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Contracts and Agreements (Brokerage Commission) (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Brokerage commissions	$ 1,094,815	$ 146,990	$ 2,282,032	$ 411,154
Rebalancing Investments Transaction [Member]
Brokerage commissions			$ 1,877,665	$ 240,185
Percentage of average daily net assets	82.28%	58.42%	82.28%	58.42%
Creation And Redemption Activity [Member]
Brokerage commissions			$ 404,367	$ 170,969
Percentage of average daily net assets	17.72%	41.58%	17.72%	41.58%
Commission [Member]
Percentage of average daily net assets	0.19%	0.13%	0.19%	0.13%

X

- Definition

The amount of expense during the period for floor brokerage fees paid to other broker-dealers to execute trades on their behalf, stock exchange fees, order flow fees, and clearance fees.

+ References

No definition available.

+ Details

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X

- Definition

Percentage of Average Daily Net Assets

+ References

No definition available.

+ Details

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X

- Details

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X

- Details

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X

- Details

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