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Acquisitions - Additional Information (Detail) - USD ($)
$ in Thousands
 6 Months Ended
Mar. 17, 2015
Jun. 30, 2015
Jun. 30, 2014
May. 30, 2014
Business Acquisition [Line Items]        
Payments to acquire business, net of cash acquired   $ 9,910 $ 86,950  
Precisive, LLC [Member]        
Business Acquisition [Line Items]        
Payments to acquire business, net of cash acquired $ 12,085      
Business acquisition, ownership percentage 100.00%      
Business acquisition, cash acquired $ 435      
Business acquisition, deferred consideration payment $ 2,600      
Business acquisition, deferred consideration payment period 15 months      
Business combination consideration price $ 12,520      
Granville-Phillips [Member]        
Business Acquisition [Line Items]        
Business combination consideration price       $ 86,950