Discontinued Operations - Revenues and Components of Net Income Related to Discontinued Operations (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 28, 2013	Jun. 29, 2012	Jun. 28, 2013	Jun. 29, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Add : Gain on disposal, net of tax			$ 14,819
Income (loss) from discontinued operations, net of taxes	(396)	3,892	15,528	5,099
HFC business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue		10,574	9,556	21,856
Operating income	(319)	897	515	2,123
Add : Benefit from income taxes	(60)	(2,995)	(194)	(2,976)
Add : Gain on disposal, net of tax	(137)		14,819
Income (loss) from discontinued operations, net of taxes	$ (396)	$ 3,892	$ 15,528	$ 5,099