Trading Activities - Trading Gains and Losses by Market Sector on Derivative Instruments Traded (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Trading Activity, Gains and Losses, Net [Line Items]
Total trading results	$ (574,812)	$ (9,427,157)	$ (1,556,544)	$ (1,328,194)
Derivative [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Total trading results	(574,812)	(9,427,157)	(1,556,544)	(1,328,194)
Derivative [Member] | Commodity [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Total trading results	(979,233)	(5,466,092)	(916,030)	(6,276,242)
Derivative [Member] | Equity [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Total trading results	(2,207,645)	189,855	(3,428,566)	2,017,844
Derivative [Member] | Foreign Currency [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Total trading results	256,808	(575,324)	(184,358)	2,689,244
Derivative [Member] | Interest Rate [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Total trading results	$ 2,355,258	$ (3,575,596)	$ 2,972,410	$ 240,960