Leases - Summary of Balances Related to Lease Portfolio within Condensed Consolidated Statement of Operations (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2019		Jul. 01, 2018	Jun. 30, 2019		Jul. 01, 2018
Cost of Sales [Member]
Lessee Disclosure [Line Items]
Depreciation expense from capital leases	$ 354	[1]	$ 300	$ 707	[1]	$ 700
Selling, Delivery and Administrative Expenses [Member]
Lessee Disclosure [Line Items]
Depreciation expense from capital leases	1,137	[1]	1,200	2,276	[1]	2,300
Interest Expense, Net [Member]
Lessee Disclosure [Line Items]
Interest payments on capital lease obligations	$ 715	[2]	$ 900	$ 1,417	[2]	$ 1,800

[1] During the second quarter of 2018, the Company had depreciation expense from capital leases of $0.3 million and $1.2 million in cost of sales and SD&A expenses, respectively. During the first half of 2018, the Company had depreciation expense from capital leases of $0.7 million and $2.3 million in cost of sales and SD&A expenses, respectively.

[2] The Company had interest payments on capital lease obligations of $0.9 million during the second quarter of 2018 and $1.8 million during the first half of 2018.