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Acquisitions - Summary of Estimated Fair Value of Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Mar. 17, 2015
Mar. 12, 2013
Jun. 30, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
May. 30, 2014
Business Acquisition [Line Items]              
Goodwill       $ 199,703 $ 192,381 $ 150,909  
Total purchase price, net of cash acquired       9,910 86,950 $ 2,326  
Precisive, LLC [Member]              
Business Acquisition [Line Items]              
Current assets $ 693            
Non-current assets 18            
Intangible assets 5,110            
Goodwill 7,042     $ 7,042      
Total assets acquired 12,863            
Total current liabilities assumed (343)            
Total purchase price 12,520            
Less cash acquired (435)            
Total purchase price, net of cash acquired $ 12,085            
Granville-Phillips [Member]              
Business Acquisition [Line Items]              
Inventory             $ 5,198
Property and equipment             299
Intangible assets             38,850
Goodwill         $ 41,612   42,587
Other assets             191
Warranty liability             (175)
Total purchase price             $ 86,950
Alter S.r.l [Member]              
Business Acquisition [Line Items]              
Current assets   $ 1,053          
Property and equipment   211          
Intangible assets   2,806          
Goodwill   381          
Other assets   67          
Total assets acquired   4,518          
Debt (Note 15)   770          
Deferred taxes and other liabilities   1,301          
Total liabilities assumed   2,071          
Total purchase price   2,447          
Less cash acquired   (21)          
Total purchase price, net of cash acquired   $ 2,426 $ 2,058