Trading Activities - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2017 USD ($) Contracts	Mar. 31, 2016 USD ($) Contracts
Forward Contracts [Member] | Currencies [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Average notional value of derivative | $	$ 123,410,631	$ 112,147,104
Forward Contracts [Member] | Metals [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Average number of derivative contracts traded	607	1,250
Futures Contracts [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Average number of derivative contracts traded	4,689	8,294