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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	1 Months Ended	3 Months Ended		6 Months Ended
	Apr. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting Information [Line Items]
Gross profit		$ 274,877	$ 219,583	$ 537,732	$ 425,130
Research and development		36,504	33,680	71,361	66,962
Selling, general and administrative		76,559	71,979	159,508	146,199
Acquisition and integration costs		(1,168)	790	(1,168)	2,232
Restructuring		790	2,064	2,010	2,586
Asset impairment			6,719		6,719
Environmental costs				1,000
Amortization of intangible assets		10,901	11,468	22,091	23,969
Income from operations		151,291	92,883	282,930	176,463
Gain on sale of business	$ 74,856		74,856		74,856
Interest and other expense, net		2,747	9,767	7,644	16,062
Income before income taxes		148,544	157,972	275,286	235,257
Provision for income taxes		25,682	37,532	47,303	49,757
Net income		122,862	120,440	227,983	185,500
Vacuum & Analysis [Member]
Segment Reporting Information [Line Items]
Gross profit		171,082	139,867	329,582	268,790
Light & Motion [Member]
Segment Reporting Information [Line Items]
Gross profit		$ 103,795	$ 79,716	$ 208,150	$ 156,340

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