gross Additions [1] 0   1,595
Gross Reductions [2] (12,633)   (543)
Net Realized Gain(Loss) 0   0
Net Change in Unrealized Appreciation (Depreciation) 1,059   (1,029)
Ending Fair Value Balance 0   11,574
Dividend, Interest, PIK and Other Income 0   1,135
Investment, Identifier [Axis]: Non-Controlled Affiliates SDB HOLDCO, LLC dba Specialty Dental Brands      
Schedule Of Investments [Line Items]      
Beginning Fair Value Balance 602 814 814
Gross Additions [1] 3   51
Gross Reductions [2] (1)   (1)
Net Realized Gain(Loss) 0   0
Net Change in Unrealized Appreciation (Depreciation) (132)   (262)
Ending Fair Value Balance 472   602
Dividend, Interest, PIK and Other Income 5   63
Investment, Identifier [Axis]: Non-Controlled Affiliates SEM Holdings, LLC dba Southeast Mechanical, LLC      
Schedule Of Investments [Line Items]      
Beginning Fair Value Balance 23,184 21,130 21,130
Gross Additions [1] 42   4,262
Gross Reductions [2] (46)   (1,892)
Net Realized Gain(Loss) 0   0
Net Change in Unrealized Appreciation (Depreciation) (543)   (316)
Ending Fair Value Balance 22,637   23,184
Dividend, Interest, PIK and Other Income 596   2,458
Investment, Identifier [Axis]: Non-Controlled Affiliates Thrasio Holdings, Inc.      
Schedule Of Investments [Line Items]      
Beginning Fair Value Balance 18,908 $ 17,738 17,738
Gross Additions [1] 0   901
Gross Reductions [2] (811)   0
Net Realized Gain(Loss) 0   0
Net Change in Unrealized Appreciation (Depreciation) 1,918   269
Ending Fair Value Balance 20,015   18,908
Dividend, Interest, PIK and Other Income $ 166   $ 770
[1] Gross additions may include increases in the cost basis of investments resulting from new portfolio investments, PIK, the accretion of discounts, the exchange of one or more existing securities for one or more new securities and the movement of an existing portfolio company into this category from a different category.
[2] Gross reductions may include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, the exchange of one or more existing securities for one or more new securities and the movement of an existing portfolio company out of this category into a different category.