Agreements and Related Party Transactions - Summary of Investments in Non-controlled Affiliates (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Investments In And Advances To Affiliates [Line Items]
Net Realized Gains/ (Losses)	$ (5,482)	$ (16,849)	$ 35,651
Non-controlled Affiliated Investments
Investments In And Advances To Affiliates [Line Items]
Fair Value, Beginning balance	51,701	71,354
Gross Additions	18,631	7,535
Gross Reductions	(24,932)	(45,534)
Net Realized Gains/ (Losses)	7,098	28,810
Change in Unrealized Gains/ (Losses)	(9,418)	(10,464)
Fair Value, Ending balance	43,080	51,701	71,354
Dividend, Interest, PIK and Other Income	8,900	4,822
Non-controlled Affiliated Investments \| AX VI INV2 Holding AB
Investments In And Advances To Affiliates [Line Items]
Gross Additions	11,436
Change in Unrealized Gains/ (Losses)	(681)
Fair Value, Ending balance	12,117
Dividend, Interest, PIK and Other Income	321
Non-controlled Affiliated Investments \| ASP MCS Acquisition Corp.
Investments In And Advances To Affiliates [Line Items]
Fair Value, Beginning balance	1,616	1,793
Gross Additions	263	3
Gross Reductions	(3)	(3)
Change in Unrealized Gains/ (Losses)	(1,050)	(177)
Fair Value, Ending balance	826	1,616	1,793
Dividend, Interest, PIK and Other Income	28	25
Non-controlled Affiliated Investments \| Battery Solutions, Inc.
Investments In And Advances To Affiliates [Line Items]
Fair Value, Beginning balance	7,031	3,565
Gross Additions	2,129	567
Gross Reductions	(14,712)
Net Realized Gains/ (Losses)	7,098
Change in Unrealized Gains/ (Losses)	(1,546)	2,899
Fair Value, Ending balance		7,031	3,565
Dividend, Interest, PIK and Other Income	2,113	230
Non-controlled Affiliated Investments \| Conisus, LLC
Investments In And Advances To Affiliates [Line Items]
Fair Value, Beginning balance		22,865
Gross Additions		1,026
Gross Reductions		(38,628)
Net Realized Gains/ (Losses)		27,440
Change in Unrealized Gains/ (Losses)		(12,703)
Fair Value, Ending balance			22,865
Dividend, Interest, PIK and Other Income		1,026
Non-controlled Affiliated Investments \| GACP II LP
Investments In And Advances To Affiliates [Line Items]
Fair Value, Beginning balance	12,619	16,154
Gross Reductions	(7,804)	(3,332)
Change in Unrealized Gains/ (Losses)	74	(203)
Fair Value, Ending balance	4,889	12,619	16,154
Dividend, Interest, PIK and Other Income	1,593	1,373
Non-controlled Affiliated Investments \| Slickdeals Holdings, LLC
Investments In And Advances To Affiliates [Line Items]
Fair Value, Beginning balance	15,847	16,010
Gross Additions	93	88
Gross Reductions	(148)	(381)
Net Realized Gains/ (Losses)		72
Change in Unrealized Gains/ (Losses)	(359)	58
Fair Value, Ending balance	15,433	15,847	16,010
Dividend, Interest, PIK and Other Income	1,268	1,127
Non-controlled Affiliated Investments \| Southern Technical Institute, Inc.
Investments In And Advances To Affiliates [Line Items]
Fair Value, Beginning balance	7,686	7,253
Change in Unrealized Gains/ (Losses)	(7,686)	433
Fair Value, Ending balance		7,686	7,253
Dividend, Interest, PIK and Other Income	2,932	1,041
Non-controlled Affiliated Investments \| Vivid Seats Ltd
Investments In And Advances To Affiliates [Line Items]
Fair Value, Beginning balance	922	3,714
Gross Reductions		(3,190)
Net Realized Gains/ (Losses)		1,298
Change in Unrealized Gains/ (Losses)	22	(900)
Fair Value, Ending balance	944	922	$ 3,714
Non-controlled Affiliated Investments \| WhiteHawk III Onshore Fund L.P.
Investments In And Advances To Affiliates [Line Items]
Fair Value, Beginning balance	5,980
Gross Additions	4,710	5,851
Gross Reductions	(2,265)
Change in Unrealized Gains/ (Losses)	446	129
Fair Value, Ending balance	8,871	$ 5,980
Dividend, Interest, PIK and Other Income	$ 645

Value of the investment at close of period. For investment in and advances to affiliates, if operations of any controlled companies are different in character from those of the company, group such affiliates within divisions and by type of activities.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 6
-Subparagraph (SX 210.12-14(3))
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