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Acquisitions - Acquisitions - Summary of Purchase Price Allocation for Company's Acquisition of Pulpo Media, Inc (Detail) (USD $)
Sep. 30, 2014
Jun. 18, 2014
Dec. 31, 2013
Business Acquisition [Line Items]      
Accounts receivable   $ 1,700,000  
Goodwill 50,456,000   36,647,000
Pulpo Media Inc
     
Business Acquisition [Line Items]      
Accounts receivable   1,600,000  
Prepaids and other assets   100,000  
Property and equipment   500,000  
Intangible assets subject to amortization   3,400,000  
Goodwill   13,800,000  
Current liabilities   (1,800,000)  
Deferred income taxes   $ (1,500,000)