Derivatives - Gains (Losses) on Derivative Financial Instruments (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 03, 2020	Sep. 28, 2019	Oct. 03, 2020	Sep. 28, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in OCI(L) on Derivatives	$ 1,563	$ (1,136)	$ (2,120)	$ (2,083)
Aluminum Contracts [Member] | Inventory Classified as Cost of Sales [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in OCI(L) on Derivatives	1,452	(1,136)	(2,152)	(2,083)
Amount of Gain or (Loss) Reclassified from Accumulated OCI(L) into Income	(680)	$ (1,532)	(2,798)	$ (3,670)
MTP Contracts [Member] | Inventory Classified as Cost of Sales [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in OCI(L) on Derivatives	111		32
Amount of Gain or (Loss) Reclassified from Accumulated OCI(L) into Income	$ 148		$ 61