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Fees Paid by Fund and Related Party Transactions - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
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 total net assets 0.60%    
Ongoing Registration Fees and Other Offering Expenses $ 44,044 $ 9,472 $ 9,540
Estimated directors' fees and expenses 14,038 17,340 30,284
Licensing fee incurred 20,192 49,913 37,079
Estimated investor tax reporting cost 150,000 200,000 260,000
US12OF and the Related Public Funds, other than USCI, USAG, CPER and USMI
      
Fees Paid and Related Party Transactions [Line Items]      
Estimated directors' fees and expenses 540,586 607,582 1,107,140
US12OF
      
Fees Paid and Related Party Transactions [Line Items]      
Estimated directors' fees and expenses 25,332 29,439 34,678
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