Derivatives and Hedging - Offsetting Liabilities (Detail) - USD ($)	Jun. 30, 2015	Dec. 31, 2014
Offsetting of Derivative Liabilities [Line Items]
Gross Amounts Recognized	$ (1,925,910)	$ (1,116,103)
Gross Amounts Offset in the Statements of Financial Condition	1,310,970	1,116,103
Net Amounts Presented in the Statements of Financial Condition	(614,940)
Financial Instruments, Liabilities	0	0
Cash Collateral Received/Pledged, Liabilities	0	0
Net Amount, Liabilities	(614,940)
Unrealized Currency Loss	(2,390,628)	(2,400,799)
Total net unrealized loss on open contracts	(3,005,568)	(1,107,556)
Total net unrealized loss on open contracts	11,964,197	(1,107,556)
Unrealized currency loss, amounts not offset	(2,390,628)	(2,400,799)
Total net unrealized loss on open contracts, amounts not offset	(3,005,568)	(1,107,556)
Future Contracts [Member]
Offsetting of Derivative Liabilities [Line Items]
Gross Amounts Recognized	(580,693)	(134,615)
Gross Amounts Offset in the Statements of Financial Condition	224,047	134,615
Net Amounts Presented in the Statements of Financial Condition	(356,646)
Financial Instruments, Liabilities	0	0
Cash Collateral Received/Pledged, Liabilities	0	0
Net Amount, Liabilities	(356,646)
Total net unrealized loss on open contracts	(614,940)	1,293,243
Forward Contracts [Member]
Offsetting of Derivative Liabilities [Line Items]
Gross Amounts Recognized	(1,345,217)	(981,488)
Gross Amounts Offset in the Statements of Financial Condition	1,086,923	981,488
Net Amounts Presented in the Statements of Financial Condition	(258,294)
Financial Instruments, Liabilities	0	0
Cash Collateral Received/Pledged, Liabilities	0	$ 0
Net Amount, Liabilities	$ (258,294)