Income Taxes - Reconciliation of Income Tax Expense (benefit) at Statutory Federal Rate to Actual Income Tax Expense (benefit) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2018	Dec. 31, 2017	Jan. 01, 2017
Income Tax Disclosure [Abstract]
Statutory (income) / expense	$ (2,790)	$ 22,052	$ 32,449
Nondeductible compensation	2,851	230	191
Meals, entertainment and travel expense	2,734	3,684	2,886
Adjustment for federal tax legislation	(1,989)	(69,014)
Valuation allowance change	1,566	2,718	(689)
Noncontrolling interest – Piedmont	(1,238)	(1,692)	(2,406)
Adjustment for uncertain tax positions	694	(521)	(43)
State income taxes, net of federal benefit	(376)	2,029	3,243
Other, net	417	673	418
Income tax expense (benefit)	$ 1,869	$ (39,841)	$ 36,049
Statutory (income) / expense	21.00%	35.00%	35.00%
Nondeductible compensation	(21.50%)	0.40%	0.20%
Meals, entertainment and travel expense	(20.60%)	5.80%	3.00%
Adjustment for federal tax legislation	15.00%	(109.50%)
Valuation allowance change	(11.80%)	4.30%	(0.70%)
Noncontrolling interest – Piedmont	9.30%	(2.70%)	(2.60%)
Adjustment for uncertain tax positions	(5.20%)	(0.80%)
State income taxes, net of federal benefit	2.80%	3.20%	3.50%
Other, net	(3.10%)	1.10%	0.50%
Income tax expense (benefit)	(14.10%)	(63.20%)	38.90%