Revenue Recognition - Summary of Disaggregated Net Sales (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 25, 2021	Dec. 26, 2020	Dec. 28, 2019
Disaggregation Of Revenue [Line Items]
Net Sales	$ 1,345,249	$ 1,092,748	$ 991,329
U.S. Customers [Member]
Disaggregation Of Revenue [Line Items]
Net Sales	1,269,050	1,031,183	929,908
Non-U.S. Customers [Member]
Disaggregation Of Revenue [Line Items]
Net Sales	76,199	61,565	61,421
Powertrain [Member]
Disaggregation Of Revenue [Line Items]
Net Sales	539,235	442,221	395,975
Chassis [Member]
Disaggregation Of Revenue [Line Items]
Net Sales	458,986	324,399	297,350
Automotive Body [Member]
Disaggregation Of Revenue [Line Items]
Net Sales	288,599	266,699	251,506
Hardware [Member]
Disaggregation Of Revenue [Line Items]
Net Sales	$ 58,429	$ 59,429	$ 46,498