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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
	Mar. 31, 2019	Mar. 31, 2018
Segment Reporting Information [Line Items]
Gross profit	$ 198,118	$ 262,855
Research and development	38,933	34,857
Selling, general and administrative	82,455	82,949
Fees and expenses related to incremental term loan	5,847
Acquisition and integration costs	30,167
Restructuring	223	1,220
Customer contract obligation	1,700
Environmental costs		1,000
Amortization of intangible assets	15,727	11,190
Income from operations	23,066	131,639
Interest and other expense, net	7,730	4,897
Income before income taxes	15,336	126,742
Provision for income taxes	2,881	21,621
Net income	12,455	105,121
Vacuum & Analysis [Member]
Segment Reporting Information [Line Items]
Gross profit	98,139	158,500
Light & Motion [Member]
Segment Reporting Information [Line Items]
Gross profit	92,741	$ 104,355
Equipment & Solutions [Member]
Segment Reporting Information [Line Items]
Gross profit	$ 7,238

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