Commitments and Contingencies - Summary of Company's Purchases from Manufacturing Cooperatives (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Apr. 01, 2018
Loss Contingencies [Line Items]
Total purchases from manufacturing cooperatives	$ 71,772	$ 67,245
SAC [Member]
Loss Contingencies [Line Items]
Total purchases from manufacturing cooperatives	37,446	38,076
Southeastern [Member]
Loss Contingencies [Line Items]
Total purchases from manufacturing cooperatives	$ 34,326	$ 29,169