Revenue Recognition - Summary of Disaggregated Revenue (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 25, 2022	Jun. 26, 2021	Jun. 25, 2022	Jun. 26, 2021
Disaggregation Of Revenue [Line Items]
Total	$ 417,419	$ 310,635	$ 818,998	$ 598,647
U.S. Customers [Member]
Disaggregation Of Revenue [Line Items]
Total	384,223	295,081	757,841	568,231
Non-U.S. Customers [Member]
Disaggregation Of Revenue [Line Items]
Total	33,196	15,554	61,157	30,416
Powertrain [Member]
Disaggregation Of Revenue [Line Items]
Total	156,555	128,811	308,783	249,933
Chassis [Member]
Disaggregation Of Revenue [Line Items]
Total	177,732	98,551	338,594	184,038
Automotive Body [Member]
Disaggregation Of Revenue [Line Items]
Total	69,767	66,970	143,047	135,632
Hardware [Member]
Disaggregation Of Revenue [Line Items]
Total	$ 13,365	$ 16,303	$ 28,574	$ 29,044