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Reorganization - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Dec. 31, 2011 Employee	Dec. 31, 2013 Employee	Dec. 31, 2012 Employee
Restructuring And Related Activities [Abstract]
Severance Costs	$ 0.4	$ 1.9	$ 1.4
Number of additional employees terminated related to sales reorganization and other cost reduction initiatives		31	17
Percentage of workforce reduction		2.50%
Number of sales employees for which severance was incurred based on statutory termination benefits	3

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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