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CONTRACTS AND AGREEMENTS (Brokerage Commission) (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Brokerage commissions	$ 570,108	$ 1,248,593	$ 1,916,737	$ 3,775,114
Commission [Member]
Brokerage commissions			$ 1,916,737	$ 3,775,114
Percentage of average daily net assets	0.14%	0.18%	0.14%	0.18%
Rebalancing Investments Transaction [Member]
Brokerage commissions			$ 1,651,071	$ 3,311,727
Percentage of average daily net assets	86.14%	87.73%	86.14%	87.73%
Creation And Redemption Activity [Member]
Brokerage commissions			$ 265,666	$ 463,387
Percentage of average daily net assets	13.86%	12.27%	13.86%	12.27%

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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