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Commitments And Contingencies - Additional Information (Detail) (Non-cancelable purchase commitments, USD $) In Thousands, unless otherwise specified	Sep. 30, 2013
Non-cancelable purchase commitments
Long-term Purchase Commitment [Line Items]
Purchase commitments for less than one year	$ 17,373

The floor amount as of the balance sheet date that the entity must expend to satisfy the terms of disclosed arrangements (excluding long-term commitments) in which the entity has agreed to expend funds to procure goods or services from one or more suppliers, other than under a long-term purchase commitment or an unconditional purchase obligation.

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