Commitments and Contingencies - Summary of Company's Purchases from Manufacturing Cooperatives (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2019	Sep. 30, 2018	Sep. 29, 2019	Sep. 30, 2018
Loss Contingencies [Line Items]
Total purchases from manufacturing cooperatives	$ 74,048	$ 70,948	$ 222,427	$ 210,342
SAC [Member]
Loss Contingencies [Line Items]
Total purchases from manufacturing cooperatives	42,870	38,569	120,309	117,729
Southeastern [Member]
Loss Contingencies [Line Items]
Total purchases from manufacturing cooperatives	$ 31,178	$ 32,379	$ 102,118	$ 92,613