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Acquisitions - Allocation of Acquired Intangible Assets and Related Estimates of Useful Lives (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 17, 2015
May. 30, 2014
Mar. 12, 2013
Dec. 31, 2015
Dec. 31, 2014
Minimum [Member]          
Acquired Finite-Lived Intangible Assets [Line Items]          
Estimated useful life of finite-lived intangible assets       2 years  
Maximum [Member]          
Acquired Finite-Lived Intangible Assets [Line Items]          
Estimated useful life of finite-lived intangible assets       10 years  
Precisive, LLC [Member]          
Acquired Finite-Lived Intangible Assets [Line Items]          
Acquired intangible assets, purchase price $ 5,110     $ 5,110  
Granville-Phillips [Member]          
Acquired Finite-Lived Intangible Assets [Line Items]          
Acquired intangible assets, purchase price   $ 38,850     $ 38,850
Alter S.r.l [Member]          
Acquired Finite-Lived Intangible Assets [Line Items]          
Acquired intangible assets, purchase price     $ 2,806    
Order Backlog [Member] | Precisive, LLC [Member]          
Acquired Finite-Lived Intangible Assets [Line Items]          
Acquired intangible assets, purchase price $ 50        
Estimated useful life of finite-lived intangible assets 18 months        
Customer Relationships [Member] | Precisive, LLC [Member]          
Acquired Finite-Lived Intangible Assets [Line Items]          
Acquired intangible assets, purchase price $ 1,430     $ 1,430  
Estimated useful life of finite-lived intangible assets 8 years        
Customer Relationships [Member] | Granville-Phillips [Member]          
Acquired Finite-Lived Intangible Assets [Line Items]          
Acquired intangible assets, purchase price   $ 21,250     $ 21,250
Estimated useful life of finite-lived intangible assets   7 years      
Exclusive Patent License [Member] | Precisive, LLC [Member]          
Acquired Finite-Lived Intangible Assets [Line Items]          
Acquired intangible assets, purchase price $ 2,600        
Estimated useful life of finite-lived intangible assets 10 years        
Trade names [Member] | Precisive, LLC [Member]          
Acquired Finite-Lived Intangible Assets [Line Items]          
Acquired intangible assets, purchase price $ 210        
Estimated useful life of finite-lived intangible assets 10 years        
Developed Technology [Member] | Precisive, LLC [Member]          
Acquired Finite-Lived Intangible Assets [Line Items]          
Acquired intangible assets, purchase price $ 820        
Estimated useful life of finite-lived intangible assets 10 years        
Developed Technology [Member] | Granville-Phillips [Member]          
Acquired Finite-Lived Intangible Assets [Line Items]          
Acquired intangible assets, purchase price   $ 15,700      
Developed Technology [Member] | Granville-Phillips [Member] | Minimum [Member]          
Acquired Finite-Lived Intangible Assets [Line Items]          
Estimated useful life of finite-lived intangible assets   9 years      
Developed Technology [Member] | Granville-Phillips [Member] | Maximum [Member]          
Acquired Finite-Lived Intangible Assets [Line Items]          
Estimated useful life of finite-lived intangible assets   12 years      
Developed Technology [Member] | Alter S.r.l [Member]          
Acquired Finite-Lived Intangible Assets [Line Items]          
Acquired intangible assets, purchase price     $ 2,208    
Estimated useful life of finite-lived intangible assets     9 years    
Trademarks and Trade Names [Member] | Granville-Phillips [Member]          
Acquired Finite-Lived Intangible Assets [Line Items]          
Acquired intangible assets, purchase price   $ 1,900      
Estimated useful life of finite-lived intangible assets   12 years      
Trademarks and Trade Names [Member] | Alter S.r.l [Member]          
Acquired Finite-Lived Intangible Assets [Line Items]          
Acquired intangible assets, purchase price     $ 598    
Estimated useful life of finite-lived intangible assets     3 years