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Contracts and Agreements (Brokerage Commission) (Detail) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Brokerage commissions | $ 1,094,815 | $ 146,990 | $ 2,282,032 | $ 411,154
Rebalancing Investments Transaction [Member] |  |  |  |
Brokerage commissions |  |  | $ 1,877,665 | $ 240,185
Percentage of average daily net assets | 82.28% | 58.42% | 82.28% | 58.42%
Creation And Redemption Activity [Member] |  |  |  |
Brokerage commissions |  |  | $ 404,367 | $ 170,969
Percentage of average daily net assets | 17.72% | 41.58% | 17.72% | 41.58%
Commission [Member] |  |  |  |
Percentage of average daily net assets | 0.19% | 0.13% | 0.19% | 0.13%

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- 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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