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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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