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Offering Costs - Additional Information (Detail)
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6 Months Ended |
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Jun. 30, 2014
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| Organization And Offering Costs [Line Items] | |
| Offering costs, amortization period, months | 12 months |
| Sponsor reimbursement of organization and offering costs, maximum for each Leveraged Fund | 0.85% |
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New Fund [Member]
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| Organization And Offering Costs [Line Items] | |
| Sponsor reimbursement of organization and offering costs, maximum for each Leveraged Fund | 0.95% |