Trading Activities - Additional Information (Detail)	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($) Contract	Jun. 30, 2018 USD ($) Contract	Jun. 30, 2019 USD ($) Contract	Jun. 30, 2018 USD ($) Contract
Futures Contracts [Member]
Derivative [Line Items]
Average number of derivative contracts traded	3,078	2,967	2,902	3,209
Forward Contracts [Member] | Commodity [Member] | Metals [Member]
Derivative [Line Items]
Average number of derivative contracts traded	354	415	370	420
Forward Contracts [Member] | Currencies [Member]
Derivative [Line Items]
Average notional value of derivative | $	$ 87,358,805	$ 89,299,031	$ 80,738,847	$ 111,022,823