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Offering Costs - Additional Information (Detail)
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3 Months Ended |
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Mar. 31, 2015
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| Organization And Offering Costs [Line Items] | |
| Offering costs, amortization period | 12 months |
| Managed Futures Fund [Member] | |
| Organization And Offering Costs [Line Items] | |
| Sponsor reimbursement of organization and offering costs, maximum for each Leveraged Fund | 0.75% |