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CONTRACTS AND AGREEMENTS (Brokerage Commission) (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Brokerage commissions	$ 2,538,611	$ 4,675,687	$ 6,875,314
Commission [Member]
Brokerage commissions	$ 2,538,611	$ 4,675,687	$ 6,875,314
Percentage of average daily net assets	0.14%	0.18%	0.20%
Rebalancing Investments Transaction [Member]
Brokerage commissions	$ 2,145,268	$ 4,112,340	$ 6,297,055
Percentage of average daily net assets	84.51%	87.95%	91.59%
Creation And Redemption Activity [Member]
Brokerage commissions	$ 393,343	$ 563,347	$ 578,259
Percentage of average daily net assets	15.49%	12.05%	8.41%

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

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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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