Schedule of Components of Provision (Benefit) for Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 29, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Oct. 01, 2011	Jul. 02, 2011	Apr. 02, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Current tax expense (benefit)
Federal									$ 7,608	$ 2,133	$ 6,204
State									(579)	(223)	(854)
Current Income Tax Expense (Benefit), Total									7,029	1,910	5,350
Deferred tax expense (benefit)
Federal									(260)	(6,044)	(686)
State									(1,191)	(608)	191
Deferred Income Tax Expense (Benefit), Total									(1,451)	(6,652)	(495)
Income tax expense (benefit)	$ 3,183	$ 894	$ 271	$ 1,230	$ (5,082)	$ 415	$ (1,151)	$ 1,076	$ 5,578	$ (4,742)	$ 4,855