Commitments and Contingencies - Summary of Company's Purchases from Manufacturing Cooperatives (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2017	Oct. 02, 2016	Oct. 01, 2017	Oct. 02, 2016
Loss Contingencies [Line Items]
Total purchases from manufacturing cooperatives	$ 66,611	$ 60,361	$ 191,709	$ 173,402
SAC [Member]
Loss Contingencies [Line Items]
Total purchases from manufacturing cooperatives	37,267	39,831	111,408	115,563
Southeastern [Member]
Loss Contingencies [Line Items]
Total purchases from manufacturing cooperatives	$ 29,344	$ 20,530	$ 80,301	$ 57,839