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Creation and Redemption of Creation Units - Additional Information (Detail)
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3 Months Ended |
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Mar. 31, 2014
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| Creation And Redemption Of Creation Units [Line Items] | |
| Creation Unit, block Shares of a Fund | 50,000 |
| Fixed transaction fee per Creation Unit | 500 |
| Variable transaction fee, percent of the value of the Creation Unit, maximum | 0.10% |
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Volatility Index Fund [Member]
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| Creation And Redemption Of Creation Units [Line Items] | |
| Creation Unit, block Shares of a Fund | 25,000 |