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Acquisitions - Summary of Estimated Fair Value of Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 17, 2015
Mar. 31, 2015
Mar. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Business Acquisition [Line Items]          
Goodwill     $ 199,999 $ 199,703 $ 192,381
Total purchase price, net of cash acquired   $ 9,867      
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