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Accounts Receivable, net - Additional Information (Detail) (Receivable Sales Agreement [Member])
3 Months Ended
Mar. 31, 2014
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