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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
Sep. 30, 2013
Sep. 30, 2012
Amounts Payable to Related Parties    
Accounts payable to related parties $ 12,133 $ 22,038
Custodian [Member]
   
Amounts Payable to Related Parties    
Accounts payable to related parties 2,190 3,908
Trustee [Member]
   
Amounts Payable to Related Parties    
Accounts payable to related parties 165 164
Sponsor [Member]
   
Amounts Payable to Related Parties    
Accounts payable to related parties 4,889 8,983
Marketing Agent [Member]
   
Amounts Payable to Related Parties    
Accounts payable to related parties $ 4,889 $ 8,983