Derivatives - Gains (Losses) on Derivative Financial Instruments (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 04, 2020	Jun. 29, 2019	Jul. 04, 2020	Jun. 29, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in OCI(L) on Derivatives	$ 1,530	$ (1,542)	$ (3,683)	$ (947)
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	1,556	(1,542)	(3,604)	(947)
Amount of Gain or (Loss) Reclassified from Accumulated OCI(L) into Income	(1,506)	$ (1,223)	(2,118)	$ (2,138)
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	(26)		(79)
Amount of Gain or (Loss) Reclassified from Accumulated OCI(L) into Income	$ (87)		$ (87)