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Agreements - Additional Information (Detail) (USD $)
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6 Months Ended | 0 Months Ended | ||||
|---|---|---|---|---|---|---|
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Jun. 30, 2014
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Jun. 30, 2014
Leverage Fund [Member]
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Jun. 30, 2014
Geared VIX Fund [Member]
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Jun. 30, 2014
Short Euro Fund [Member]
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Jun. 30, 2014
Volatility Index Fund [Member]
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Jul. 31, 2014
Matching VIX Funds [Member]
Minimum [Member]
Subsequent Event [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% | 0.95% | 0.95% | 0.85% | ||
| Percentage of annual NAV as limit to pay SEC registration fees incurred | 0.021% | |||||
| Percentage of brokerage commissions on contracts that exceed variable fees collected on average net assets | 0.02% | |||||
| Ceiling for legal fees | $ 100,000 | |||||
| Ceiling for per annum K-1 preparation and mailing fees against annual NAV | 0.10% | |||||