Fair Value Measurements - Derivative Instruments Priced at Fair Value Using Unobservable Inputs (Detail) - USD ($)	Jun. 30, 2016	Dec. 31, 2015
Assets
Total assets	$ 21,934,173	$ 60,493,287
Liabilities
Total liabilities	3,655,705	3,556,814
Forward Contracts [Member]
Assets
Total assets	2,096,970	1,168,919
Liabilities
Total liabilities	2,434,951	1,125,088
U.S. Treasury Bills [Member]
Assets
Total assets	15,997,324	55,493,206
Futures Contracts [Member]
Assets
Total assets	3,839,879	3,831,162
Liabilities
Total liabilities	1,220,754	2,431,726
Level 1 [Member]
Assets
Total assets	4,480,193	4,572,104
Liabilities
Total liabilities	2,690,448	3,386,514
Level 1 [Member] | Forward Contracts [Member]
Assets
Total assets	640,314	740,942
Liabilities
Total liabilities	1,469,694	954,788
Level 1 [Member] | Futures Contracts [Member]
Assets
Total assets	3,839,879	3,831,162
Liabilities
Total liabilities	1,220,754	2,431,726
Level 2 [Member]
Assets
Total assets	17,453,980	55,921,183
Liabilities
Total liabilities	965,257	170,300
Level 2 [Member] | Forward Contracts [Member]
Assets
Total assets	1,456,656	427,977
Liabilities
Total liabilities	965,257	170,300
Level 2 [Member] | U.S. Treasury Bills [Member]
Assets
Total assets	$ 15,997,324	$ 55,493,206