Agreements and Related Party Transactions - Summary of Investments in Non-controlled Affiliates (Details) - Non-controlled Affiliated Investments - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2023	Mar. 31, 2022
Investments In And Advances To Affiliates [Line Items]
Fair Value, Beginning balance	$ 43,080	$ 51,701
Gross Additions	6,596	2,619
Gross Reductions	(203)	(16,059)
Net Realized Gains/ (Losses)		7,113
Change in Unrealized Gains/ (Losses)	365	(3,077)
Fair Value, Ending balance	49,838	42,297
Dividend, Interest, PIK and Other Income	1,289	4,661
AX VI INV2 Holding AB
Investments In And Advances To Affiliates [Line Items]
Fair Value, Beginning balance	12,117
Gross Additions	1,330
Change in Unrealized Gains/ (Losses)	715
Fair Value, Ending balance	14,162
Dividend, Interest, PIK and Other Income	241
ASP MCS Acquisition Corp.
Investments In And Advances To Affiliates [Line Items]
Fair Value, Beginning balance	826	1,616
Gross Additions	110	1
Gross Reductions	(1)	(1)
Change in Unrealized Gains/ (Losses)	22	(300)
Fair Value, Ending balance	957	1,316
Dividend, Interest, PIK and Other Income	8	5
Battery Solutions, Inc.
Investments In And Advances To Affiliates [Line Items]
Fair Value, Beginning balance		7,031
Gross Additions		2,116
Gross Reductions		(14,712)
Net Realized Gains/ (Losses)		7,113
Change in Unrealized Gains/ (Losses)		(1,548)
Dividend, Interest, PIK and Other Income		2,114
GACP II LP
Investments In And Advances To Affiliates [Line Items]
Fair Value, Beginning balance	4,889	12,619
Gross Reductions	(192)	(1,309)
Change in Unrealized Gains/ (Losses)	(84)	479
Fair Value, Ending balance	4,613	11,789
Dividend, Interest, PIK and Other Income	286	167
Slickdeals Holdings, LLC
Investments In And Advances To Affiliates [Line Items]
Fair Value, Beginning balance	15,433	15,847
Gross Additions	23	24
Gross Reductions	(10)	(37)
Change in Unrealized Gains/ (Losses)	(142)	(84)
Fair Value, Ending balance	15,304	15,750
Dividend, Interest, PIK and Other Income	411	267
smarTours, LLC
Investments In And Advances To Affiliates [Line Items]
Gross Additions	4,285
Change in Unrealized Gains/ (Losses)	(31)
Fair Value, Ending balance	4,254
Dividend, Interest, PIK and Other Income	1
Southern Technical Institute, Inc.
Investments In And Advances To Affiliates [Line Items]
Fair Value, Beginning balance		7,686
Change in Unrealized Gains/ (Losses)		(1,147)
Fair Value, Ending balance		6,539
Dividend, Interest, PIK and Other Income		1,923
Vivid Seats Ltd
Investments In And Advances To Affiliates [Line Items]
Fair Value, Beginning balance	944	922
Change in Unrealized Gains/ (Losses)	11	16
Fair Value, Ending balance	955	938
WhiteHawk III Onshore Fund L.P.
Investments In And Advances To Affiliates [Line Items]
Fair Value, Beginning balance	8,871	5,980
Gross Additions	848	478
Change in Unrealized Gains/ (Losses)	(126)	(493)
Fair Value, Ending balance	9,593	5,965
Dividend, Interest, PIK and Other Income	$ 342	$ 185

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))
-URI https://asc.fasb.org/extlink&oid=122147990&loc=d3e611322-123010

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 320
-Section S99
-Paragraph 6
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