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Acquisitions - Intangible Assets Related to Acquisition (Details) - USD ($) $ in Thousands |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
May 31, 2017 | Jan. 02, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |
Goodwill |  |  | $ 1,478,257 | $ 1,385,995 | $ 1,385,115
Developed Technology [Member] |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |
Weighted average amortization period |  |  | 6 years 6 months |  |
Customer Relationships [Member] |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |
Weighted average amortization period |  |  | 18 years 6 months |  |
Trademarks [Member] |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |
Weighted average amortization period |  |  | 8 years |  |
Thinklogical Holdings LLC [Member] |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |
Intangible assets subject to amortization | $ 73,400 |  |  |  |
Goodwill | 71,394 |  |  |  |
Intangible assets not subject to amortization | 71,394 |  |  |  |
Total intangible assets | $ 144,794 |  |  |  |
Weighted average amortization period | 9 years 7 months 6 days |  |  |  |
Thinklogical Holdings LLC [Member] | Developed Technology [Member] |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |
Intangible assets subject to amortization | $ 62,600 |  |  |  |
Weighted average amortization period | 10 years |  |  |  |
Thinklogical Holdings LLC [Member] | Customer Relationships [Member] |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |
Intangible assets subject to amortization | $ 6,500 |  |  |  |
Weighted average amortization period | 8 years |  |  |  |
Thinklogical Holdings LLC [Member] | Trademarks [Member] |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |
Intangible assets subject to amortization | $ 2,900 |  |  |  |
Weighted average amortization period | 10 years |  |  |  |
Thinklogical Holdings LLC [Member] | Sales Backlog [Member] |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |
Intangible assets subject to amortization | $ 1,400 |  |  |  |
Weighted average amortization period | 3 months 19 days |  |  |  |
Tripwire [Member] |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |
Intangible assets subject to amortization |  | $ 300,000 |  |  |
Goodwill |  | 462,215 |  |  |
Intangible assets not subject to amortization |  | 468,215 |  |  |
Total intangible assets |  | $ 768,215 |  |  |
Weighted average amortization period |  | 7 years 11 months |  |  |
Tripwire [Member] | In-Process Research and Development [Member] |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |
Intangible assets not subject to amortization |  | $ 6,000 |  |  |
Tripwire [Member] | Developed Technology [Member] |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |
Intangible assets subject to amortization |  | $ 210,000 |  |  |
Weighted average amortization period |  | 5 years 9 months 18 days |  |  |
Tripwire [Member] | Customer Relationships [Member] |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |
Intangible assets subject to amortization |  | $ 56,000 |  |  |
Weighted average amortization period |  | 15 years |  |  |
Tripwire [Member] | Trademarks [Member] |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |
Intangible assets subject to amortization |  | $ 31,000 |  |  |
Weighted average amortization period |  | 10 years | 10 years |  |
Tripwire [Member] | Backlog [Member] |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |
Intangible assets subject to amortization |  | $ 3,000 |  |  |
Weighted average amortization period |  | 1 year |  |  |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Amount of assets, excluding financial assets and goodwill, that lack physical substance, having a projected indefinite period of benefit, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition The amount of identifiable intangible assets recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=84160947&loc=d3e2207-128464 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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