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Reorganization - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013 Job
Restructuring And Related Activities [Abstract]
Severance and related costs	$ 1.9
Number of jobs eliminated worldwide	31
Number of jobs eliminated worldwide, percentage	2.50%

Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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