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Business Combinations - Schedule of Useful Life and Fair Values of the Identifiable Intangible Assets (Details) - USD ($)
$ in Thousands
May. 09, 2014
Dec. 30, 2013
Dec. 31, 2014
Mandiant, Inc.      
Business Acquisition [Line Items]      
Total   $ 276,200 $ 276,200
nPulse Technologies      
Business Acquisition [Line Items]      
Total $ 24,700    
Developed technology | Mandiant, Inc.      
Business Acquisition [Line Items]      
Finite-lived intangible assets   $ 54,600  
Developed technology | nPulse Technologies      
Business Acquisition [Line Items]      
Finite-lived intangible asset, useful life 6 years    
Finite-lived intangible assets $ 10,100    
Content | Mandiant, Inc.      
Business Acquisition [Line Items]      
Finite-lived intangible asset, useful life   10 years  
Finite-lived intangible assets   $ 128,600  
Customer relationships | Mandiant, Inc.      
Business Acquisition [Line Items]      
Finite-lived intangible asset, useful life   8 years  
Finite-lived intangible assets   $ 65,400  
Customer relationships | nPulse Technologies      
Business Acquisition [Line Items]      
Finite-lived intangible asset, useful life 8 years    
Finite-lived intangible assets $ 8,000    
Contract backlog | Mandiant, Inc.      
Business Acquisition [Line Items]      
Finite-lived intangible assets   $ 13,800  
Trade names | Mandiant, Inc.      
Business Acquisition [Line Items]      
Finite-lived intangible asset, useful life   4 years  
Finite-lived intangible assets   $ 12,400  
In process research and development [Member] | Mandiant, Inc.      
Business Acquisition [Line Items]      
Indefinite-lived intangible assets   $ 1,400  
In process research and development [Member] | nPulse Technologies      
Business Acquisition [Line Items]      
Indefinite-lived intangible assets $ 6,600    
Minimum | Developed technology | Mandiant, Inc.      
Business Acquisition [Line Items]      
Finite-lived intangible asset, useful life   4 years  
Minimum | Contract backlog | Mandiant, Inc.      
Business Acquisition [Line Items]      
Finite-lived intangible asset, useful life   1 year  
Maximum | Developed technology | Mandiant, Inc.      
Business Acquisition [Line Items]      
Finite-lived intangible asset, useful life   6 years  
Maximum | Contract backlog | Mandiant, Inc.      
Business Acquisition [Line Items]      
Finite-lived intangible asset, useful life   3 years