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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, 2012	Sep. 30, 2011
Amounts Payable to Related Parties
Accounts payable to related parties	$ 22,038	$ 21,500
Custodian [Member]
Amounts Payable to Related Parties
Accounts payable to related parties	3,908	3,816
Trustee [Member]
Amounts Payable to Related Parties
Accounts payable to related parties	164	164
Sponsor [Member]
Amounts Payable to Related Parties
Accounts payable to related parties	8,983	8,760
Marketing Agent [Member]
Amounts Payable to Related Parties
Accounts payable to related parties	$ 8,983	$ 8,760

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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