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Goodwill (Detail) - USD ($) $ in Thousands	9 Months Ended
Goodwill (Detail) - USD ($) $ in Thousands	Sep. 29, 2018	Dec. 31, 2017	Jan. 01, 2017
Goodwill [Line Items]
Gross goodwill			$ 199,157
Accumulated goodwill impairment		$ (81,722)
Goodwill at period start	$ 117,435
Goodwill from acquisition during the period	18,334
Goodwill at period end	135,769
Structural Systems
Goodwill [Line Items]
Gross goodwill			0
Accumulated goodwill impairment		0
Goodwill at period start	0
Goodwill from acquisition during the period	18,334
Goodwill at period end	18,334
Electronic Systems
Goodwill [Line Items]
Gross goodwill			$ 199,157
Accumulated goodwill impairment		$ (81,722)
Goodwill at period start	117,435
Goodwill from acquisition during the period	0
Goodwill at period end	$ 117,435