Customer Lists, Net - Other Identifiable Intangible Assets (Detail) - Customer lists, net - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 29, 2019
Finite-Lived Intangible Assets [Line Items]
Customer lists at cost	$ 25,288	$ 25,288
Less: Accumulated amortization	12,484	10,645
Total other identifiable intangible assets, net	$ 12,804	$ 14,643