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QUARTERLY FINANCIAL DATA (Unaudited) (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Total Income (Loss) $ 402,647 $ 7,650,429 $ (10,655,004) $ 7,523,732 $ 3,884,330 $ (2,088,279) $ (41,744) $ 5,087,506 $ 4,921,804 $ 6,841,813 $ 2,678,159 [1]
Total Expenses 135,105 147,750 130,211 146,662 118,576 132,228 146,064 105,026 559,728 501,894 176,843 [1]
Expense Waivers (18,231) (10,169) (10,782) (8,066) 0 (28,525) (32,310) (43,596) (47,248) (104,431) (113,715) [1]
Net expenses 116,874 137,581 119,429 138,596 118,576 103,703 113,754 61,430 512,480 397,463 63,128 [1]
Net income (loss) $ 285,773 $ 7,512,848 $ (10,774,433) $ 7,385,136 $ 3,765,754 $ (2,191,982) $ (155,498) $ 5,026,076 $ 4,409,324 $ 6,444,350 $ 2,615,031 [1]
Net Income (Loss) per Unit 0.75 11.83 (16.93) 11.76 5.29 (5.82) (2.83) 14.82 7.41 11.46 13.08 [1]
[1] The commencement of operations of the United States Brent Oil Fund, LP was June 2, 2010.