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Acquisitions - Summary of Purchase Price Allocation for Company's Acquisition of Pulpo (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Jun. 18, 2014
Business Acquisition [Line Items]        
Goodwill $ 50,081 $ 50,081 $ 50,081  
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)