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Business Segment, Geographic Area, Product and Significant Customer Information - Segment Assets by Reportable Segment (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Accounts receivable	$ 295,454	$ 300,308
Inventory, net	384,689	339,081
Total assets	2,614,246	2,414,018
Operating Segments [Member]
Segment Reporting Information [Line Items]
Accounts receivable	295,454	300,308
Inventory, net	384,689	339,081
Total assets	680,143	639,389
Operating Segments [Member] | Vacuum & Analysis [Member]
Segment Reporting Information [Line Items]
Accounts receivable	171,604	201,318
Inventory, net	222,965	197,831
Total assets	394,569	399,149
Operating Segments [Member] | Light & Motion [Member]
Segment Reporting Information [Line Items]
Accounts receivable	140,658	119,934
Inventory, net	161,658	141,250
Total assets	302,316	261,184
Corporate, Eliminations & Other [Member]
Segment Reporting Information [Line Items]
Accounts receivable	(16,808)	(20,944)
Inventory, net	66
Total assets	$ (16,742)	$ (20,944)

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Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

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