Income Taxes - Reconciliation of Income Tax Expense at Statutory Federal Rate to Actual Income Tax Expense (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 28, 2014	Sep. 29, 2013	Sep. 28, 2014	Sep. 29, 2013
Income Tax Disclosure [Abstract]
Statutory expense			$ 17,474	$ 17,653
State income taxes, net of federal benefit			1,915	2,093
Valuation allowance change			63	(1)
Noncontrolling interest - Piedmont			(1,465)	(1,348)
Manufacturing deduction benefit			(1,893)	(1,678)
Meals and entertainment			918	1,070
Adjustment for uncertain tax positions			(76)	(223)
Adjustment for state tax legislation			0	(2,261)
Other, net			853	(755)
Income tax expense	$ 7,408	$ 4,756	$ 17,789	$ 14,550