Income Taxes - Additional Information (Details) $ in Thousands	9 Months Ended			12 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2023 USD ($) Investment	Dec. 31, 2022 USD ($) Investment	Dec. 31, 2021 USD ($) Investment
Tax Credit Carryforward [Line Items]
Increase (decrease) in distributable earnings	$ 1,900	$ 2,300	$ 100
Increase (decrease) in additional paid in capital	1,900	2,300	100
Deferred tax liability pertaining to unrealized gains on investment	2,800	3,300	2,800	$ 2,800	$ 3,300	$ 2,800
Current tax expense				100
Deferred tax benefit				$ 600
Number of investment | Investment				7	5	6
Deferred tax asset	900	800	900	$ 900	$ 800	$ 900
Tax refund from operating loss carryback to previous tax years						300
Tax cost of investments	$ 3,256,630	$ 2,787,005	$ 2,445,863	3,256,630	2,787,005	2,445,863
Estimated gross unrealized gains on tax cost investment				159,281	109,609	156,819
Estimated gross unrealized loss on tax cost investment				135,606	105,786	79,599
Net expense for federal excise tax				$ 2,300	$ 2,200	$ 700