Service Providers and Related Party Agreements - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Related Party Transaction [Line Items]
Management fee percentage per annum of daily net asset			0.75%
Management Fees	$ 609,375	$ 410,476	$ 1,089,155	$ 724,372
Management Fees payable	225,981		225,981		171,407
Brokerage fees	22,375	21,119	32,566	39,674
Brokerage fees payable	2,892		2,892		5,372
Fund asset held by administrator	0		0		0
Deutsche Bank Securities Inc [Member]
Related Party Transaction [Line Items]
Brokerage fees	22,375	21,119	32,566	39,674
Brokerage fees payable	$ 2,892		$ 2,892		$ 5,372