Commitments and Contingencies (Details) ft² in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2020 USD ($)	Sep. 28, 2019 USD ($)	Sep. 26, 2020 USD ($)	Sep. 28, 2019 USD ($)	Jun. 29, 2020 ft² building	Dec. 31, 2019 USD ($)
Loss Contingencies [Line Items]
Net Revenues	$ 150,371	$ 181,101	$ 471,155	$ 534,162
Cost of Sales	116,906	142,774	368,218	422,076
Facility Fire In Guaymas, Mexico | Damage from Facility Fire
Loss Contingencies [Line Items]
Number of buildings | building					2
Real estate property (in sqft) | ft²					62
Loss contingency, receivable, proceeds			5,000
Facility Fire In Guaymas, Mexico | Damage from Facility Fire | Property, Plant and Equipment
Loss Contingencies [Line Items]
Carrying value of impaired assets	6,800		6,800
Facility Fire In Guaymas, Mexico | Damage from Facility Fire | Inventories
Loss Contingencies [Line Items]
Carrying value of impaired assets	3,400		3,400
Facility Fire In Guaymas, Mexico | Damage from Facility Fire | Revision of Prior Period, Reclassification, Adjustment
Loss Contingencies [Line Items]
Net Revenues	800
Cost of Sales	500
Structural Systems
Loss Contingencies [Line Items]
Net Revenues	46,901	$ 90,513	177,615	$ 270,117
Structural Systems | El Mirage and Monrovia, California
Loss Contingencies [Line Items]
Reserve for estimated liability	1,500		1,500			$ 1,500
Structural Systems | West Covina, California
Loss Contingencies [Line Items]
Reserve for estimated liability	400		400
Structural Systems | West Covina, California | Minimum
Loss Contingencies [Line Items]
Possible loss	400		400
Structural Systems | West Covina, California | Maximum
Loss Contingencies [Line Items]
Possible loss	$ 3,100		$ 3,100