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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
Dec. 31, 2013
Sep. 30, 2013
Amounts Payable to Related Parties    
Accounts payable to related parties $ 10,257 $ 12,133
Custodian [Member]
   
Amounts Payable to Related Parties    
Accounts payable to related parties 1,863 2,190
Trustee [Member]
   
Amounts Payable to Related Parties    
Accounts payable to related parties 170 165
Sponsor [Member]
   
Amounts Payable to Related Parties    
Accounts payable to related parties 4,112 4,889
Marketing Agent [Member]
   
Amounts Payable to Related Parties    
Accounts payable to related parties $ 4,112 $ 4,889