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Business Segment, Geographic Area and Product Information - Reconciliation of Segment Assets to Consolidated Total Assets (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Consolidated total assets | $ 3,354,544 | $ 2,614,246
Other current assets | 94,011 | 65,790
Property, plant and equipment, net | 236,124 | 194,367
Other assets | 45,286 | 38,682
Operating Segments [Member] |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Consolidated total assets | 791,246 | 680,143
Segment Reconciling Items [Member] |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Cash and cash equivalents and investments | 485,274 | 728,461
Other current assets | 94,011 | 65,790
Property, plant and equipment, net | 236,124 | 194,367
Right-of-use asset | 67,632 |
Goodwill and intangible assets, net | 1,634,971 | 906,803
Other assets | $ 45,286 | $ 38,682

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