Goodwill (Detail) - USD ($) $ in Thousands	Mar. 30, 2019	Dec. 31, 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]
Gross goodwill		18,622
Accumulated goodwill impairment		0
Goodwill	$ 18,622	$ 18,622

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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