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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, 2018	Dec. 31, 2017
Segment Reporting, Asset Reconciling Item [Line Items]
Consolidated total assets	$ 2,573,488	$ 2,414,018
Other current assets	61,720	53,543
Property, plant and equipment, net	174,054	171,782
Other assets	39,832	37,883
Operating Segments [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Consolidated total assets	724,887	639,389
Segment Reconciling Items [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents, restricted cash and investments	641,593	553,976
Other current assets	61,720	53,543
Property, plant and equipment, net	174,054	171,782
Goodwill and intangible assets, net	931,402	957,445
Other assets	$ 39,832	$ 37,883

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