Trading Activities - Additional Information (Detail)	3 Months Ended		6 Months Ended
	Jun. 30, 2016 USD ($) Contracts	Jun. 30, 2015 USD ($) Contracts	Jun. 30, 2016 USD ($) Contracts	Jun. 30, 2015 USD ($) Contracts
Foreign Exchange Forward [Member]
Derivative [Line Items]
Average notional value of derivative | $	$ 118,755,428	$ 137,214,414	$ 115,451,266	$ 135,302,544
Futures Contracts [Member]
Derivative [Line Items]
Average number of derivative contracts held	5,781	7,761	7,038	8,095
Options Purchased [Member]
Derivative [Line Items]
Average number of derivative contracts traded	1,168	1,305	1,209	1,175