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CONTRACTS AND AGREEMENTS (Details Textual) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Description Of Marketing Agent Fee     The fee of the Marketing Agent, which is borne by USCF, is equal to 0.06% on USBO''''s assets up to $3 billion and 0.04% on USBO''''s assets in excess of $3 billion.  
Minimum Amount Of Custody,Fund Accounting and Fund Administration Services Payable     $ 75,000  
Annual Fee Payable For Transfer Agency Services     20,000  
Description Of Comibined Net Asset Based Charges     (a) 0.06% for the first $500 million of USBO''''s, USOF''''s, USNG''''s, US12OF''''s, UGA''''s, USDHO''''s, USSO''''s, US12NG''''s, USCI''''s, CPER''''s, USAG''''s and USMI''''s combined net assets, (b) 0.0465% for USBO''''s, USOF''''s, USNG''''s, US12OF''''s, UGA''''s, USDHO''''s, USSO''''s, US12NG''''s, USCI''''s, CPER''''s, USAG''''s and USMI''''s combined net assets greater than $500 million but less than $1 billion, and (c) 0.035% once USBO''''s, USOF''''s, USNG''''s, US12OF''''s, UGA''''s, USDHO''''s, USSO''''s, US12NG''''s, USCI''''s, CPER''''s, USAG''''s and USMI''''s combined net assets exceed $1 billion. The annual minimum amount will not apply if the asset-based charge for all accounts in the aggregate exceeds $75,000. USCF also pays transaction fees ranging from $7 to $15 per transaction.  
Minimum Transaction Fees Payable     7  
Maximum Transaction Fees Payable     15  
Commission Per Round Turn     7 15
Brokerage commissions 8,739 7,456 25,880 20,896
Rebalancing Cost     17,220 12,206
Creation and Redemption Activity Costs     $ 8,660 $ 8,690
Percentage Of Average Daily Assets Net Total     0.06% 0.07%