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Acquisitions - Additional Information (Detail) - USD ($)
5 Months Ended 12 Months Ended
Aug. 01, 2017
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 14, 2016
Business Acquisition [Line Items]            
Cash consideration     $ 112,795,000 $ 44,614,000  
Value of common stock issued     247,575,000 14,135,000  
Working capital adjustment     425,000    
Fair value of acquired finite lived intangible assets   $ 120,080,000 $ 120,080,000 19,829,000 $ 11,000,000,000
Finite lived intangible asset, useful life     16 years 16 years    
Goodwill   327,333,000 $ 326,735,000 $ 327,333,000 $ 59,548,000  
Customer relationships            
Business Acquisition [Line Items]            
Finite lived intangible asset, useful life     14 years 14 years    
Technology - developed            
Business Acquisition [Line Items]            
Finite lived intangible asset, useful life     19 years 19 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 425,000          
Business combination, consideration transferred 370,932,000          
Fair value of net assets acquired 370,932,000          
Goodwill 265,722,000          
Goodwill expected to be deductible for tax purposes amount 0          
Business acquisition, revenue   $ 19,400,000        
Spectrum Inc. | Selling, general and administrative            
Business Acquisition [Line Items]            
Business Combination, Acquisition Related Costs     $ 2,900,000 $ 7,100,000    
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 15 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-compete 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          
Minimum | Spectrum Inc. | Trademark            
Business Acquisition [Line Items]            
Finite lived intangible asset, useful life 2 years          
Maximum | Spectrum Inc. | Trademark            
Business Acquisition [Line Items]            
Finite lived intangible asset, useful life 20 years