Service Providers and Related Party Agreements - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Related Party Transaction [Line Items]
Management fee percentage per annum of daily NAV	0.85%
Managing owner waived fees	$ 208,557	$ 178,500
Managing Owner
Related Party Transaction [Line Items]
Fee waiver termination notice period	60 days