Trading Activities - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Average number of futures contracts traded	924	1,373
Average number of commodity forward contracts traded	245	360
Average notional value of currency forward contracts	$ 233,240,803	$ 300,996,370