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Etratech Acquisition - Summary of Preliminary Allocation (Detail) - USD ($)
$ in Thousands
12 Months Ended
Nov. 01, 2017
Nov. 01, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]          
Goodwill     $ 69,685 $ 51,735 $ 27,765
Purchase price     66,994 $ 73,593 $ (107)
Etratech Inc.          
Business Acquisition [Line Items]          
Accounts receivable $ 12,654        
Inventory 7,014        
Prepaid expenses and other assets 535        
Property and equipment 6,205   $ 6,205    
Goodwill 14,866        
Assumed liabilities (9,642)        
Net assets acquired 64,994 $ 64,994      
Cash acquired on acquisition 670 $ 670      
Purchase price 65,664        
Etratech Inc. | Customer relationships          
Business Acquisition [Line Items]          
Intangible assets 24,774        
Etratech Inc. | Technology          
Business Acquisition [Line Items]          
Intangible assets $ 8,588