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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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