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Severance and Other Charges - Summary of Activity Related to Severance Charges (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Restructuring and Related Activities [Abstract]
Balance as of December 31, 2013	$ 0
Charges	1,933
Payments	0
Balance as of September 30, 2014	$ 1,933	$ 49

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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