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Fair Value of Financial Instruments (Fair Value of Derivative Instrument held by Usci, Cper, Usag and Usmi) (Details) (Commodity Contracts [Member], Futures [Member], Assets [Member], USD $)
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Dec. 31, 2013
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Dec. 31, 2012
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United States Commodity Index Fund [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Derivatives not Accounted for as Hedging Instruments | $ 10,789,747 | $ (5,220,900) |
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United States Copper Index Fund [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Derivatives not Accounted for as Hedging Instruments | 130,163 | 6,575 |
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United States Agriculture Index Fund [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Derivatives not Accounted for as Hedging Instruments | (44,533) | (119,155) |
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United States Metals Index Fund [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Derivatives not Accounted for as Hedging Instruments | $ (46,293) | $ 46,058 |