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Concentration of Risks and Uncertainties - Additional Information (Detail)	1 Months Ended
	Jul. 31, 2010 Bankruptcy protection	Nov. 30, 2010 Mill closures due to economic reasons
Concentration Risk [Line Items]
Period of risk concentration	18 months	One year

Description of risks that arise due to the volume of business transacted with a particular customer. At a minimum, the description informs financial statement users of the general nature of the risk, but excludes "Information about Major Customers" that may be disclosed elsewhere (for instance, segment disclosures).

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