Revenue Recognition - Summary of Disaggregated Revenue (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 24, 2022	Sep. 30, 2023	Sep. 24, 2022
Disaggregation Of Revenue [Line Items]
Total	$ 488,186	$ 413,470	$ 1,435,492	$ 1,232,468
Net sales to U.S. customers
Disaggregation Of Revenue [Line Items]
Total	448,360	380,842	1,317,353	1,138,683
Net sales to non-U.S. customers
Disaggregation Of Revenue [Line Items]
Total	39,826	32,628	118,139	93,785
Powertrain
Disaggregation Of Revenue [Line Items]
Total	193,493	153,773	546,212	462,556
Chassis
Disaggregation Of Revenue [Line Items]
Total	181,723	174,707	559,509	513,301
Motor Vehicle body
Disaggregation Of Revenue [Line Items]
Total	97,843	72,717	283,468	215,764
Hardware
Disaggregation Of Revenue [Line Items]
Total	$ 15,127	$ 12,273	$ 46,303	$ 40,847