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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 | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Consolidated total assets | $ 3,381,948 | $ 2,614,246
Other current assets | 80,303 | 65,790
Property, plant and equipment, net | 230,649 | 194,367
Other assets | 44,228 | 38,682
Operating Segments [Member] |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Consolidated total assets | 793,027 | 680,143
Segment Reconciling Items [Member] |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Cash and cash equivalents and investments | 470,321 | 728,461
Other current assets | 80,303 | 65,790
Property, plant and equipment, net | 230,649 | 194,367
Right-of-use asset | 68,631 |
Goodwill and intangible assets, net | 1,658,039 | 906,803
Other assets | 44,228 | $ 38,682
Assets classified as held for sale | $ 36,750 |

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