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Restructuring - Changes in Liability and Balance Related to Restructuring Plans (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Changes in the liability and the balance related restructuring plan
Balance at beginning of the period	$ 44us-gaap_RestructuringReserve	$ 185us-gaap_RestructuringReserve	$ 828us-gaap_RestructuringReserve
Restructuring charge	14us-gaap_RestructuringCharges	764us-gaap_RestructuringCharges	185us-gaap_RestructuringCharges
Payments	(58)us-gaap_PaymentsForRestructuring	(905)us-gaap_PaymentsForRestructuring	(828)us-gaap_PaymentsForRestructuring
Balance at ending of the period		$ 44us-gaap_RestructuringReserve	$ 185us-gaap_RestructuringReserve

- 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.

+ References+ Details