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FAIR VALUE OF FINANCIAL INSTRUMENTS (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Derivatives not Accounted for as Hedging Instruments	Futures - Commodity Contracts
Location of Gain or (Loss) on Derivatives Recognized in Income	Change in unrealized gain (loss) on open positions
Realized Gain or (Loss) on Derivatives Recognized in Income	$ 3,239,910	$ 8,052,950	$ 2,352,020	[1]
Change in Unrealized Gain or (Loss) on Derivatives Recognized in Income	$ 1,655,900	$ (1,239,230)	$ 322,660	[1]
Commodity Contract [Member]
Location of Gain or (Loss) on Derivatives Recognized in Income	Realized gain on closed positions
[1] The commencement of operations of the United States Brent Oil Fund, LP was June 2, 2010.

X

- Definition

The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

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Description of the type of derivative instrument identified. For example, swaps, swaptions, forwards.

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Description of where the net gain (loss) on foreign currency derivatives not designated as hedging instruments are reported in the statement of income or other statement of financial performance.

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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

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