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Business Segment, Geographic Area, Product and Significant Customer Information - Segment Assets by Reportable Segment (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Accounts receivable	$ 318,470	$ 300,308
Inventory, net	399,077	339,081
Total assets	2,564,596	2,414,018
Operating Segments [Member]
Segment Reporting Information [Line Items]
Accounts receivable	318,470	300,308
Inventory, net	399,077	339,081
Total assets	717,547	639,389
Operating Segments [Member] | Vacuum & Analysis [Member]
Segment Reporting Information [Line Items]
Accounts receivable	195,244	201,318
Inventory, net	235,253	197,831
Total assets	430,497	399,149
Operating Segments [Member] | Light & Motion [Member]
Segment Reporting Information [Line Items]
Accounts receivable	138,599	119,934
Inventory, net	163,783	141,250
Total assets	302,382	261,184
Corporate, Eliminations & Other [Member]
Segment Reporting Information [Line Items]
Accounts receivable	(15,373)	(20,944)
Inventory, net	41
Total assets	$ (15,332)	$ (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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