Revenue Recognition - Summary of Disaggregated Revenue (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2023	Jun. 25, 2022	Jul. 01, 2023	Jun. 25, 2022
Disaggregation Of Revenue [Line Items]
Total	$ 480,568	$ 417,419	$ 947,306	$ 818,998
Net sales to U.S. customers
Disaggregation Of Revenue [Line Items]
Total	438,300	384,223	868,993	757,841
Net sales to non-U.S. customers
Disaggregation Of Revenue [Line Items]
Total	42,268	33,196	78,313	61,157
Powertrain
Disaggregation Of Revenue [Line Items]
Total	181,684	156,555	352,719	308,783
Chassis
Disaggregation Of Revenue [Line Items]
Total	188,922	177,732	377,786	338,594
Motor Vehicle body
Disaggregation Of Revenue [Line Items]
Total	94,466	69,767	185,625	143,047
Hardware
Disaggregation Of Revenue [Line Items]
Total	$ 15,496	$ 13,365	$ 31,176	$ 28,574