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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)

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