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Trade Accounts Receivable and Allowance for Doubtful Accounts - Customers Who Accounted for More than 10% of Trade Accounts Receivable, Net (Detail) (Accounts Receivable [Member])
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Central Banks [Member]
   
Concentration Risk [Line Items]    
Percentage of trade accounts receivable of major customers 47.00% 30.00%
The Nielsen Company ("Nielsen") [Member]
   
Concentration Risk [Line Items]    
Percentage of trade accounts receivable of major customers 20.00% 24.00%
Civolution [Member]
   
Concentration Risk [Line Items]    
Percentage of trade accounts receivable of major customers 10.00% 14.00%