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Restructuring Costs - Schedule of Restructuring Liability (Detail) (Accrued Severance [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014
Accrued Severance [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance	$ 281
Accruals	0
Payments	(281)
Ending balance	$ 0

- 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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