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Organization And Business (Additional Information) (Details)
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Dec. 31, 2013
United States Commodity Index Fund [Member]
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May 01, 2012
United States Commodity Index Fund [Member]
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Jul. 01, 2011
United States Commodity Index Fund [Member]
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Aug. 10, 2010
United States Commodity Index Fund [Member]
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Aug. 10, 2010
United States Commodity Index Fund [Member]
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May 01, 2012
United States Commodity Index Fund [Member]
Creation Baskets [Member]
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May 01, 2012
United States Commodity Index Fund [Member]
Marketing Agent [Member]
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Dec. 31, 2013
United States Copper Index Fund [Member]
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May 01, 2012
United States Copper Index Fund [Member]
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Nov. 15, 2011
United States Copper Index Fund [Member]
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Nov. 15, 2011
United States Copper Index Fund [Member]
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May 01, 2012
United States Copper Index Fund [Member]
Creation Baskets [Member]
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May 01, 2012
United States Copper Index Fund [Member]
Marketing Agent [Member]
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Dec. 31, 2013
United States Agriculture Index Fund [Member]
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May 01, 2012
United States Agriculture Index Fund [Member]
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Apr. 13, 2012
United States Agriculture Index Fund [Member]
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Apr. 13, 2012
United States Agriculture Index Fund [Member]
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May 01, 2012
United States Agriculture Index Fund [Member]
Creation Baskets [Member]
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May 01, 2012
United States Agriculture Index Fund [Member]
Marketing Agent [Member]
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Dec. 31, 2013
United States Metals Index Fund [Member]
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Jun. 19, 2012
United States Metals Index Fund [Member]
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Jun. 09, 2012
United States Metals Index Fund [Member]
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May 01, 2012
United States Metals Index Fund [Member]
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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] | |||||||||||||||||||||||
| Number of Units per basket | 50,000 | 50,000 | 100,000 | 50,000 | 50,000 | 100,000 | 50,000 | 50,000 | 100,000 | ||||||||||||||
| Fee paid by Authorized Purchasers for each order placed to create one or more Creation Baskets or to redeem one or more baskets | 350 | 1,000 | 1,000 | 1,000 | 350 | 1,000 | 1,000 | 1,000 | 350 | 1,000 | 1,000 | 1,000 | 350 | 350 | 350 | 1,000 |