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CONTRACTS AND AGREEMENTS (Brokerage Commission) (Detail) - USD ($) | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Brokerage commissions | $ 694,480 | $ 1,161,407
Commission [Member] |  |
Brokerage commissions | $ 694,480 | $ 1,161,407
Percentage of average daily net assets | 0.14% | 0.16%
Rebalancing Investments Transaction [Member] |  |
Brokerage commissions | $ 575,146 | $ 1,060,043
Percentage of average daily net assets | 82.82% | 91.27%
Creation And Redemption Activity [Member] |  |
Brokerage commissions | $ 119,334 | $ 101,364
Percentage of average daily net assets | 17.18% | 8.73%

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. + Details
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- Details
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- Details
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- Details
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