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CONTRACTS AND AGREEMENTS (Brokerage Commission) (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Brokerage commissions	$ 652,149	$ 1,365,114	$ 1,346,629	$ 2,526,521
Commission [Member]
Brokerage commissions			$ 1,346,629	$ 2,526,521
Percentage of average daily net assets	0.14%	0.18%	0.14%	0.18%
Rebalancing Investments Transaction [Member]
Brokerage commissions			$ 1,151,426	$ 2,238,003
Percentage of average daily net assets	85.50%	88.58%	85.50%	88.58%
Creation And Redemption Activity [Member]
Brokerage commissions			$ 195,203	$ 288,518
Percentage of average daily net assets	14.50%	11.42%	14.50%	11.42%

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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