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Liability for Employee Rights upon Retirement - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Compensation and Retirement Disclosure [Abstract]
Severance pay expenses	$ 1,257,000us-gaap_SeveranceCosts1	$ 1,748,000us-gaap_SeveranceCosts1	$ 2,663,000us-gaap_SeveranceCosts1
Defined contribution plan expenses	5,030,000	3,747,000	3,572,000
Contribution plan expenses expected	$ 5,400,000

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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