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Rollforward of Restructuring Liability (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Restructuring Cost and Reserve [Line Items]
Balance, beginning of the year	$ 2,220us-gaap_RestructuringReserve
Charges		4,751us-gaap_SeveranceCosts1
Amounts paid	(2,220)us-gaap_PaymentsForRestructuring	(2,531)us-gaap_PaymentsForRestructuring
Balance, end of the year		$ 2,220us-gaap_RestructuringReserve

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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