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Summary of Purchase Price Allocation (Detail) - USD ($)
$ in Thousands
12 Months Ended
Apr. 01, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Business Acquisition [Line Items]        
Goodwill   $ 27,765 $ 30,398 $ 25,809
Purchase price   (107) $ 31,474  
Global Thermoelectric Inc        
Business Acquisition [Line Items]        
Accounts receivable $ 10,200      
Inventory 6,487      
Deferred income tax assets, net 3,499      
Prepaid expenses and other assets 258      
Property and equipment 716 $ 716    
Goodwill 6,365      
Assumed liabilities (6,530)      
Net assets acquired 30,866      
Cash acquired on acquisition 2,954      
Purchase price 33,820      
Global Thermoelectric Inc | Order backlog        
Business Acquisition [Line Items]        
Intangible assets 815      
Global Thermoelectric Inc | Customer relationships        
Business Acquisition [Line Items]        
Intangible assets 5,524      
Global Thermoelectric Inc | Technology        
Business Acquisition [Line Items]        
Intangible assets 2,807      
Global Thermoelectric Inc | Trade Name        
Business Acquisition [Line Items]        
Intangible assets $ 725