Related Party Transactions - Schedule of the Fees and Expenses Accrued (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Related Party Transaction [Line Items]
Administrative services expenses		$ 1,887	$ 1,695	$ 4,566	$ 4,605
Management fees		7,778	11,350	26,957	33,361
Investment company, contractual fee waived	[1]	63	208	337	2,606
Management fees payable		7,715		7,715		$ 11,185
Affiliated Entity | Investment Advisory Agreement
Related Party Transaction [Line Items]
Base management fee		7,715	11,142	26,620	30,755
Management fees				30,090	30,079
Investment company, contractual fee waived		63	208	337	2,606
Management fees payable		7,715		7,715
Accounting and administrative fees				2,386	1,999
Payment for administrative services expenses				4,017	3,284
Affiliated Entity | Administrative Services Expense
Related Party Transaction [Line Items]
Administrative services expenses		$ 1,887	$ 1,695	$ 4,566	$ 4,605

[1] See Note 4 for a discussion of the offset by FS/EIG Advisor, LLC, the Company's investment adviser, of certain management fees to which it was otherwise entitled during the applicable period.