Financial Highlights - Schedule of Financial Highlights (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021	Dec. 31, 2020
Equity [Abstract]
Net asset value at beginning of period			$ 7.10	$ 7.58
Net investment income	$ 0.11	$ 0.11	0.21	0.23
Net change in unrealized depreciation on investments			(0.19)	(0.18)
Realized loss on investments				(0.02)
Net increase in net assets resulting from operations			0.03	0.03
Distributions			(0.25)	(0.29)
Net decrease in net assets			(0.22)	(0.26)
Net asset value at end of period	$ 6.88	$ 7.32	$ 6.88	$ 7.32
Total return based on net asset value			0.37%	0.36%
Net assets at end of period	$ 328,279,441	$ 345,878,834	$ 328,279,441	$ 345,878,834	$ 338,725,057	$ 355,273,630
Units Outstanding at end of period	47,643,333	47,207,438	47,643,333	47,207,438	47,619,327
Ratio/Supplemental data (annualized):
Ratio of net investment income to average net assets			6.12%	6.34%
Ratio of total expenses to average net assets			4.67%	5.10%