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Schedule of Restructuring Accruals Expenses (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Restructuring Reserve [Roll Forward]
Beginning balance	$ 0us-gaap_RestructuringReserve	$ 10,887,000us-gaap_RestructuringReserve
Restructuring expenses	13,672,000us-gaap_RestructuringCharges	0us-gaap_RestructuringCharges	32,473,000us-gaap_RestructuringCharges
Payments, utilization and other	(7,616,000)	(10,887,000)
Ending balance	$ 6,056,000us-gaap_RestructuringReserve	$ 0us-gaap_RestructuringReserve	$ 10,887,000us-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.

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