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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, 2018	Dec. 31, 2017
Segment Reporting, Asset Reconciling Item [Line Items]
Consolidated total assets	$ 2,614,246	$ 2,414,018
Other current assets	65,790	53,543
Property, plant and equipment, net	194,367	171,782
Other assets	38,682	37,883
Operating Segments [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Consolidated total assets	680,143	639,389
Segment Reconciling Items [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents, restricted cash and investments	728,461	553,976
Other current assets	65,790	53,543
Property, plant and equipment, net	194,367	171,782
Goodwill and intangible assets, net	906,803	957,445
Other assets	$ 38,682	$ 37,883

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