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