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Acquisitions - Additional Information (Detail) - USD ($)
2 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Aug. 01, 2017
Dec. 14, 2016
Apr. 01, 2016
Sep. 30, 2017
Sep. 30, 2017
Sep. 30, 2017
Dec. 31, 2016
Business Acquisition [Line Items]              
Finite lived intangible asset, useful life           16 years 13 years
Goodwill       $ 326,652,000 $ 326,652,000 $ 326,652,000 $ 59,548,000
Common stock, par value       $ 0.01 $ 0.01 $ 0.01 $ 0.01
Customer relationships              
Business Acquisition [Line Items]              
Finite lived intangible asset, useful life           15 years 11 years
Technology - developed              
Business Acquisition [Line Items]              
Finite lived intangible asset, useful life           19 years 17 years
Atoll GmbH              
Business Acquisition [Line Items]              
Shares issued for business acquisition     538,700        
Value of common stock issued     $ 14,138,000        
Working capital adjustment     74,000        
Business combination, consideration transferred     25,266,000        
Fair value of net assets acquired     25,266,000        
Goodwill     17,077,000        
Goodwill expected to be deductible for tax purposes amount     0        
Business acquisition, transaction costs     $ 1,307,000        
Common stock, par value     $ 0.01        
Earnout consideration     $ 1,100,000        
Estimated fair value of contingent consideration     952,000        
Atoll GmbH | Up Front Payment              
Business Acquisition [Line Items]              
Cash consideration     10,200,000        
Atoll GmbH | Customer relationships              
Business Acquisition [Line Items]              
Fair value of acquired finite lived intangible assets     $ 5,318,000        
Finite lived intangible asset, useful life     13 years        
Atoll GmbH | Technology - developed              
Business Acquisition [Line Items]              
Fair value of acquired finite lived intangible assets     $ 2,175,000        
Finite lived intangible asset, useful life     14 years        
Atoll GmbH | Non-competition agreements              
Business Acquisition [Line Items]              
Fair value of acquired finite lived intangible assets     $ 57,000        
Finite lived intangible asset, useful life     2 years        
Atoll GmbH | Trademark              
Business Acquisition [Line Items]              
Fair value of acquired finite lived intangible assets     $ 11,000        
Finite lived intangible asset, useful life     2 years        
TangenX Technology Corporation              
Business Acquisition [Line Items]              
Cash consideration   $ 37,532,000          
Working capital adjustment   (382,000)          
Business combination, consideration transferred   37,150,000          
Fair value of net assets acquired   37,150,000          
Goodwill   29,501,000          
Goodwill expected to be deductible for tax purposes amount   0          
Business acquisition, transaction costs         $ 0 $ 376,000 $ 935,000
TangenX Technology Corporation | Customer relationships              
Business Acquisition [Line Items]              
Fair value of acquired finite lived intangible assets   $ 6,192,000          
Finite lived intangible asset, useful life   13 years          
TangenX Technology Corporation | Technology - developed              
Business Acquisition [Line Items]              
Fair value of acquired finite lived intangible assets   $ 6,044,000          
Finite lived intangible asset, useful life   20 years          
TangenX Technology Corporation | Non-competition agreements              
Business Acquisition [Line Items]              
Fair value of acquired finite lived intangible assets   $ 21,000          
Finite lived intangible asset, useful life   2 years          
TangenX Technology Corporation | Trademark              
Business Acquisition [Line Items]              
Fair value of acquired finite lived intangible assets   $ 11,000          
Finite lived intangible asset, useful life   5 years          
Spectrum Inc.              
Business Acquisition [Line Items]              
Cash consideration $ 122,932,000            
Shares issued for business acquisition 6,153,995            
Value of common stock issued $ 247,575,000            
Working capital adjustment 955,000            
Business combination, consideration transferred 371,462,000            
Fair value of net assets acquired 371,462,000            
Goodwill 265,084,000            
Goodwill expected to be deductible for tax purposes amount 0            
Business acquisition, revenue       $ 7,550,000      
Spectrum Inc. | Selling, general and administrative              
Business Acquisition [Line Items]              
Business Combination, Acquisition Related Costs         $ 3,378,000 $ 5,761,000  
Spectrum Inc. | Customer relationships              
Business Acquisition [Line Items]              
Fair value of acquired finite lived intangible assets $ 78,400,000            
Finite lived intangible asset, useful life 16 years            
Spectrum Inc. | Technology - developed              
Business Acquisition [Line Items]              
Fair value of acquired finite lived intangible assets $ 38,560,000            
Finite lived intangible asset, useful life 20 years            
Spectrum Inc. | Non-competition agreements              
Business Acquisition [Line Items]              
Fair value of acquired finite lived intangible assets $ 960,000            
Finite lived intangible asset, useful life 3 years            
Spectrum Inc. | Trademark              
Business Acquisition [Line Items]              
Fair value of acquired finite lived intangible assets $ 2,160,000