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Significant Accounting Policies - Gold Payable (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Sep. 30, 2014
Gold Payable    
Gold payable $ 0 $ 140,368 [1]
[1] Represents audited statement of financial condition as of September 30, 2014 prior to adoption of provisions for an investment company for accounting purposes.