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Business Segment, Geographic Area, Product and Significant Customer Information - Reconciliation of Segment Assets to Consolidated Total Assets (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Consolidated total assets | $ 2,564,596 | $ 2,414,018
Other current assets | 75,298 | 53,543
Property, plant and equipment, net | 180,182 | 171,782
Other assets | 42,390 | 37,883
Operating Segments [Member] |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Consolidated total assets | 717,547 | 639,389
Segment Reconciling Items [Member] |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Cash and cash equivalents, restricted cash and investments | 630,030 | 553,976
Other current assets | 75,298 | 53,543
Property, plant and equipment, net | 180,182 | 171,782
Goodwill and intangible assets, net | 919,149 | 957,445
Other assets | $ 42,390 | $ 37,883

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