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Fair Value Measurement - Summary of Reconciliation of Level 3 Assets (Details) - Level 3 - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance $ 192,891 $ 142,737
Net Transfers In/Out (12,093) 18,628
Purchases [1] 74,720 108,483
Net Realized Gain (Loss) 4,742 (36)
Net Change in Unrealized Appreciation (Depreciation) [2] (7,732) (11,150)
Sales and Settlements [1] (74,072) (66,155)
Net Amortization of Premium/ Discount 545 384
Ending Balance 179,001 192,891
Debt    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance 159,954 122,693
Net Transfers In/Out (12,093) 17,179
Purchases [1] 62,324 80,149
Net Realized Gain (Loss) 621 (36)
Net Change in Unrealized Appreciation (Depreciation) [2] (5,413) 740
Sales and Settlements [1] (68,883) (61,155)
Net Amortization of Premium/ Discount 545 384
Ending Balance 137,055 159,954
Equity/Other    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance 32,937 20,044
Net Transfers In/Out   1,449
Purchases [1] 12,396 28,334
Net Realized Gain (Loss) 4,121  
Net Change in Unrealized Appreciation (Depreciation) [2] (2,319) (11,890)
Sales and Settlements [1] (5,189) (5,000)
Ending Balance $ 41,946 $ 32,937
[1] Purchases may include new deals, additional fundings (inclusive of those on revolving credit facilities), refinancings, capitalized PIK income, and securities received in corporate actions and restructurings. Sales and Settlements may include scheduled principal payments, prepayments, sales and repayments (inclusive of those on revolving credit facilities), and securities delivered in corporate actions and restructuring of investments.
[2] The net change in unrealized depreciation relating to Level 3 assets still held at September 30, 2025 totaled $(10,748) consisting of the following: $(8,429) related to debt investments and $(2,319) related to equity investments. The net change in unrealized depreciation relating to Level 3 assets still held at December 31, 2024 totaled $(15,902) consisting of the following: $(4,822) related to debt investments and $(11,080) relating to equity/other.