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Related Parties - Sponsor, Trustee, Custodian and Marketing Agent Fees - Amounts Payable to Related Parties (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Sep. 30, 2013
Amounts Payable to Related Parties    
Accounts payable to related parties $ 9,941 $ 12,133 [1]
Custodian [Member]
   
Amounts Payable to Related Parties    
Accounts payable to related parties 1,809 2,190
Trustee [Member]
   
Amounts Payable to Related Parties    
Accounts payable to related parties 164 165
Sponsor [Member]
   
Amounts Payable to Related Parties    
Accounts payable to related parties 3,984 4,889
Marketing Agent [Member]
   
Amounts Payable to Related Parties    
Accounts payable to related parties $ 3,984 $ 4,889
[1] Derived from audited statement of financial condition as of September 30, 2013.