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Restructuring - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended
	Oct. 31, 2013	Mar. 31, 2014	Dec. 31, 2013
Restructuring Cost and Reserve [Line Items]
Percentage of reduction in global work force	50.00%
Charges for severance and related benefits			$ 2.8
Expected additional restructuring charges		$ 0

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Reduction In Global Workforce Percentage

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Amount expected to be recognized in earnings for the specified restructuring cost.

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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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