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Contingencies and Guarantees - Additional information (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended
	Sep. 30, 2011	Sep. 30, 2012
Commitments and Contingencies Disclosure [Line Items]
Non-cancelable purchase order commitment	$ 1.2
Non-cancelable purchase order delivery period	12 months
Non-cancelable purchase order commitment remained		$ 0.4

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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