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Investment in Gold - Investment in Gold (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
oz
Dec. 31, 2012
oz
Sep. 30, 2013
oz
Ounces of Gold:      
Opening Balance 29,244,400 42,803,600 42,803,600
Creations (excluding gold receivable at December 31, 2013 - 0 and at September 30, 2013 -0) 656,000   4,944,800
Redemptions (excluding gold payable at December 31, 2013 - 192.9 and at September 30, 2013 - 115.9) (4,013,900)   (18,348,000)
Sales of gold (30,000)   (156,000)
Closing Balance 25,856,500   29,244,400
Investment in Gold (lower of cost or market):      
Opening Balance $ 35,812,777 [1] $ 50,726,261 $ 50,726,261
Creations (excluding gold receivable at December 31, 2013 - $0 and at September 30, 2013 - $0) 827,161   7,734,465
Redemptions (excluding gold payable at December 31, 2013 - $231,752 and at September 30, 2013 - $153,680) (4,933,266)   (22,459,232)
Sales of gold (36,789) (50,126) (188,717)
Unrealized loss on investment in gold (603,341) 0 0
Closing Balance $ 31,066,542 [1]   $ 35,812,777 [1]
[1] The cost of Investment in Gold at December 31, 2013 is $31,669,883 and at September 30, 2013, the market value of Investment in Gold was $38,792,631.