Carrying Values of Major Classes of Assets and Liabilities Held for Sale included in Condensed Consolidated Balance Sheet (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Other current assets	$ 2,700	$ 3,197
Property, plant and equipment-net		45,892
Other assets		9,679
Total long-term assets held for sale	$ 28,724	$ 55,571