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Business Segment, Geographic Area, Product and Significant Customer Information - Segment Assets by Reportable Segment (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Accounts receivable	$ 339,958	$ 300,308
Inventory, net	384,929	339,081
Total assets	2,573,488	2,414,018
Operating Segments [Member]
Segment Reporting Information [Line Items]
Accounts receivable	339,958	300,308
Inventory, net	384,929	339,081
Total assets	724,887	639,389
Operating Segments [Member] | Vacuum & Analysis [Member]
Segment Reporting Information [Line Items]
Accounts receivable	227,639	201,318
Inventory, net	227,635	197,831
Total assets	455,274	399,149
Operating Segments [Member] | Light & Motion [Member]
Segment Reporting Information [Line Items]
Accounts receivable	127,553	119,934
Inventory, net	157,294	141,250
Total assets	284,847	261,184
Corporate, Eliminations & Other [Member]
Segment Reporting Information [Line Items]
Accounts receivable	(15,234)	(20,944)
Total assets	$ (15,234)	$ (20,944)

X

- Definition

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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