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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) 2,100,000 [1] 1,900,000
Creations (in Shares) 50,000 1,450,000
Redemptions (in Shares) (150,000) (1,250,000)
Closing balance (in Shares) 2,000,000 2,100,000 [1]
Redeemable Shares    
Opening balance $ 182,586,013 [1],[2] $ 166,379,066
Creations 4,726,778 143,112,185
Redemptions (13,643,436) (120,762,519)
Adjustments to redemption value (1,584,354) (6,142,719)
Closing balance $ 172,085,001 [2] $ 182,586,013 [1],[2]
Redemption value per Share at period end (in Dollars per share) $ 86.04 $ 86.95
[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 2,000,000 and at December 31, 2011 were 2,100,000.