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Restructuring - Additional Information (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015 USD ($) People	Sep. 30, 2014 USD ($) People	Sep. 30, 2015 USD ($) People	Sep. 30, 2014 USD ($) People
Reorganizations [Abstract]
Restructuring expense	$ 562	$ 1,223	$ 1,569	$ 1,970
Number of workforce reduction from the company's headcount | People	137	111	137	111

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The number of positions eliminated during the period as a result of restructuring activities.

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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