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Acquisitions - Intangible Assets Related to Acquisition (Detail) - USD ($) $ in Thousands |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 02, 2015 | Jun. 11, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Goodwill |  |  |  | $ 1,385,115 | $ 943,374 | $ 773,048
Developed Technology [Member] |  |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Weighted average amortization period |  |  |  | 5 years 3 months 18 days |  |
Customer Relationships [Member] |  |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Weighted average amortization period |  |  |  | 18 years 9 months 18 days |  |
In-Process/Service Research and Development [Member] |  |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Weighted average amortization period |  |  |  | 4 years 7 months 6 days |  |
Tripwire [Member] |  |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Intangible assets subject to amortization | $ 269,000 |  |  |  |  |
Goodwill | 462,215 |  |  |  |  |
Intangible assets not subject to amortization | 499,215 |  |  |  |  |
Total intangible assets | $ 768,215 |  |  |  |  |
Weighted average amortization period | 7 years 8 months 12 days |  |  |  |  |
Tripwire [Member] | Trademarks [Member] |  |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Intangible assets not subject to amortization | $ 31,000 |  |  |  |  |
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] | Backlog [Member] |  |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Intangible assets subject to amortization | $ 3,000 |  |  |  |  |
Weighted average amortization period | 1 year |  |  |  |  |
Tripwire [Member] | In-Process/Service Research and Development [Member] |  |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Intangible assets not subject to amortization | $ 6,000 |  |  |  |  |
Prosoft Technology, Inc. [Member] |  |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Intangible assets subject to amortization |  | $ 40,800 |  |  |  |
Goodwill |  | 56,923 |  |  |  |
Intangible assets not subject to amortization |  | 56,923 |  |  |  |
Total intangible assets |  | $ 97,723 |  |  |  |
Weighted average amortization period |  | 14 years 9 months 18 days |  |  |  |
Prosoft Technology, Inc. [Member] | Trademarks [Member] |  |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Intangible assets subject to amortization |  | $ 5,000 |  |  |  |
Weighted average amortization period |  | 5 years |  |  |  |
Prosoft Technology, Inc. [Member] | Developed Technology [Member] |  |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Intangible assets subject to amortization |  | $ 9,000 |  |  |  |
Weighted average amortization period |  | 5 years |  |  |  |
Prosoft Technology, Inc. [Member] | Customer Relationships [Member] |  |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Intangible assets subject to amortization |  | $ 26,600 |  |  |  |
Weighted average amortization period |  | 20 years |  |  |  |
Prosoft Technology, Inc. [Member] | Backlog [Member] |  |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Intangible assets subject to amortization |  | $ 200 |  |  |  |
Weighted average amortization period |  | 3 months 18 days |  |  |  |
Grass Valley [Member] |  |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Intangible assets subject to amortization |  |  | $ 65,500 |  |  |
Goodwill |  |  | 131,070 |  |  |
Intangible assets not subject to amortization |  |  | 161,070 |  |  |
Total intangible assets |  |  | $ 226,570 |  |  |
Weighted average amortization period |  |  | 9 years |  |  |
Grass Valley [Member] | Trademarks [Member] |  |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Intangible assets not subject to amortization |  |  | $ 22,000 |  |  |
Grass Valley [Member] | Developed Technology [Member] |  |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Intangible assets subject to amortization |  |  | $ 37,000 |  |  |
Weighted average amortization period |  |  | 5 years |  |  |
Grass Valley [Member] | Customer Relationships [Member] |  |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Intangible assets subject to amortization |  |  | $ 27,000 |  |  |
Weighted average amortization period |  |  | 15 years |  |  |
Grass Valley [Member] | Backlog [Member] |  |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Intangible assets subject to amortization |  |  | $ 1,500 |  |  |
Weighted average amortization period |  |  | 3 months 18 days |  |  |
Grass Valley [Member] | In-Process/Service Research and Development [Member] |  |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Intangible assets not subject to amortization |  |  | $ 8,000 |  |  |

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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=26713463&loc=d3e16265-109275 + Details
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