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Derivative Contract Information - Fund's OTC Derivative Assets and Liabilities (Detail) - Over-the-Counter ("OTC") [Member] - Swap Contracts [Member]
$ in Thousands
Jun. 30, 2017
USD ($)
Derivative Instruments and Hedging Activities Disclosures [Line Items]  
Gross Amounts of Assets and Liabilities Presented in the Statement of Financial Condition, Assets $ 0
Gross Amounts of Assets and Liabilities Presented in the Statement of Financial Condition, Liabilities 0
SPDR Long Dollar Gold Trust [Member]  
Derivative Instruments and Hedging Activities Disclosures [Line Items]  
Gross Amounts of Assets and Liabilities Presented in the Statement of Financial Condition, Assets 0
Gross Amounts of Assets and Liabilities Presented in the Statement of Financial Condition, Liabilities $ 0