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Business Segment, Geographic Area, Product and Significant Customer Information - Reconciliation of Segment Assets to Consolidated Total Assets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Total assets	$ 1,224,044us-gaap_Assets	$ 1,213,018us-gaap_Assets
Other current assets	27,512us-gaap_OtherAssetsCurrent	16,715us-gaap_OtherAssetsCurrent
Property, plant and equipment, net	72,776us-gaap_PropertyPlantAndEquipmentNet	77,536us-gaap_PropertyPlantAndEquipmentNet
Other assets	17,206us-gaap_OtherAssetsNoncurrent	31,847us-gaap_OtherAssetsNoncurrent
Reconciliation of Segment Assets to Consolidated Assets [Member]
Segment Reporting Information [Line Items]
Total assets	261,531	259,471
Cash and cash equivalents and investments	592,232	650,022
Other current assets	41,529	30,143
Property, plant and equipment, net	72,776	77,536
Goodwill and intangible assets, net	238,770	163,999
Other assets	$ 17,206	$ 31,847