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Goodwill (Detail) - USD ($) $ in Thousands	3 Months Ended
Goodwill (Detail) - USD ($) $ in Thousands	Mar. 28, 2020	Dec. 31, 2019	Oct. 08, 2019
Goodwill [Line Items]
Gross goodwill		$ 252,639
Accumulated goodwill impairment		(81,722)
Purchase price allocation refinements	$ (27)
Goodwill	$ 170,890	170,917
Electronic Systems
Goodwill [Line Items]
Percentage of fair value in excess of carrying amount	44.00%
Gross goodwill		199,157
Accumulated goodwill impairment		(81,722)
Purchase price allocation refinements	$ 0
Goodwill	$ 117,435	117,435
Structural Systems
Goodwill [Line Items]
Percentage of fair value in excess of carrying amount	85.00%
Gross goodwill		53,482
Accumulated goodwill impairment		0
Purchase price allocation refinements	$ (27)
Goodwill	$ 53,455	$ 53,482
Nobles Worldwide, Inc.
Goodwill [Line Items]
Goodwill			$ 34,833
Nobles Worldwide, Inc. \| Structural Systems
Goodwill [Line Items]
Goodwill			$ 34,800