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Revenues by Product Lines (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenue from External Customer [Line Items]      
Total revenues $ 1,916,475 $ 1,854,658 $ 1,741,301
Network Security Gateways      
Revenue from External Customer [Line Items]      
Total revenues 468,509 506,057 516,254
Other      
Revenue from External Customer [Line Items]      
Total revenues [1] 57,048 52,969 56,710
Products and licenses      
Revenue from External Customer [Line Items]      
Total revenues 525,557 559,026 572,964
Security subscriptions      
Revenue from External Customer [Line Items]      
Total revenues 542,323 480,352 389,885
Software updates and maintenance      
Revenue from External Customer [Line Items]      
Total revenues $ 848,595 $ 815,280 $ 778,452
[1] Comprised of Endpoint security, Mobile security and Security management products, each comprising of less than 10% of products and licenses revenues.