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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

Carrying amount as of the balance sheet date of obligations due all related parties. For classified balance sheets, represents the current portion of such liabilities (due within one year or within the normal operating cycle if longer).

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