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Provision for Employee Severance Benefits (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Restructuring and Related Activities [Abstract]
Provision for employee severance benefits beginning balance	$ 11,003	$ 300
Provision for the year	195us-gaap_SeveranceCosts1	14,017us-gaap_SeveranceCosts1
Payments during the year	(11,094)us-gaap_PaymentsToEmployees	(3,314)us-gaap_PaymentsToEmployees
Provision for employee severance benefits ending balance	$ 104	$ 11,003

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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