Service Providers and Related Party Agreements - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Related Party Transaction [Line Items]
Management fee percentage per annum of daily NAV	0.75%
Managing owner waived fees	$ 11,215	$ 7,201
Managing Owner
Related Party Transaction [Line Items]
Fee waiver terms	The Managing Owner has contractually agreed to waive indefinitely the fees that it receives in an amount equal to the indirect management fees that the Fund incurs through its investments in affiliated money market mutual funds and/or affiliated T-Bill ETFs. The Managing Owner may terminate this fee waiver on 60 days notice.
Fee waiver termination notice period	60 days