Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) - USD ($)	Jun. 30, 2015	Dec. 31, 2014
Assets
Investments in U.S. Treasury bills		$ 5,792,535
Liabilities
Net Fair Value	$ 74,791,367
U.S. Treasury Bills [Member]
Assets
Investments in U.S. Treasury bills	77,949,255
Fair Value, Measurements, Recurring [Member]
Assets
Futures	3,530,627	7,228,527
Forwards	2,181,285	2,346,025
Total Assets	83,661,167	9,574,552
Liabilities
Futures	5,123,351	1,519,724
Forwards	2,970,049	1,592,346
Total Liabilities	8,093,400	3,112,070
Unrealized currency loss	(776,400)	(669,947)
Net Fair Value	74,791,367	5,792,535
Fair Value, Measurements, Recurring [Member] | U.S. Treasury Bills [Member]
Assets
Investments in U.S. Treasury bills	77,949,255
(Level 1) [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Futures	3,530,627	7,228,527
Forwards	1,719,997	1,699,736
Total Assets	5,250,624	8,928,263
Liabilities
Futures	5,123,351	1,519,724
Forwards	2,640,308	1,441,911
Total Liabilities	7,763,659	2,961,635
Net Fair Value	(2,513,035)	5,966,628
(Level 2) [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Forwards	461,288	646,289
Total Assets	78,410,543	646,289
Liabilities
Forwards	329,741	150,435
Total Liabilities	329,741	150,435
Net Fair Value	78,080,802	$ 495,854
(Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | U.S. Treasury Bills [Member]
Assets
Investments in U.S. Treasury bills	$ 77,949,255