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Restructuring and Severance - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Restructuring Cost and Reserve [Line Items]
Unpaid severance and related charges	$ 0
Reduction [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and severance charges	$ 200,000	$ 1,600,000	$ 2,000,000

- Definition

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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