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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				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting Information [Line Items]
Gross profit	$ 211,027		$ 274,877		$ 409,145	$ 537,732
Research and development	41,855		36,504		80,788	71,361
Selling, general and administrative	83,236		76,181		165,691	159,130
Fees and expenses related to term loan			378		5,847	378
Acquisition and integration costs	3,240		(1,168)		33,407	(1,168)
Restructuring and other	1,242		790		3,165	3,010
Amortization of intangible assets	17,552		10,901		33,279	22,091
Income from operations	63,902		151,291		86,968	282,930
Interest and other expense, net	12,039		2,747		19,769	7,644
Income before income taxes	51,863		148,544		67,199	275,286
Provision for income taxes	14,124		25,682		17,005	47,303
Net income	37,739	$ 12,455	122,862	$ 105,121	50,194	227,983
Vacuum & Analysis [Member]
Segment Reporting Information [Line Items]
Gross profit	102,095		171,082		200,234	329,582
Light & Motion [Member]
Segment Reporting Information [Line Items]
Gross profit	84,948		$ 103,795		177,689	$ 208,150
Equipment & Solutions [Member]
Segment Reporting Information [Line Items]
Gross profit	$ 23,984				$ 31,222

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