Organization - Additional Information (Detail)		6 Months Ended
	Feb. 23, 2015 USD ($) shares	Jun. 30, 2017 Basket shares	Dec. 31, 2016 shares	Oct. 24, 2014 Trust
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Number of series of trusts | Trust				2
Purchase agreement transaction date		Feb. 23, 2015
Partners' capital contribution | $	$ 1,000
General shares, shares issued	40	40	40
Maximum remaining maturity of T-Bill ETFs		12 months
Minimum number of Baskets that can be purchased | Basket		1
Number of shares issued per basket		200,000