Income Taxes - Reconciliation of Income Tax Expense at Statutory Federal Rate to Actual Income Tax Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Jan. 01, 2017	Jan. 03, 2016
Income Tax Disclosure [Abstract]
Statutory expense	$ 22,052	$ 32,449	$ 34,692
Adjustment for federal tax legislation	(69,014)
Meals and entertainment	2,771	1,879	1,666
Valuation allowance change	2,718	(689)	(1,332)
State income taxes, net of federal benefit	2,029	3,243	3,496
Noncontrolling interest – Piedmont	(1,692)	(2,406)	(2,261)
Adjustment for uncertain tax positions	(521)	(43)	51
Adjustment for state tax legislation		(625)	(1,145)
Manufacturing deduction benefit		(56)	(1,330)
Bargain purchase gain			(704)
Other, net	1,816	2,297	945
Income tax expense (benefit)	$ (39,841)	$ 36,049	$ 34,078
Statutory expense	35.00%	35.00%	35.00%
Adjustment for federal tax legislation	(109.50%)
Meals and entertainment	4.40%	2.00%	1.70%
Valuation allowance change	4.30%	(0.70%)	(1.30%)
State income taxes, net of federal benefit	3.20%	3.50%	3.50%
Noncontrolling interest – Piedmont	(2.70%)	(2.60%)	(2.30%)
Adjustment for uncertain tax positions	(0.80%)		0.10%
Adjustment for state tax legislation		(0.70%)	(1.20%)
Manufacturing deduction benefit		(0.10%)	(1.30%)
Bargain purchase gain			(0.70%)
Other, net	2.90%	2.50%	0.90%
Income tax expense (benefit)	(63.20%)	38.90%	34.40%