Customer Lists and Other Identifiable Intangible Assets, Net - Reconciliation of Activity for Other Identifiable Intangible Assets (Detail) - Customer Lists and Other Identifiable Intangible Assets [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Apr. 01, 2018
Finite Lived Intangible Assets [Line Items]
Total Other Identifiable Intangible Assets, Beginning Balance	$ 16,482	$ 18,320
Additional accumulated amortization	(460)	(459)
Total Other Identifiable Intangible Assets, Ending Balance	$ 16,022	$ 17,861