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Accrued Restructuring Expenses - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 192	$ 1,700	$ 192
Lease expiration date			2021

- 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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