Derivative Financial Instruments - Summary of Pre-Tax Changes in Fair Value (Detail) - Commodity Contract [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jul. 01, 2018	Jun. 30, 2019	Jul. 01, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Total gain (loss)	$ (4,940)	$ 297	$ 1,680	$ (2,670)
Cost of Sales [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Total gain (loss)	(4,874)	249	(969)	(2,516)
Selling, Delivery and Administrative Expenses [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Total gain (loss)	$ (66)	$ 48	$ 2,649	$ (154)