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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.

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