Inventories (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Inventories [Line Items]
Inventories-gross	$ 120,966	$ 110,087
Impaired inventory	(32,154)	(31,360)
Inventory, Gross, Total	88,812	78,727
Inventories included in other assets	(3,764)	(1,426)
Inventory Net Continuing And Discontinued Operations, Total	85,048	77,301
Inventories classified as assets held for sale	(85,048)
Inventories, as reported		$ 77,301