Income Taxes - Reconciliation of Income Tax Expense at Statutory Federal Rate to Actual Income Tax Expense (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 28, 2014	Dec. 29, 2013	Dec. 30, 2012
Income Tax Disclosure [Abstract]
Statutory expense	$ 19,474	$ 15,485	$ 18,672
State income taxes, net of federal benefit	2,133	1,811	2,191
Noncontrolling interest - Piedmont	(1,835)	(1,674)	(1,694)
Adjustment for uncertain tax positions	30	(167)	761
Adjustment for state tax legislation	0	(2,261)	0
Valuation allowance change	1,203	321	1,767
Capital loss carryover	(854)	0	0
Manufacturing deduction benefit	(1,470)	(1,995)	(1,330)
Meals and entertainment	1,204	1,127	1,184
Other, net	(349)	(505)	338
Income tax expense	$ 19,536us-gaap_IncomeTaxExpenseBenefit	$ 12,142us-gaap_IncomeTaxExpenseBenefit	$ 21,889us-gaap_IncomeTaxExpenseBenefit

Income Tax Reconciliation Capital Loss Carry Over

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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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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from 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 noncontrolling interest income (loss) exempt from income taxes.

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