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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 No definition available. + Details
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- Definition Percentage of Average Daily Net Assets + References No definition available. + Details
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- Details
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- Details
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- Details
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