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Contracts and Agreements (Brokerage Commissions) (Details) (USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Long Duration Contracts Assumptions By Product And Guarantee [Line Items] |  |  |  |
Brokerage commissions | $ 1,076 | $ 2,066 | $ 3,592 | $ 8,337
Brokerage commissions as a percentage of average daily net assets | 0.60% |  | 0.60% |
Rebalancing Investments Transaction [Member] |  |  |  |
Long Duration Contracts Assumptions By Product And Guarantee [Line Items] |  |  |  |
Brokerage commissions |  |  | 2,908 | 3,825
Brokerage commissions as a percentage of average daily net assets | 80.96% | 45.88% | 80.96% | 45.88%
Trades Necessitated By Creation And Redemption Activity [Member] |  |  |  |
Long Duration Contracts Assumptions By Product And Guarantee [Line Items] |  |  |  |
Brokerage commissions |  |  | $ 684 | $ 4,512
Brokerage commissions as a percentage of average daily net assets | 19.04% | 54.12% | 19.04% | 54.12%

X
- Definition The amount of expense during the period for floor brokerage fees paid to other broker-dealers to execute trades on their behalf, stock exchange fees, order flow fees, and clearance fees. + References No definition available. + Details
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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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X
- Definition Percentage of Average Daily Net Assets + References No definition available. + Details
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Balance Type: | na
Period Type: | instant