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Classification of Assets and Liabilities Held for Sale (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Held for Sale
Current assets	$ 0	$ 809	$ 0
Property, plant & equipment, net	12,929	14,274	0
Total assets held for sale	12,929	15,083	0
Noncurrent liabilities	0	801	0
Total liabilities of assets held for sale	$ 0	$ 801	$ 0

Liability (such as a mortgage) related to a disposal group that is held for sale and anticipated to be sold in less than one year. The liability is expected to be discharged as part of the plan of sale for the asset.

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