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Consideration Transferred (Detail) - USD ($)
$ in Thousands
12 Months Ended
Aug. 01, 2017
Dec. 14, 2016
Apr. 01, 2016
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]          
Cash consideration       $ 112,795 $ 44,614
Equity consideration       247,575 14,135
Working capital adjustment       $ 425  
Estimated fair value of contingent consideration         $ 952
Spectrum Inc.          
Business Acquisition [Line Items]          
Cash consideration $ 122,932        
Equity consideration 247,575        
Working capital adjustment 425        
Total consideration transferred $ 370,932        
Atoll GmbH          
Business Acquisition [Line Items]          
Cash consideration, less $74 of working capital adjustments     $ 10,176    
Equity consideration     14,138    
Working capital adjustment     74    
Estimated fair value of contingent consideration     952    
Total consideration transferred     $ 25,266    
TangenX Technology Corporation          
Business Acquisition [Line Items]          
Cash consideration   $ 37,532      
Working capital adjustment   (382)      
Total consideration transferred   $ 37,150