Business Segment, Geographic Area, Product and Significant Customer Information - Reconciliation of Segment Assets to Consolidated Total Assets (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Total assets	$ 1,217,368	$ 1,213,018
Other current assets	28,735	16,715
Property, plant and equipment, net	73,642	77,536
Other assets	30,165	31,847
Reconciliation of Segment Assets to Consolidated Assets [Member]
Segment Reporting Information [Line Items]
Total assets	260,220	259,471
Cash and cash equivalents and investments	570,247	650,022
Other current assets	41,157	30,143
Property, plant and equipment, net	73,642	77,536
Goodwill and intangible assets, net	241,937	163,999
Other assets	$ 30,165	$ 31,847