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Accounts Receivable, net - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2013
Customer
Accounts Receivable Net [Line Items]  
Trade receivable payment terms Payment terms of 15 days or less
Number of customers accounted as percentage of accounts receivable 9
Percentage of net receivables 31.00%
Receivable Sales Agreement [Member]
  
Accounts Receivable Net [Line Items]  
Contract period The term of this agreement matures in August 2014, with renewal options, but either party has an option to terminate the agreement pursuant to the terms of the agreement
Contract terms Receive payment from the Bank no later than one business day after the Bank's acceptance of EDC's offer to sell the accounts receivables