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ORGANIZATION AND BUSINESS (Details Textual) (USD $)
 1 Months Ended 9 Months Ended 27 Months Ended
Feb. 29, 2012
Jun. 02, 2010
Sep. 30, 2013
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Dec. 31, 2011
May 31, 2010
Units Issued During Period To Authorized Purchasers Through Distributors 50,000              
Units Issued During Period To Authorized Purchasers Through Marketing Agent 100,000              
Transaction Fee       $ 350        
Initially Registered Units Of Entity With Sec               50,000,000
Net asset value per unit   $ 50.00 $ 42.39 $ 42.39 $ 40.98 [1],[2],[3] $ 40.60 [1] $ 37.27 [1]  
Initial stock units issued   200,000 450,000          
Initial Stock Units Outstanding     450,000          
Initial Units Value, Issued   10,000,000            
Total Units Registered Of Entity     45,450,000 45,450,000        
Maximum [Member]
                
Initial stock units issued     900,000          
Initial Stock Units Outstanding     900,000          
Minimum [Member]
                
Net asset value per unit     $ 44.96 $ 44.96        
Prior to July 1, 2011 [Member]
                
Transaction Fee     $ 1,000          
Open Futures Contracts - Long [Member] | United States [Member] | ICE Brent Crude Oil Futures CO August 2013 contracts, expiring July
                
Number of Contracts     333 [4] 333 [4]        
[1] On August 26, 2013, USBO executed a 2-for-1 forward unit split for all unitholders of record as of the close of markets on August 26, 2013. The 2-for-1 forward unit split was payable after the close of markets on August 28, 2013. USBO began trading at its post split price on August 29, 2013. The Financial Highlights (Unaudited) have been adjusted for the periods shown to reflect the 2-for-1 forward unit split on a retroactive basis.
[2] On August 26, 2013, the United States Brent Oil Fund, LP executed a 2-for-1 forward unit split for all unitholders of record as of the close of markets on August 26, 2013. The 2-for-1 forward unit split was payable after the close of markets on August 28, 2013. United States Brent Oil Fund, LP began trading its post-unit split price on August 29, 2013. Historical units outstanding, net asset value per unit and market value per unit have been adjusted to reflect the 2-for-1 forward unit split on a retroactive basis.
[3] On August 26, 2013, the United States Brent Oil Fund, LP executed a 2-for-1 forward unit split for all unitholders of record as of the close of markets on August 26, 2013. The 2-for-1 forward unit split was payable after the close of markets on August 28, 2013. United States Brent Oil Fund, LP began trading at its post split price on August 29, 2013. The Condensed Statement of Changes in Partners’ Capital (Unaudited) has been adjusted for the period to reflect the 2-for-1 forward unit split on a retroactive basis.
[4] Collateral amounted to $3,989,981 on open futures contracts.