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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		6 Months Ended
	Jun. 29, 2014	Jun. 30, 2013	Jun. 29, 2014	Jun. 30, 2013
Income Tax Disclosure [Abstract]
Statutory expense			$ 10,085	$ 9,657
State income taxes, net of federal benefit			1,105	1,143
Valuation allowance change			104	94
Noncontrolling interest - Piedmont			(862)	(672)
Manufacturing deduction benefit			(1,273)	(926)
Meals and entertainment			567	581
Adjustment for uncertain tax positions			316	391
Other, net			339	(474)
Income tax expense	$ 8,589	$ 7,354	$ 10,381	$ 9,794

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.

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Amount of the difference between reported income tax expense (benefit) and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deduction for qualified production activity.

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