Summary of Results of Discontinued Operations (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales	$ 0	$ 13,255	$ 21,894
Income before income taxes	0	1,374	1,155
Income tax expense	0	499	415
Income from discontinued operations	0	875	740
Gain on sale of discontinued operations, net of tax	0	3,857	0
Income from discontinued operations, net of tax	$ 0	$ 4,732	$ 740