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Business Segment, Geographic Area, Product and Significant Customer Information - Segment Assets by Reportable Segment (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Trade accounts receivable	$ 313,530	$ 295,454
Inventories	479,497	384,689
Total assets	3,381,948	2,614,246
Vacuum & Analysis [Member]
Segment Reporting Information [Line Items]
Trade accounts receivable	141,551	171,604
Inventories	232,595	222,965
Total assets	374,146	394,569
Light & Motion [Member]
Segment Reporting Information [Line Items]
Trade accounts receivable	155,452	140,658
Inventories	174,124	161,658
Total assets	329,576	302,316
Equipment & Solutions [Member]
Segment Reporting Information [Line Items]
Trade accounts receivable	46,322
Inventories	72,918
Total assets	119,240
Operating Segments [Member]
Segment Reporting Information [Line Items]
Trade accounts receivable	313,530	295,454
Inventories	479,497	384,689
Total assets	793,027	680,143
Corporate, Eliminations & Other [Member]
Segment Reporting Information [Line Items]
Trade accounts receivable	(29,795)	(16,808)
Inventories	(140)	66
Total assets	$ (29,935)	$ (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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