Summary of Significant Accounting Policies - Summary of Gross and Net Amounts of Offsetting Liabilities (Detail) - Currency Futures Contracts [Member] - USD ($)	Mar. 31, 2017	Dec. 31, 2016
Offsetting Assets And Liabilities [Line Items]
Gross Amounts of Recognized Assets	$ 13,344,919	$ 1,988,810
Gross Amounts Offset Assets in the Statement of Financial Condition	(10,539,511)	(1,988,810)
Net Amounts of Assets Presented in the Statement of Financial Condition	2,805,408
Assets Net Amount	2,805,408
Gross Amounts of Recognized Liabilities	(10,539,511)	(5,503,560)
Gross Amounts Offset Liabilities in the Statement of Financial Condition	$ 10,539,511	1,988,810
Net Amounts of Liabilities Presented in the Statement of Financial Condition		(3,514,750)
Gross Amounts Not Offset in the Statement of Financial Condition - Financial Instruments Liabilities		$ 3,514,750