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Acquisitions - Summary of Purchase Price Allocation for Company's Acquisition of Pulpo Media, Inc (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Jun. 18, 2014
Dec. 31, 2013
Business Acquisition [Line Items]        
Goodwill $ 50,081 $ 50,081   $ 36,647
Pulpo Media Inc        
Business Acquisition [Line Items]        
Accounts receivable     $ 1,600  
Prepaids and other assets     100  
Property and equipment     500  
Intangible assets subject to amortization     3,400  
Goodwill     14,100  
Current liabilities     (1,800)  
Deferred income taxes     $ (1,500)