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Financial Instruments, Off-Balance Sheet Risks and Contingencies (Additional Information) (Details) (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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| Carrying Amounts and Fair Values of Financial Instruments or Liabilities [Line Items] | ||
| Cash deposits and investments in Treasuries | $ 494,440,076 | $ 491,119,704 |
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United States Copper Index Fund [Member]
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| Carrying Amounts and Fair Values of Financial Instruments or Liabilities [Line Items] | ||
| Cash deposits and investments in Treasuries | 2,166,695 | 2,541,590 |
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United States Agriculture Index Fund [Member]
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| Carrying Amounts and Fair Values of Financial Instruments or Liabilities [Line Items] | ||
| Cash deposits and investments in Treasuries | 2,328,626 | 2,679,845 |
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United States Metals Index Fund [Member]
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| Carrying Amounts and Fair Values of Financial Instruments or Liabilities [Line Items] | ||
| Cash deposits and investments in Treasuries | $ 2,248,304 | $ 2,605,049 |