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Revenues by Product Lines (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Revenue from External Customer [Line Items]      
Products and licenses $ 555,792 $ 520,312 $ 496,930
Subscriptions 318,624 265,021 217,088
Software updates and maintenance 755,422 710,483 680,087
Total revenues 1,629,838 1,495,816 1,394,105
Network Security Gateways      
Revenue from External Customer [Line Items]      
Products and licenses 485,778 469,097 441,805
Subscriptions 318,624 265,021 217,088
Other      
Revenue from External Customer [Line Items]      
Products and licenses [1] $ 70,014 $ 51,216 $ 55,125
[1] Comprised of Endpoint security, Mobile security and Security management products, each consists of less than 10% of products and licenses revenues.