Goodwill (Detail) - USD ($) $ in Thousands	6 Months Ended
Jun. 27, 2020	Dec. 31, 2019
Goodwill [Line Items]
Gross goodwill		$ 252,639
Accumulated goodwill impairment		(81,722)
Balance at December 31, 2019	$ 170,917
Purchase price allocation refinements	(10)
Balance at June 27, 2020	170,907
Electronic Systems
Goodwill [Line Items]
Gross goodwill		199,157
Accumulated goodwill impairment		(81,722)
Balance at December 31, 2019	117,435
Purchase price allocation refinements	0
Balance at June 27, 2020	117,435
Structural Systems
Goodwill [Line Items]
Gross goodwill		53,482
Accumulated goodwill impairment		$ 0
Balance at December 31, 2019	53,482
Purchase price allocation refinements	(10)
Balance at June 27, 2020	$ 53,472

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount before accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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