v2.4.0.8

Offering Costs - Additional Information (Detail) | 3 Months Ended
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Mar. 31, 2014
Organization And Offering Costs [Line Items] |
Offering costs, amortization period, months | 12 months
Sponsor reimbursement of organization and offering costs, maximum for each Leveraged Fund | 0.85%
New Fund [Member] |
Organization And Offering Costs [Line Items] |
Sponsor reimbursement of organization and offering costs, maximum for each Leveraged Fund | 0.95%

X
- Definition Offering costs, amortization period, months. + References No definition available. + Details
Name: | ck0001415311_OfferingCostsAmortizationPeriodMonths
Namespace Prefix: | ck0001415311_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ck0001415311_OrganizationAndOfferingCostsLineItems
Namespace Prefix: | ck0001415311_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of average daily NAV. + References No definition available. + Details
Name: | ck0001415311_PercentageOfAverageDailyNav
Namespace Prefix: | ck0001415311_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration