Additional Valuation Information - Summary of the Tiered Valuation Input Levels (Detail) - USD ($)	Jun. 30, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
United States Treasury Obligations	$ 40,963,943	$ 30,970,236
Money Market Mutual Fund	2,504,620	1,502,575
Total Investments, at value (cost $43,465,491 and $32,473,872, respectively)	43,468,563	32,472,811
Currency Futures Contracts	642,855	112,424
Total Investments	44,111,418	32,585,235
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money Market Mutual Fund	2,504,620	1,502,575
Total Investments, at value (cost $43,465,491 and $32,473,872, respectively)	2,504,620	1,502,575
Currency Futures Contracts	642,855	112,424
Total Investments	3,147,475	1,614,999
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
United States Treasury Obligations	40,963,943	30,970,236
Total Investments, at value (cost $43,465,491 and $32,473,872, respectively)	40,963,943	30,970,236
Total Investments	$ 40,963,943	$ 30,970,236