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Contracts And Agreements (Additional Information) (Details) (USD $)
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12 Months Ended |
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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| Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
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| Annual transfer agency services fee |
$ 20,000 |
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| Brokerage commissions |
394,735 |
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314,411 |
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307,461 |
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| Management fee paid to SummerHaven by USCF |
For USCI, the fee is equal to the percentage fees paid to USCF minus 0.14%, with that result multiplied by 0.5, minus 0.06% to arrive at the actual fee paid. For each of CPER, USAG and USMI, the fee is equal to the percentage fees paid to USCF minus 0.18%, with that result multiplied by 0.5, minus 0.6% to arrive at the actual fee paid. |
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| Management fee description |
USCI, CPER, USAG and USMI is contractually obligated to pay USCF a fee, which is paid monthly, equal to 0.95%per annum of average daily total net assets. |
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Licensing Agreements [Member]
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| Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
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| Annual licensing fee |
15,000 |
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| Management fee description |
an annual fee of 0.06% of the average daily total net assets of each Trust Series. |
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United States Commodity Index Fund [Member]
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| Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
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| Brokerage commissions |
390,945 |
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310,109 |
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307,284 |
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| Brokerage commissions as a percentage of average daily net assets |
0.95% |
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United States Commodity Index Fund [Member] | Rebalancing Investments Transaction [Member]
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| Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
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| Brokerage commissions |
376,294 |
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296,759 |
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286,584 |
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| Brokerage commissions as a percentage of average daily net assets |
96.25% |
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95.70% |
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93.26% |
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United States Commodity Index Fund [Member] | Trades Necessitated By Creation And Redemption Activity [Member]
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| Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
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| Brokerage commissions |
14,651 |
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13,350 |
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20,700 |
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| Brokerage commissions as a percentage of average daily net assets |
3.75% |
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4.30% |
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6.74% |
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United States Commodity Index Fund [Member] | Futures Contracts and options on Futures Contracts [Member]
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| Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
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| Brokerage commissions as a percentage of average daily net assets |
0.08% |
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0.07% |
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0.08% |
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United States Copper Index Fund [Member]
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| Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
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| Brokerage commissions |
916 |
[1] |
956 |
[1] |
177 |
[1] |
| Brokerage commissions as a percentage of average daily net assets |
0.65% |
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United States Copper Index Fund [Member] | Rebalancing Investments Transaction [Member]
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| Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
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| Brokerage commissions |
916 |
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799 |
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45 |
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| Brokerage commissions as a percentage of average daily net assets |
100.00% |
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83.58% |
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25.42% |
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United States Copper Index Fund [Member] | Trades Necessitated By Creation And Redemption Activity [Member]
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| Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
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| Brokerage commissions |
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157 |
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132 |
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| Brokerage commissions as a percentage of average daily net assets |
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16.42% |
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74.58% |
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United States Copper Index Fund [Member] | Futures Contracts and options on Futures Contracts [Member]
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| Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
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| Brokerage commissions as a percentage of average daily net assets |
0.04% |
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0.04% |
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0.06% |
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United States Agriculture Index Fund [Member]
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| Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
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| Brokerage commissions |
2,003 |
[2] |
2,632 |
[2] |
0 |
[2] |
| Brokerage commissions as a percentage of average daily net assets |
0.80% |
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United States Agriculture Index Fund [Member] | Rebalancing Investments Transaction [Member]
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| Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
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| Brokerage commissions |
2,003 |
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2,090 |
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| Brokerage commissions as a percentage of average daily net assets |
100.00% |
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79.41% |
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United States Agriculture Index Fund [Member] | Trades Necessitated By Creation And Redemption Activity [Member]
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| Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
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| Brokerage commissions |
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542 |
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| Brokerage commissions as a percentage of average daily net assets |
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20.59% |
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United States Agriculture Index Fund [Member] | Futures Contracts and options on Futures Contracts [Member]
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| Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
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| Brokerage commissions as a percentage of average daily net assets |
0.08% |
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0.12% |
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United States Metals Index Fund [Member]
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| Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
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| Brokerage commissions |
871 |
[3] |
714 |
[3] |
0 |
[3] |
| Brokerage commissions as a percentage of average daily net assets |
0.70% |
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United States Metals Index Fund [Member] | Rebalancing Investments Transaction [Member]
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| Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
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| Brokerage commissions |
774 |
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512 |
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| Brokerage commissions as a percentage of average daily net assets |
88.91% |
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71.71% |
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United States Metals Index Fund [Member] | Trades Necessitated By Creation And Redemption Activity [Member]
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| Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
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| Brokerage commissions |
97 |
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202 |
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| Brokerage commissions as a percentage of average daily net assets |
11.09% |
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28.29% |
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United States Metals Index Fund [Member] | Futures Contracts and options on Futures Contracts [Member]
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| Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
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| Brokerage commissions as a percentage of average daily net assets |
0.03% |
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0.05% |
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Maximum [Member]
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| Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
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| Transaction fees per transaction |
15 |
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| Commissions per round-turn trade, including applicable exchange and NFA fees for Futures Contracts and options on Futures Contracts |
15 |
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Minimum [Member]
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| Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
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| Base amount for determining fee percentage |
75,000 |
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| Transaction fees per transaction |
7 |
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| Commissions per round-turn trade, including applicable exchange and NFA fees for Futures Contracts and options on Futures Contracts |
7 |
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For the first $500 million [Member]
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| Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
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| Fee percentage |
0.06% |
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For the first $500 million [Member] | Maximum [Member]
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| Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
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| Base amount for determining fee percentage |
500,000,000 |
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Combined net assets greater than $500 million but less than $1 billion [Member]
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| Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
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| Fee percentage |
0.0465% |
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Combined net assets greater than $500 million but less than $1 billion [Member] | Maximum [Member]
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| Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
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| Base amount for determining fee percentage |
1,000,000,000 |
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Combined net assets greater than $500 million but less than $1 billion [Member] | Minimum [Member]
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| Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
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| Base amount for determining fee percentage |
500,000,000 |
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Combined net assets exceed $1 billion [Member]
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| Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
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| Fee percentage |
0.035% |
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Combined net assets exceed $1 billion [Member] | Minimum [Member]
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| Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
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| Base amount for determining fee percentage |
1,000,000,000 |
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Marketing Agreement [Member] | On each Trust Series' assets up to 3 billion [Member]
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| Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
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| Fee percentage |
0.06% |
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Marketing Agreement [Member] | On each Trust Series' assets up to 3 billion [Member] | Maximum [Member]
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| Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
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| Base amount for determining fee percentage |
3,000,000,000 |
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Marketing Agreement [Member] | On each Trust Series' assets in excess of $3 billion [Member]
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| Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
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| Fee percentage |
0.04% |
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Marketing Agreement [Member] | On each Trust Series' assets in excess of $3 billion [Member] | Minimum [Member]
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| Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
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| Base amount for determining fee percentage |
$ 3,000,000,000 |
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