Income Taxes - Reconciliation of Income Tax Expense at Statutory Federal Rate to Actual Income Tax Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 27, 2015	Sep. 28, 2014	Sep. 27, 2015	Sep. 28, 2014
Income Tax Disclosure [Abstract]
Statutory expense			$ 31,712	$ 17,474
State income taxes, net of federal benefit			3,268	1,915
Valuation allowance change			(1,089)	63
Noncontrolling interest – Piedmont			(1,764)	(1,465)
Manufacturing deduction benefit			(1,254)	(1,893)
Meals and entertainment			906	918
Adjustment for uncertain tax positions			(179)	(76)
Adjustment for state tax legislation			(1,169)	0
Other, net			743	853
Income tax expense	$ 12,099	$ 7,408	$ 31,174	$ 17,789