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Acquisitions - Summary of Estimated Fair Value of Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Thousands
 6 Months Ended
Mar. 17, 2015
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
May. 30, 2014
Dec. 31, 2013
Business Acquisition [Line Items]            
Goodwill   $ 200,212   $ 192,381   $ 150,909
Total purchase price, net of cash acquired   9,910 $ 86,950      
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  
Other assets         191  
Intangible assets         38,850  
Goodwill     $ 41,612   42,587  
Warranty liability         (175)  
Total purchase price         $ 86,950