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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 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Consolidated total assets | $ 2,414,018 | $ 2,212,242
Other current assets | 53,543 | 50,770
Property, plant and equipment, net | 171,782 | 174,559
Other assets | 37,883 | 32,467
Operating Segments [Member] |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Consolidated total assets | 639,389 | 524,626
Segment Reconciling Items [Member] |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Cash and cash equivalents, restricted cash and investments | 553,976 | 433,231
Other current assets | 53,543 | 50,770
Property, plant and equipment, net | 171,782 | 174,559
Goodwill and intangible assets, net | 957,445 | 996,589
Other assets | $ 37,883 | $ 32,467

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