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Agreements and Related Party Transactions - Summary of Investments in 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  
Controlled Affiliated    
Investments In And Advances To Affiliates [Line Items]    
Fair Value, Beginning balance 48,051 $ 63,919
Gross Additions 15,275 1,608
Gross Reductions (4,097) (8,656)
Net Realized Gains/ (Losses) (3,800) 6,443
Change in Unrealized Gains/ (Losses) 7,527 (15,231)
Fair Value, Ending balance 62,956 48,083
Dividend, Interest, PIK and Other Income 5,569 8,513
Controlled Affiliated | Envocore LLC    
Investments In And Advances To Affiliates [Line Items]    
Fair Value, Beginning balance 9,221 10,375
Gross Additions 1,821 1,608
Gross Reductions (1,719) (677)
Change in Unrealized Gains/ (Losses) 984 (2,387)
Fair Value, Ending balance 10,307 8,919
Dividend, Interest, PIK and Other Income 518 456
Controlled Affiliated | First Eagle Logan JV, LLC    
Investments In And Advances To Affiliates [Line Items]    
Fair Value, Beginning balance 32,575 39,004
Gross Additions 0  
Gross Reductions 0 (2,560)
Change in Unrealized Gains/ (Losses) 2,755 (5,046)
Fair Value, Ending balance 35,330 31,398
Dividend, Interest, PIK and Other Income 4,760 7,624
Controlled Affiliated | Loadmaster Derrick & Equipment, Inc.    
Investments In And Advances To Affiliates [Line Items]    
Fair Value, Beginning balance 3,476 6,287
Gross Reductions (126) (3,750)
Net Realized Gains/ (Losses)   6,443
Change in Unrealized Gains/ (Losses) 775 (4,807)
Fair Value, Ending balance 4,125 4,173
Dividend, Interest, PIK and Other Income 112 433
Controlled Affiliated | OEM Group, LLC    
Investments In And Advances To Affiliates [Line Items]    
Fair Value, Beginning balance 2,779 8,253
Gross Reductions (2,214) (1,669)
Net Realized Gains/ (Losses) (3,800)  
Change in Unrealized Gains/ (Losses) 3,235 (2,991)
Fair Value, Ending balance   $ 3,593
Controlled Affiliated | Slickdeals Holdings, LLC    
Investments In And Advances To Affiliates [Line Items]    
Gross Additions 13,454  
Gross Reductions (38)  
Change in Unrealized Gains/ (Losses) (222)  
Fair Value, Ending balance 13,194  
Dividend, Interest, PIK and Other Income $ 179  
[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”.