Revenue Recognition - Summary of Disaggregated Revenue (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 24, 2022	Sep. 25, 2021	Sep. 24, 2022	Sep. 25, 2021
Disaggregation Of Revenue [Line Items]
Total	$ 413,470	$ 348,426	$ 1,232,468	$ 947,073
U.S. Customers [Member]
Disaggregation Of Revenue [Line Items]
Total	380,842	328,315	1,138,683	896,545
Non-U.S. Customers [Member]
Disaggregation Of Revenue [Line Items]
Total	32,628	20,111	93,785	50,528
Powertrain [Member]
Disaggregation Of Revenue [Line Items]
Total	153,773	136,770	462,556	386,732
Chassis [Member]
Disaggregation Of Revenue [Line Items]
Total	174,707	118,273	513,301	302,219
Automotive Body [Member]
Disaggregation Of Revenue [Line Items]
Total	72,717	78,477	215,764	214,180
Hardware [Member]
Disaggregation Of Revenue [Line Items]
Total	$ 12,273	$ 14,906	$ 40,847	$ 43,942