Trading Activities - Trading Gains and Losses by Market Sector on Derivative Instruments Traded (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Trading Activity, Gains and Losses, Net [Line Items]
Total trading results	$ (669,822)	$ (981,732)
Derivative [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Total trading results	(669,822)	(981,732)
Derivative [Member] | Commodity [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Total trading results	(2,317,420)	63,203
Derivative [Member] | Equity [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Total trading results	3,943,222	(1,220,921)
Derivative [Member] | Currencies [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Total trading results	(1,406,745)	(441,166)
Derivative [Member] | Interest Rates [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Total trading results	$ (888,879)	$ 617,152