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Business Segment, Geographic Area and Product Information - Segment Assets by Reportable Segment (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Trade accounts receivable	$ 327,983	$ 295,454
Inventories	463,263	384,689
Total assets	3,354,544	2,614,246
Vacuum & Analysis [Member]
Segment Reporting Information [Line Items]
Trade accounts receivable	156,066	171,604
Inventories	221,182	222,965
Total assets	377,248	394,569
Light & Motion [Member]
Segment Reporting Information [Line Items]
Trade accounts receivable	159,061	140,658
Inventories	168,597	161,658
Total assets	327,658	302,316
Equipment & Solutions [Member]
Segment Reporting Information [Line Items]
Trade accounts receivable	40,289
Inventories	73,449
Total assets	113,738
Operating Segments [Member]
Segment Reporting Information [Line Items]
Trade accounts receivable	327,983	295,454
Inventories	463,263	384,689
Total assets	791,246	680,143
Corporate, Eliminations & Other [Member]
Segment Reporting Information [Line Items]
Trade accounts receivable	(27,433)	(16,808)
Inventories	35	66
Total assets	$ (27,398)	$ (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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