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Business Segment, Geographic Area, Product and Significant Customer Information - Segment Assets by Reportable Segment (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Accounts receivable	$ 335,990	$ 295,454
Inventory, net	475,633	384,689
Total assets	3,412,738	2,614,246
Vacuum & Analysis [Member]
Segment Reporting Information [Line Items]
Accounts receivable	160,040	171,604
Inventory, net	225,431	222,965
Total assets	385,471	394,569
Light & Motion [Member]
Segment Reporting Information [Line Items]
Accounts receivable	139,592	140,658
Inventory, net	164,603	161,658
Total assets	304,195	302,316
Equipment & Solutions [Member]
Segment Reporting Information [Line Items]
Accounts receivable	51,088
Inventory, net	85,690
Total assets	136,778
Operating Segments [Member]
Segment Reporting Information [Line Items]
Accounts receivable	335,990	295,454
Inventory, net	475,633	384,689
Total assets	811,623	680,143
Corporate, Eliminations & Other [Member]
Segment Reporting Information [Line Items]
Accounts receivable	(14,730)	(16,808)
Inventory, net	(91)	66
Total assets	$ (14,821)	$ (16,742)

X

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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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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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