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Significant accounting policies - Creations and Redemptions of Shares (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Number of Redeemable Shares:    
Opening Balance 301,600,000 437,900,000
Creations 6,800,000 51,100,000
Redemptions (42,400,000) (187,400,000)
Closing Balance 266,000,000 301,600,000
Redeemable Shares:    
Opening Balance $ 38,623,537 [1] $ 75,389,813
Creations 827,161 7,734,465
Redemptions (5,147,245) (26,693,165)
Adjustment to redemption value (3,481,408) (17,807,576)
Closing Balance $ 30,822,045 [1] $ 38,623,537 [1]
Redemption Value per Redeemable Share at Period End $ 115.87 $ 128.06
[1] Authorized share capital is unlimited and the par value of the Shares is $0.00. Shares issued and outstanding at December 31, 2013 was 266,000,000 and at September 30, 2013 was 301,600,000.