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CONTRACTS AND AGREEMENTS (Details Textual) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Minimum Amount Of Custody,Fund Accounting and Fund Administration Services Payable $ 75,000    
Annual Fee Payable For Transfer Agency Services 20,000    
Brokerage commissions 33,506 31,871 5,718 [1]
Rebalancing Cost 29,562 21,560 357
Creation and Redemption Activity Costs 3,945 9,311 5,361
Percentage Of Average Daily Assets Net Total 0.06% 0.08% 0.09%
Maximum [Member]
      
Transaction fees per transaction 15    
Commission Per Round Turn 15    
Minimum [Member]
      
Annual Fee for custody, fund accounting and fund administration services 75,000    
Transaction fees per transaction 7    
Commission Per Round Turn 7    
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 asset
      
Fee percentage 0.06%    
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 asset | Maximum [Member]
      
Base amount for determining fee percentage 500,000,000    
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
      
Fee percentage 0.0465%    
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 | Maximum [Member]
      
Base amount for determining fee percentage 1,000,000,000    
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 | Minimum [Member]
      
Base amount for determining fee percentage 500,000,000    
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
      
Fee percentage 0.035%    
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 | Minimum [Member]
      
Base amount for determining fee percentage 1,000,000,000    
Marketing Agreement | US12NG's assets up to $3 billion
      
Fee percentage 0.04%    
Base amount for determining fee percentage 3,000,000,000    
Marketing Agreement | US12NG's assets in excess of $3 billion
      
Fee percentage 0.06%    
Base amount for determining fee percentage $ 3,000,000,000    
[1] The commencement of operations of the United States Brent Oil Fund, LP was June 2, 2010.