Income Taxes - Reconciliation of Income Tax Expense at Statutory Federal Rate to Actual Income Tax Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2015	Jun. 29, 2014	Jun. 28, 2015	Jun. 29, 2014
Income Tax Disclosure [Abstract]
Statutory expense			$ 17,832	$ 10,085
State income taxes, net of federal benefit			1,823	1,105
Valuation allowance change			(10)	104
Noncontrolling interest – Piedmont			(1,038)	(862)
Manufacturing deduction benefit			(851)	(1,273)
Meals and entertainment			664	567
Adjustment for uncertain tax positions			296	316
Other, net			359	339
Income tax expense	$ 17,562	$ 8,589	$ 19,075	$ 10,381