Summary of Significant Accounting Policies - Summary of Gross and Net Amounts of Offsetting Assets and Liabilities (Detail) - Commodity Currency Contract [Member] - USD ($)	Dec. 31, 2016	Dec. 31, 2015
Offsetting Assets And Liabilities [Line Items]
Gross Amounts of Recognized Assets	$ 134,300	$ 238,350
Gross Amounts Offset Assets in the Statement of Financial Condition		(238,350)
Net Amounts of Assets Presented in the Statement of Financial Condition	134,300
Assets Net Amount	$ 134,300
Gross Amounts of Recognized Liabilities		(394,359)
Gross Amounts Offset Liabilities in the Statement of Financial Condition		238,350
Net Amounts of Liabilities Presented in the Statement of Financial Condition		(156,009)
Gross Amounts Not Offset In The Statement of Financial Condition - Financial Instruments Liabilities		$ 156,009