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Accounts Receivable, net - Additional Information (Detail) (Receivable Sales Agreement [Member])	1 Months Ended
	Aug. 31, 2012
Receivable Sales Agreement [Member]
Accounts Receivable Net [Line Items]
Contract period	The initial term of this agreement is for one year, 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

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Initial term of this agreement is for one year, with renewal options, but either party has an option to terminate the agreement pursuant to the terms of the agreement.

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The terms relating to contract.

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