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Organization - Additional Information (Detail) (USD $)
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0 Months Ended | 5 Months Ended | 9 Months Ended |
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Oct. 09, 2007
ShareSeries
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Jun. 03, 2014
ShareSeries
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Sep. 30, 2014
ShareSeries
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| Organization, Consolidation and Presentation of Financial Statements [Abstract] | |||
| Number of series of Trust | 22 | 21 | 21 |
| Aggregate purchase of each Leveraged Fund | $ 200 | $ 200 |