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Business Segment, Geographic Area, Product Information and Significant Customer Information - Segment Assets by Reportable Segment (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Accounts receivable	$ 341,064	$ 295,454
Inventory	462,146	384,689
Total assets	3,416,320	2,614,246
Vacuum & Analysis [Member]
Segment Reporting Information [Line Items]
Accounts receivable	185,889	171,604
Inventory	224,815	222,965
Total assets	410,704	394,569
Light & Motion [Member]
Segment Reporting Information [Line Items]
Accounts receivable	147,150	140,658
Inventory	163,768	161,658
Total assets	310,918	302,316
Equipment & Solutions [Member]
Segment Reporting Information [Line Items]
Accounts receivable	40,125
Inventory	73,458
Total assets	113,583
Operating Segments [Member]
Segment Reporting Information [Line Items]
Accounts receivable	341,064	295,454
Inventory	462,146	384,689
Total assets	803,210	680,143
Corporate, Eliminations & Other [Member]
Segment Reporting Information [Line Items]
Accounts receivable	(32,100)	(16,808)
Inventory	105	66
Total assets	$ (31,995)	$ (16,742)

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Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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