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Acquisition - Summary of Allocation of Consideration to Fair Value of Tangible and Intangible Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 15, 2016
Dec. 31, 2015
Business Acquisition [Line Items]        
Goodwill $ 36,389 $ 37,448   $ 34,972
Camouflage Software, Inc [Member]        
Business Acquisition [Line Items]        
Goodwill     $ 2,476  
Total intangible assets acquired     4,286  
Other acquired tangible assets     363  
Liability assumed     (130)  
Fair value of assets acquired     4,519  
Camouflage Software, Inc [Member] | Acquired Technology [Member]        
Business Acquisition [Line Items]        
Intangible assets acquired other than goodwill     1,050  
Camouflage Software, Inc [Member] | Customer Relationships [Member]        
Business Acquisition [Line Items]        
Intangible assets acquired other than goodwill     480  
Camouflage Software, Inc [Member] | Trade Name and Other [Member]        
Business Acquisition [Line Items]        
Intangible assets acquired other than goodwill     $ 280