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CONTRACTS AND AGREEMENTS (Brokerage Commission) (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Brokerage commissions	$ 1,365,114	$ 1,603,540	$ 2,526,521	$ 3,832,708
Commission [Member]
Brokerage commissions			$ 2,526,521	$ 3,832,708
Percentage of average daily net assets	0.18%	0.22%	0.18%	0.22%
Rebalancing Investments Transaction [Member]
Brokerage commissions			$ 2,238,003	$ 3,504,380
Percentage of average daily net assets	88.58%	91.43%	88.58%	91.43%
Creation And Redemption Activity [Member]
Brokerage commissions			$ 288,518	$ 328,328
Percentage of average daily net assets	11.42%	8.57%	11.42%	8.57%

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.

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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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