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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Goodwill (Detail) - USD ($) $ in Thousands	3 Months Ended
Goodwill (Detail) - USD ($) $ in Thousands	Mar. 27, 2020	Mar. 29, 2019	Dec. 31, 2019
Goodwill [Line Items]
Impairment charge	$ (9,053)	$ 0
Other	(126)
Goodwill	69,832		$ 79,011
Performance Alloys and Composites
Goodwill [Line Items]
Impairment charge	0
Other	0
Goodwill	1,899		1,899
Advanced Materials
Goodwill [Line Items]
Impairment charge	0
Other	(126)
Goodwill	50,064		50,190
Precision Coatings
Goodwill [Line Items]
Impairment charge	(9,053)
Other	0
Goodwill	$ 17,869		$ 26,922