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Business Segment, Geographic Area, Product and Significant Customer Information - Segment Assets by Reportable Segment (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Accounts receivable | $ 318,470 | $ 300,308
Inventory, net | 399,077 | 339,081
Total assets | 2,564,596 | 2,414,018
Operating Segments [Member] |  |
Segment Reporting Information [Line Items] |  |
Accounts receivable | 318,470 | 300,308
Inventory, net | 399,077 | 339,081
Total assets | 717,547 | 639,389
Operating Segments [Member] | Vacuum & Analysis [Member] |  |
Segment Reporting Information [Line Items] |  |
Accounts receivable | 195,244 | 201,318
Inventory, net | 235,253 | 197,831
Total assets | 430,497 | 399,149
Operating Segments [Member] | Light & Motion [Member] |  |
Segment Reporting Information [Line Items] |  |
Accounts receivable | 138,599 | 119,934
Inventory, net | 163,783 | 141,250
Total assets | 302,382 | 261,184
Corporate, Eliminations & Other [Member] |  |
Segment Reporting Information [Line Items] |  |
Accounts receivable | (15,373) | (20,944)
Inventory, net | 41 |
Total assets | $ (15,332) | $ (20,944)

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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