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Revenues by Product Lines (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Revenue from External Customer [Line Items]      
Products and licenses $ 559,026 $ 572,964 $ 555,792
Security subscriptions 480,352 389,885 318,624
Software updates and maintenance 815,280 778,452 755,422
Total revenues 1,854,658 1,741,301 1,629,838
Network Security Gateways      
Revenue from External Customer [Line Items]      
Products and licenses 506,057 516,254 485,778
Other      
Revenue from External Customer [Line Items]      
Products and licenses [1] $ 52,969 $ 56,710 $ 70,014
[1] Comprised of Endpoint security, Mobile security and Security management products, each comprising of less than 10% of products and licenses revenues.