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CONTRACTS AND AGREEMENTS (Brokerage Commission) (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Brokerage commissions	$ 4,675,687	$ 6,875,314	$ 5,196,820
Commission [Member]
Brokerage commissions	$ 4,675,687	$ 6,875,314	$ 5,196,820
Percentage of average daily net assets	0.18%	0.20%	0.20%
Rebalancing Investments Transaction [Member]
Brokerage commissions	$ 4,112,340	$ 6,297,055	$ 4,288,005
Percentage of average daily net assets	87.95%	91.59%	82.51%
Creation And Redemption Activity [Member]
Brokerage commissions	$ 563,347	$ 578,259	$ 908,815
Percentage of average daily net assets	12.05%	8.41%	17.49%

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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