v2.4.0.8

Agreements - Additional Information (Detail) (USD $) | 3 Months Ended
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Mar. 31, 2014
Health Care Trust Fund [Line Items] |
Percentage of annual NAV as limit to pay SEC registration fees incurred | 0.021%
Ceiling for legal fees | $ 100,000
Ceiling for per annum K-1 preparation and mailing fees against annual NAV | 0.10%
Leverage Fund [Member] |
Health Care Trust Fund [Line Items] |
Management Fee paid to sponsor, percent per annum of the average daily NAV of each Geared Fund | 0.95%
Geared VIX Fund [Member] |
Health Care Trust Fund [Line Items] |
Management Fee paid to sponsor, percent per annum of the average daily NAV of each Geared Fund | 0.95%
Short Euro Fund [Member] |
Health Care Trust Fund [Line Items] |
Management Fee paid to sponsor, percent per annum of the average daily NAV of each Geared Fund | 0.95%
Volatility Index Fund [Member] |
Health Care Trust Fund [Line Items] |
Management Fee paid to sponsor, percent per annum of the average daily NAV of each Geared Fund | 0.85%

X
- Definition Ceiling for fee paid to administrative and legal facilitators. + References No definition available. + Details
Name: | ck0001415311_CeilingForFeePaidToAdministrativeAndLegalFacilitators
Namespace Prefix: | ck0001415311_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Ceiling for preparation and mailing fee of K-1. + References No definition available. + Details
Name: | ck0001415311_CeilingForPreparationAndMailingFee
Namespace Prefix: | ck0001415311_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of annual NAV of fund. + References No definition available. + Details
Name: | ck0001415311_PercentageOfAnnualNavOfFund
Namespace Prefix: | ck0001415311_
Data Type: | num:percentItemType
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_HealthCareTrustFundLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration