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Business Segment, Geographic Area, Product and Significant Customer Information - Reconciliation of Segment Gross Profit to Consolidated Net Income (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting Information [Line Items]
Gross profit	$ 168,385	$ 94,229	$ 382,211	$ 290,073
Research and development	32,268	17,217	77,709	51,464
Selling, general and administrative	70,424	33,396	175,803	97,532
Acquisition costs	233		10,932	30
Restructuring		562	24	1,569
Amortization of intangible assets	12,452	1,691	22,990	5,071
Income from operations	53,008	41,363	94,753	134,407
Interest and other (expense) income, net	(10,760)	721	(16,332)	2,015
Income before income taxes	42,248	42,084	78,421	136,422
Provision for income taxes	9,699	12,315	19,099	39,647
Net income	32,549	29,769	59,322	96,775
Vacuum & Analysis Division [Member]
Segment Reporting Information [Line Items]
Gross profit	104,232	$ 94,229	273,004	$ 290,073
Light & Motion Division [Member]
Segment Reporting Information [Line Items]
Gross profit	$ 64,153		$ 109,207

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