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Reorganization - Summary of Rolls Forward of Activity in Reorganization Accrual (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Restructuring Cost and Reserve [Line Items]
Additions	$ 1,817us-gaap_RestructuringCharges	$ 1,905us-gaap_RestructuringCharges	$ 1,421us-gaap_RestructuringCharges
Workforce Reduction [Member]
Restructuring Cost and Reserve [Line Items]
Accrual Beginning Balance	121	14
Additions	1,817	1,905
Cash payments	(1,820)	(1,798)
Accrual Ending Balance	$ 118	$ 121

- 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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