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Condensed Statement of Changes in Shareholders' Deficit (USD $)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Condensed Statement of Changes in Shareholders' Deficit [Abstract]          
Shareholders’ deficit - opening balance     $ (301,078,135) [1]    
Net gain for the period 4,427,871 9,680,432 10,212,250 9,060,928  
Adjustment of redeemable Shares to redemption value     (211,248,714)   (125,134,437)
Shareholders’ deficit - closing balance $ (502,114,599)   $ (502,114,599)   $ (301,078,135) [1]
[1] Derived from audited Statement of Financial Condition as of December 31, 2011.