Discontinued Operations - Schedule of Condensed Income Statement (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2012
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Net sales	$ 15,828	$ 46,382
Operating income	2,710	5,807
Other income, net	8	18
Interest expense	(25)	(96)
Income before income taxes	2,693	5,729
Income tax expense	968	2,456
Net income	$ 1,725	$ 3,273