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