Commitments and Contingencies - Summary of Company's Purchases from Manufacturing Cooperatives (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 01, 2018	Apr. 02, 2017
Loss Contingencies [Line Items]
Total purchases from manufacturing cooperatives	$ 67,245	$ 56,970
SAC [Member]
Loss Contingencies [Line Items]
Total purchases from manufacturing cooperatives	38,076	33,634
Southeastern [Member]
Loss Contingencies [Line Items]
Total purchases from manufacturing cooperatives	$ 29,169	$ 23,336