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Goodwill (Detail) - USD ($) $ in Thousands	Sep. 28, 2019	Dec. 31, 2018	Apr. 30, 2018
Goodwill [Line Items]
Gross goodwill		$ 217,779
Accumulated goodwill impairment		(81,722)
Goodwill	$ 136,057	136,057
Electronic Systems
Goodwill [Line Items]
Gross goodwill		199,157
Accumulated goodwill impairment		(81,722)
Goodwill	$ 117,435	117,435
Structural Systems
Goodwill [Line Items]
Percentage of fair value in excess of carrying amount	85.00%
Gross goodwill		18,622
Accumulated goodwill impairment		0
Goodwill	$ 18,622	$ 18,622
Certified Thermoplastics Co., LLC
Goodwill [Line Items]
Goodwill			$ 18,600
Certified Thermoplastics Co., LLC \| Structural Systems
Goodwill [Line Items]
Goodwill			$ 18,600