v2.4.1.9

Offering Costs - Additional Information (Detail) | 3 Months Ended
--- | ---
Mar. 31, 2015
Organization And Offering Costs [Line Items] |
Offering costs, amortization period | 12 months
Managed Futures Fund [Member] |
Organization And Offering Costs [Line Items] |
Sponsor reimbursement of organization and offering costs, maximum for each Leveraged Fund | 0.75%ck0001415311_PercentageOfAverageDailyNavOfFund / us-gaap_InvestmentTypeAxis = ck0001415311_ManagedFuturesFundMember

X
- Definition Offering costs, amortization period, months. + References No definition available. + Details
Name: | ck0001415311_OfferingCostsAmortizationPeriod
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 of fund. + References No definition available. + Details
Name: | ck0001415311_PercentageOfAverageDailyNavOfFund
Namespace Prefix: | ck0001415311_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_InvestmentTypeAxis=ck0001415311_ManagedFuturesFundMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |