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Investment in Gold - Investment in Gold (Parenthetical) (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
oz
Sep. 30, 2013
oz
Investment in Gold [Line Items]    
Gold receivable, Ounces of gold 182,900 0
Gold payable, Ounces of gold 0 115,900
Gold receivable $ 240,490 $ 0
Gold payable $ 0 $ 153,680 [1]
[1] Derived from audited statement of financial condition as of September 30, 2013.