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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
Mar. 31, 2018
Dec. 31, 2017
Segment Reporting, Asset Reconciling Item [Line Items]    
Consolidated total assets $ 2,481,456 $ 2,414,018
Other current assets 59,093 53,543
Property, plant and equipment, net 172,802 171,782
Other assets 39,952 37,883
Operating Segments [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Consolidated total assets 707,427 639,389
Segment Reconciling Items [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Cash and cash equivalents, restricted cash and investments 552,343 553,976
Other current assets 59,093 53,543
Property, plant and equipment, net 172,802 171,782
Goodwill and intangible assets, net 949,839 957,445
Other assets $ 39,952 $ 37,883