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Components and Allocation of Purchase Price (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Aug. 01, 2017
Dec. 31, 2016
Dec. 14, 2016
Business Acquisition [Line Items]          
Accounts receivable $ 5,075   $ 1,267  
Business combination, intangible assets 120,080   19,829 $ 11,000,000
Goodwill 326,735 327,333   59,548  
Deferred tax liabilities $ (43,608)   $ (5,841)  
Spectrum Inc.          
Business Acquisition [Line Items]          
Cash and cash equivalents     $ 10,137    
Accounts receivable     5,075    
Inventory     13,502    
Prepaid expenses and other assets     616    
Fixed assets     6,004    
Deferred tax assets     1,102    
Goodwill     265,722    
Accounts payable     (1,335)    
Unrecognized tax benefit     (576)    
Accrued liabilities     (5,787)    
Deferred tax liabilities     (43,608)    
Fair value of net assets acquired     370,932    
Spectrum Inc. | Customer relationships          
Business Acquisition [Line Items]          
Business combination, intangible assets     78,400    
Spectrum Inc. | Technology - developed          
Business Acquisition [Line Items]          
Business combination, intangible assets     38,560    
Spectrum Inc. | Trademark          
Business Acquisition [Line Items]          
Business combination, intangible assets     2,160    
Spectrum Inc. | Non-compete agreements          
Business Acquisition [Line Items]          
Business combination, intangible assets     $ 960