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