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Agreements - Additional Information (Detail) (USD $)
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3 Months Ended |
|---|---|
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Mar. 31, 2014
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| Health Care Trust Fund [Line Items] | |
| Percentage of annual NAV as limit to pay SEC registration fees incurred | 0.021% |
| Ceiling for legal fees | $ 100,000 |
| Ceiling for per annum K-1 preparation and mailing fees against annual NAV | 0.10% |
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Leverage Fund [Member]
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| Health Care Trust Fund [Line Items] | |
| Management Fee paid to sponsor, percent per annum of the average daily NAV of each Geared Fund | 0.95% |
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Geared VIX Fund [Member]
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| Health Care Trust Fund [Line Items] | |
| Management Fee paid to sponsor, percent per annum of the average daily NAV of each Geared Fund | 0.95% |
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Short Euro Fund [Member]
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| Health Care Trust Fund [Line Items] | |
| Management Fee paid to sponsor, percent per annum of the average daily NAV of each Geared Fund | 0.95% |
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Volatility Index Fund [Member]
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| Health Care Trust Fund [Line Items] | |
| Management Fee paid to sponsor, percent per annum of the average daily NAV of each Geared Fund | 0.85% |