Discontinued Operations - Schedule of Condensed Income Statement (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended				12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2012	Dec. 31, 2011
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Net sales					$ 60,722	$ 59,021
Income from operations					7,364	9,061
Income before taxes					7,284	9,045
Income tax expense					3,484	4,974
Income from discontinued operations, net of tax					3,800	4,071
Gain on sale					23,674
Income tax expense					5,581
Gain on sale discontinued operations, net of tax					18,093
Total discontinued operations, net of tax					21,893	4,071
Noncontrolling interest in income from discontinued operations, net of tax					494	542
Noncontrolling interest in gain on sale of discontinued operations, net of tax					3,593
Total noncontrolling interest in discontinued operations, net of tax					4,087	542
Total discontinued operations, net of tax and noncontrolling interest	$ 14,959	$ 1,499	$ 774	$ 574	$ 17,806	$ 3,529