v2.4.0.6

Offering Costs (Detail) | 3 Months Ended
--- | ---
Mar. 31, 2013 M
Organization And Offering Costs [Line Items] |
Offering costs, amortization period, months | 12
Sponsor reimbursement of offering costs, maximum for each Leveraged Fund | 0.85%
New Fund [Member] |
Organization And Offering Costs [Line Items] |
Sponsor reimbursement of offering costs, maximum for each Leveraged Fund | 0.95%

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- Definition Offering Costs, Amortization Period, Months + References No definition available. + Details
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- Details
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Balance Type: | na
Period Type: | duration

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- Definition Percentage OF Average Daily NAV + References No definition available. + Details
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Namespace Prefix: | ck0001415311_
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Balance Type: | na
Period Type: | duration