Trading Activities - Trading Gains and Losses by Market Sector on Derivative Instruments Traded (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Trading Activity, Gains and Losses, Net [Line Items]
Total trading results	$ (3,092,710)	$ 1,656,125	$ (4,649,254)	$ 327,931
Derivative [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Total trading results	(3,092,710)	1,656,125	(4,649,254)	327,931
Derivative [Member] | Commodity [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Total trading results	(2,877,622)	2,165,636	(3,793,652)	(4,110,606)
Derivative [Member] | Equity [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Total trading results	1,259,997	(3,442,268)	(2,168,569)	(1,424,424)
Derivative [Member] | Currencies [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Total trading results	(643,880)	482,957	(828,238)	3,172,201
Derivative [Member] | Interest Rates [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Total trading results	$ (831,205)	$ 2,449,800	$ 2,141,205	$ 2,690,760