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Significant Accounting Policies (Detail) - Schedule of Redeemable Capital Shares (USD $)
 6 Months Ended 12 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Number of redeemable Shares    
Opening balance (in Shares) 19,100,000 [1] 16,700,000
Creations (in Shares) 800,000 8,900,000
Redemptions (in Shares) (2,100,000) (6,500,000)
Closing balance (in Shares) 17,800,000 19,100,000 [1]
Redeemable Shares    
Opening balance $ 534,304,845 [1],[2] $ 509,311,012
Creations 24,396,727 342,215,198
Redemptions (61,435,552) (238,992,879)
Adjustment to redemption value (19,478,763) (78,228,486)
Closing balance $ 477,787,257 [2] $ 534,304,845 [1],[2]
Redemption value per Share at period end (in Dollars per share) $ 26.84 $ 27.97
[1] Derived from audited Statement of Financial Condition as of December 31, 2011.
[2] Authorized share capital is unlimited with no par value per share. Shares issued and outstanding at June 30, 2012 were 17,800,000 and at December 31, 2011 were 19,100,000.