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Reorganization - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2014	Sep. 30, 2014	Dec. 31, 2013 Employee
Restructuring and Related Activities [Abstract]
Severance and related costs		$ 1.8	$ 1.9
Percentage of workforce reduction	1.00%		2.50%
Number of additional employees terminated related to sales reorganization and other cost reduction initiatives			31

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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