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Commitments And Contingencies - Additional Information (Detail) (Non-cancelable purchase commitments, USD $) In Thousands, unless otherwise specified	Sep. 30, 2014
Non-cancelable purchase commitments
Long-term Purchase Commitment [Line Items]
Purchase commitments for less than one year	$ 31,118

Minimum amount to be expended to satisfy the terms of arrangements in which the entity has agreed to expend funds to procure goods or services, excluding long-term purchase commitments or unconditional purchase obligations.

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