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Agreements and Related Party Transactions - Summary of Investments in Non-controlled Affiliates (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Investments In And Advances To Affiliates [Line Items]    
Fair Value, Beginning balance [1],[2],[3] $ 1,598,857  
Fair Value, Ending balance [4],[5],[6] 1,580,678  
Non-controlled Affiliated Investments    
Investments In And Advances To Affiliates [Line Items]    
Fair Value, Beginning balance 46,793 $ 52,619
Gross Additions 1,182 2,027
Gross Reductions (17,734) (4,580)
Net Realized Gains/ (Losses) (1,996) (4,828)
Change in Unrealized Gains/ (Losses) 2,231 5,765
Fair Value, Ending balance 30,476 51,003
Dividend, Interest, PIK and Other Income 3,383 4,546
Non-controlled Affiliated Investments | AX VI INV2 Holding AB    
Investments In And Advances To Affiliates [Line Items]    
Fair Value, Beginning balance 15,110 14,152
Gross Additions 578 901
Change in Unrealized Gains/ (Losses) 2,156 778
Fair Value, Ending balance 17,844 15,831
Dividend, Interest, PIK and Other Income 1,134 1,187
Non-controlled Affiliated Investments | ASP MCS Acquisition Corp.    
Investments In And Advances To Affiliates [Line Items]    
Fair Value, Beginning balance 728 799
Gross Additions 5 349
Gross Reductions   (2)
Change in Unrealized Gains/ (Losses) (41) 248
Fair Value, Ending balance 692 1,394
Dividend, Interest, PIK and Other Income   29
Non-controlled Affiliated Investments | Bayside Opco, LLC    
Investments In And Advances To Affiliates [Line Items]    
Fair Value, Beginning balance 7,920 6,704
Gross Additions 344 516
Gross Reductions (41) (46)
Change in Unrealized Gains/ (Losses) 1,683 770
Fair Value, Ending balance 9,906 7,944
Dividend, Interest, PIK and Other Income 880 910
Non-controlled Affiliated Investments | GACP II LP    
Investments In And Advances To Affiliates [Line Items]    
Fair Value, Beginning balance   3,927
Gross Reductions   (2,855)
Change in Unrealized Gains/ (Losses)   (384)
Fair Value, Ending balance   688
Non-controlled Affiliated Investments | Isagenix International, LLC    
Investments In And Advances To Affiliates [Line Items]    
Fair Value, Beginning balance 2,005 2,546
Gross Additions 255 235
Change in Unrealized Gains/ (Losses) (721) (102)
Fair Value, Ending balance 1,539 2,679
Dividend, Interest, PIK and Other Income 327 301
Non-controlled Affiliated Investments | Slickdeals Holdings, LLC    
Investments In And Advances To Affiliates [Line Items]    
Fair Value, Beginning balance 14,766 15,192
Gross Additions 0 3
Gross Reductions (12,736) (123)
Net Realized Gains/ (Losses) (1,996)  
Change in Unrealized Gains/ (Losses) (34) (213)
Fair Value, Ending balance 0 14,859
Dividend, Interest, PIK and Other Income 784 1,241
Non-controlled Affiliated Investments | smarTours, LLC    
Investments In And Advances To Affiliates [Line Items]    
Gross Additions   23
Net Realized Gains/ (Losses)   (4,828)
Change in Unrealized Gains/ (Losses)   4,805
Dividend, Interest, PIK and Other Income   70
Non-controlled Affiliated Investments | Vivid Seats Ltd    
Investments In And Advances To Affiliates [Line Items]    
Fair Value, Beginning balance 910 1,021
Change in Unrealized Gains/ (Losses) (415) (213)
Fair Value, Ending balance 495 808
Non-controlled Affiliated Investments | WhiteHawk III Onshore Fund L.P.    
Investments In And Advances To Affiliates [Line Items]    
Fair Value, Beginning balance 5,354 8,278
Gross Reductions (4,957) (1,554)
Change in Unrealized Gains/ (Losses) (397) 76
Fair Value, Ending balance 0 6,800
Dividend, Interest, PIK and Other Income $ 258 $ 808
[1] All debt investments are income-producing, unless otherwise noted. Equity and member interests are non-income-producing unless otherwise noted. The Company generally acquires its investments in private transactions exempt from registration under the Securities Act. Its investments are therefore generally subject to certain limitations on resale, and may be deemed to be “restricted securities” under the Securities Act.
[2] All positions held are non-controlled/non-affiliated investments, unless otherwise noted, as defined by the 1940 Act. Non-controlled/non-affiliated investments are investments that are neither controlled nor affiliated.
[3] The fair value of the investment was determined using significant unobservable inputs unless otherwise noted, as defined by the 1940 Act. See Note 2 “Summary of Significant Accounting Policies”.
[4] All debt investments are income-producing, unless otherwise noted. Equity and member interests are non-income-producing unless otherwise noted. The Company generally acquires its investments in private transactions exempt from registration under the Securities Act. Its investments are therefore generally subject to certain limitations on resale, and may be deemed to be “restricted securities” under the Securities Act.
[5] All positions held are non-controlled/non-affiliated investments, unless otherwise noted, as defined by the 1940 Act. Non-controlled/non-affiliated investments are investments that are neither controlled nor affiliated.
[6] The fair value of the investment was determined using significant unobservable inputs unless otherwise noted, as defined by the 1940 Act. See Note 2 “Summary of Significant Accounting Policies”.