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Intangible Assets - Additional Information (Details) |  | 12 Months Ended
--- | --- | ---
Jan. 02, 2015 | Dec. 31, 2017 USD ($) Reporting_Unit | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Finite And Indefinite Intangible Assets [Line Items] |  |  |  |
Number of reporting units used in quantitative assessment | Reporting_Unit |  | 5 |  |
Number of reporting units used in qualitative assessment | Reporting_Unit |  | 7 |  |
Recognized amortization expenses |  | $ 103,997,000 | $ 98,385,000 | $ 103,791,000
Estimated amortization expense in 2018 |  | 88,200,000 |  |
Estimated amortization expense in 2019 |  | 78,100,000 |  |
Estimated amortization expense in 2020 |  | 61,700,000 |  |
Estimated amortization expense in 2021 |  | 29,700,000 |  |
Estimated amortization expense in 2022 |  | 27,000,000 |  |
Finite-lived intangible assets, net carrying amount |  | 450,749,000 | 436,410,000 |
Goodwill impairment charges |  | 0 | 0 | 0
Impairment charges |  | $ 0 | 0 | 0
Customer Relationships [Member] |  |  |  |
Finite And Indefinite Intangible Assets [Line Items] |  |  |  |
Weighted-average amortization period |  | 18 years 6 months |  |
Finite-lived intangible assets, net carrying amount |  | $ 222,375,000 | 231,240,000 |
Trademarks [Member] |  |  |  |
Finite And Indefinite Intangible Assets [Line Items] |  |  |  |
Weighted-average amortization period |  | 8 years |  |
Finite-lived intangible assets, net carrying amount |  | $ 38,146,000 | 9,619,000 |
Impairment charges |  | $ 0 | 0 | 0
Developed Technology [Member] |  |  |  |
Finite And Indefinite Intangible Assets [Line Items] |  |  |  |
Weighted-average amortization period |  | 6 years 6 months |  |
Finite-lived intangible assets, net carrying amount |  | $ 180,283,000 | 181,695,000 |
In-Process Research and Development [Member] |  |  |  |
Finite And Indefinite Intangible Assets [Line Items] |  |  |  |
Weighted-average amortization period |  | 4 years 8 months 15 days |  |
Finite-lived intangible assets, net carrying amount |  | $ 9,945,000 | $ 13,856,000 |
Tripwire [Member] |  |  |  |
Finite And Indefinite Intangible Assets [Line Items] |  |  |  |
Recognized amortization expenses |  |  |  | $ 43,200,000
Weighted-average amortization period | 7 years 11 months |  |  |
Tripwire [Member] | Customer Relationships [Member] |  |  |  |
Finite And Indefinite Intangible Assets [Line Items] |  |  |  |
Weighted-average amortization period | 15 years |  |  |
Tripwire [Member] | Trademarks [Member] |  |  |  |
Finite And Indefinite Intangible Assets [Line Items] |  |  |  |
Recognized amortization expenses |  | $ 3,100,000 |  |
Weighted-average amortization period | 10 years | 10 years |  |
Finite-lived intangible assets, net carrying amount |  | $ 27,900,000 |  |
Tripwire [Member] | Developed Technology [Member] |  |  |  |
Finite And Indefinite Intangible Assets [Line Items] |  |  |  |
Weighted-average amortization period | 5 years 9 months 18 days |  |  |

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- Definition Number of Reporting Units Used in Qualitative Assessment + References No definition available. + Details
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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 The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13777-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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