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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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