Summarized Information for Joint Ventures (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Schedule of Equity Method Investments [Line Items]
Net sales	$ 12,805	$ 18,045
Gross profit (loss)	1,825	4,038
Net income (loss)	$ 1,313	$ 2,856