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Redeemable Capital Shares - Schedule for Redeemable Capital Shares Activity (Detail) - USD ($)
 2 Months Ended 12 Months Ended
Dec. 31, 2018
Oct. 31, 2018
Oct. 31, 2017
Temporary Equity Disclosure [Abstract]      
Opening Balance, Shares 1,700,000 1,850,000 2,350,000
Shares Issued, Shares 100,000 250,000 450,000
Shares Redeemed, Shares (150,000) (400,000) (950,000)
Ending Balance, Shares 1,650,000 1,700,000 1,850,000
Opening Balance, Amount $ 120,594,430 $ 141,941,827 $ 178,918,567
Shares Issued, Amount 7,287,860 18,880,911 34,369,885
Shares Redeemed, Amount (10,854,234) (30,200,732) (72,530,089)
Adjustment to period Shares due to currency movement (779,086) (10,027,576) 1,183,464
Ending Balance, Amount $ 116,248,970 $ 120,594,430 $ 141,941,827