XML 23 R18.htm IDEA: XBRL DOCUMENT v2.4.0.6
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) 5,950,000 [1] 11,250,000
Creations (in Shares) 2,550,000 2,100,000
Redemptions (in Shares) (300,000) (7,400,000)
Closing balance (in Shares) 8,200,000 5,950,000 [1]
Redeemable Shares    
Opening balance $ 373,935,765 [1],[2] $ 884,637,847
Creations 172,802,404 167,166,365
Redemptions (17,382,221) (520,261,660)
Adjustment to redemption value (62,411,820) (157,606,787)
Closing balance $ 466,944,128 [2] $ 373,935,765 [1],[2]
Redemption value per Share at period end (in Dollars per share) $ 56.94 $ 62.85
[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 8,200,000 and at December 31, 2011 were 5,950,000.