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Condensed Statement of Changes in Shareholders' Deficit (USD $)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Shareholders’ deficit - opening balance     $ (301,078,135) [1]    
Net gain for the period 1,992,153 (1,067,389) 5,784,379 (619,504)  
Adjustment of redeemable Shares to redemption value     (18,019,604)   (125,134,437)
Shareholders’ deficit - closing balance $ (313,313,360)   $ (313,313,360)   $ (301,078,135) [1]
[1] Derived from audited Statement of Financial Condition as of December 31, 2011.