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Severance Costs (Detail) (USD $) In Thousands, unless otherwise specified	0 Months Ended	3 Months Ended
	Dec. 03, 2013	Mar. 31, 2015	Mar. 31, 2014
Chief Executive Officer [Member]
Restructuring Cost and Reserve [Line Items]
Severance Costs	$ 915
Severance [Member]
Restructuring Reserve [Roll Forward]
Balance at beginning of year		89	1,142
Provision for additional expense		0	129
Payments and adjustments		(53)	(572)
Balance at end of period		$ 36	$ 699

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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- Definition

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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