Agreements and Related Party Transactions - Summary of Investments in Controlled Affiliates (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Investments In And Advances To Affiliates [Line Items]
Fair Value, Beginning balance	$ 1,262,956
Net Realized Gains/ (Losses)	(161,456)	$ (5,482)	$ (16,849)
Fair Value, Ending balance	1,582,075	1,262,956
Controlled Affiliated
Investments In And Advances To Affiliates [Line Items]
Fair Value, Beginning balance	11,375	52,768
Gross Additions	55,854	1,999
Gross Reductions	(2,139)	(38,491)
Net Realized Gains/ (Losses)		(3,301)
Change in Unrealized Gains/ (Losses)	(1,171)	(1,600)
Fair Value, Ending balance	63,919	11,375	52,768
Dividend, Interest, PIK and Other Income	11,601	3,835
Controlled Affiliated | CBDC Senior Loan Fund LLC
Investments In And Advances To Affiliates [Line Items]
Fair Value, Beginning balance		39,360
Gross Reductions		(36,698)
Net Realized Gains/ (Losses)		(3,301)
Change in Unrealized Gains/ (Losses)		639
Fair Value, Ending balance			39,360
Dividend, Interest, PIK and Other Income		2,358
Controlled Affiliated | Envocore LLC
Investments In And Advances To Affiliates [Line Items]
Fair Value, Beginning balance	11,375	13,408
Gross Additions	248	1,999
Gross Reductions	(69)	(1,793)
Change in Unrealized Gains/ (Losses)	(1,179)	(2,239)
Fair Value, Ending balance	10,375	11,375	$ 13,408
Dividend, Interest, PIK and Other Income	801	$ 1,477
Controlled Affiliated | First Eagle Logan JV, LLC
Investments In And Advances To Affiliates [Line Items]
Gross Additions	44,768
Gross Reductions	(796)
Change in Unrealized Gains/ (Losses)	(4,968)
Fair Value, Ending balance	39,004
Dividend, Interest, PIK and Other Income	10,800
Controlled Affiliated | Loadmaster Derrick & Equipment, Inc.
Investments In And Advances To Affiliates [Line Items]
Gross Additions	1,807
Gross Reductions	(250)
Change in Unrealized Gains/ (Losses)	4,730
Fair Value, Ending balance	6,287
Controlled Affiliated | OEM Group, LLC
Investments In And Advances To Affiliates [Line Items]
Gross Additions	9,031
Gross Reductions	(1,024)
Change in Unrealized Gains/ (Losses)	246
Fair Value, Ending balance	$ 8,253