XML 21 R17.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) 10,750,000 [1] 8,250,000
Creations (in Shares) 650,000 2,950,000
Redemptions (in Shares) (250,000) (450,000)
Closing balance (in Shares) 11,150,000 10,750,000 [1]
Redeemable Shares    
Opening balance $ 1,677,362,792 [1],[2] $ 1,157,505,203
Creations 108,504,551 466,052,755
Redemptions (41,020,342) (71,329,603)
Adjustments to redemption value 18,019,604 125,134,437
Closing balance $ 1,762,866,605 [2] $ 1,677,362,792 [1],[2]
Redemption value per Share at period end (in Dollars per share) $ 158.10 $ 156.03
[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 11,150,000 and at December 31, 2011 were 10,750,000.