Portfolio Company Investments - Additional Information (Details)	3 Months Ended	12 Months Ended
Mar. 31, 2024 USD ($) Investment	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($) Investment
Schedule of Investments [Line Items]
Number of investment portfolio companies \| Investment	87		81
Number of residual investment porfolio companies \| Investment	4		1
Aggregate fair value of total portfolio	$ 1,048,071,000		$ 957,906,000
Weighted average yield investment percentage	14.00%		14.20%
Average fully diluted equity ownership percentage	3.50%		3.00%
Percentage of equity investments held in portfolio companies	81.30%		79.30%
Purchases of debt and equity investments	$ 145,861,000	$ 51,521,000
Proceeds from sales and repayments	$ 60,247,000	$ 15,918,000
Number of investments represented more than ten percentage of aggregate investment portfolio \| Investment	0		0
Investment	$ 0		$ 0
Investments as percentage of total assets	5.00%		5.00%
Investment, Type [Extensible Enumeration]	Pfanstiehl Inc [Member]		Pfanstiehl Inc [Member]
Maximum
Schedule of Investments [Line Items]
Investment maturity period	7 years
Minimum
Schedule of Investments [Line Items]
Investment maturity period	5 years

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