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Statements of Changes in Shareholders' Deficit (USD $)
 4 Months Ended 12 Months Ended
Dec. 31, 2009
Dec. 31, 2011
Dec. 31, 2010
Shareholders’ deficit - opening balance $ 0 [1] $ (186,816,986) $ (8,648,370) [1]
Net gain/(loss) for the year 1,273,268 [1] 10,873,288 (1,791,997)
Adjustment of redeemable Shares to redemption value (9,921,638) [1] (125,134,437) (176,376,619)
Shareholders’ deficit – closing balance $ (8,648,370) [1] $ (301,078,135) $ (186,816,986)
[1] Date of Inception.