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Fees Paid by Fund and Related Party Transactions - Additional Information (Detail) (USD $)
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Fees Paid and Related Party Transactions [Line Items]    
USCF Management Fee US12OF is contractually obligated to pay USCF a fee, which is paid monthly, equal to 0.60% per annum of average daily total net assets.  
Percentage of average daily net assets 0.60%  
Ongoing Registration Fees and Other Offering Expenses $ 4,732 $ 4,688
Licensing fee incurred 11,577 28,471
Future Period - for the year ending December 31, 2012
    
Fees Paid and Related Party Transactions [Line Items]    
Estimated directors' fees and expenses 540,000  
Estimated investor tax reporting cost 200,000  
Licensing Agreements | First $1,000,000,000 of combined net assets of the funds
    
Fees Paid and Related Party Transactions [Line Items]    
Fee percentage 0.04%  
Licensing Agreements | First $1,000,000,000 of combined net assets of the funds | Maximum
    
Fees Paid and Related Party Transactions [Line Items]    
Combined assets basis for determining fee percentage 1,000,000,000  
Licensing Agreements | Combined net assets above $1,000,000,000
    
Fees Paid and Related Party Transactions [Line Items]    
Fee percentage 0.02%  
Licensing Agreements | Combined net assets above $1,000,000,000 | Minimum
    
Fees Paid and Related Party Transactions [Line Items]    
Combined assets basis for determining fee percentage $ 1,000,000,000  
Licensing Agreements | On and after October 20, 2011
    
Fees Paid and Related Party Transactions [Line Items]    
Fee percentage 0.015%  
Assets basis for determining fee percentage On all net assets