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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		9 Months Ended
	Apr. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting Information [Line Items]
Gross profit		$ 231,860	$ 227,995	$ 769,592	$ 653,125
Research and development		31,898	32,548	103,259	99,510
Selling, general and administrative		70,822	71,347	229,952	217,546
Acquisition and integration costs		36	2,466	(1,132)	4,698
Restructuring		1,364	10	3,374	2,596
Asset impairment					6,719
Fees and expenses related to repricing of term loan			492	378	492
Environmental costs				1,000
Amortization of intangible assets		10,695	10,977	32,786	34,946
Income from operations		117,045	110,155	399,975	286,618
Gain on sale of business	$ 74,856				74,856
Interest and other expense, net		2,529	8,784	10,173	24,846
Income before income taxes		114,516	101,371	389,802	336,628
Provision for income taxes		21,239	25,377	68,542	75,134
Net income		93,277	75,994	321,260	261,494
Vacuum & Analysis [Member]
Segment Reporting Information [Line Items]
Gross profit		132,835	141,438	462,418	410,228
Light & Motion [Member]
Segment Reporting Information [Line Items]
Gross profit		$ 99,025	$ 86,557	$ 307,174	$ 242,897

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