Joint Ventures - Summarized Information for Joint Ventures (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Equity Method Investments and Joint Ventures [Abstract]
Net sales	$ 12,623	$ 15,880	$ 23,288	$ 28,685
Gross profit (loss)	1,488	2,608	2,592	4,433
Net income (loss)	$ 1,524	$ 2,610	$ 2,582	$ 3,924