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Revenues by Product Lines (Detail) - USD ($) $ in Thousands | 12 Months Ended
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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.

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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition Revenue from circulation or sale of subscriptions (for example, but not limited to, subscriptions to a magazine or newspaper). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(a)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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