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 of increase (decrease), classified as other, of an asset representing the future economic benefits 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		6 Months Ended
Goodwill (Detail) - USD ($) $ in Thousands	Jun. 26, 2020	Jun. 28, 2019	Jun. 26, 2020	Jun. 28, 2019	Dec. 31, 2019
Goodwill [Line Items]
Impairment charge	$ 0	$ 0	$ (9,053)	$ 0
Other			43
Goodwill	70,001		70,001		$ 79,011
Performance Alloys and Composites
Goodwill [Line Items]
Impairment charge			0
Other			0
Goodwill	1,899		1,899		1,899
Advanced Materials
Goodwill [Line Items]
Impairment charge			0
Other			43
Goodwill	50,233		50,233		50,190
Precision Coatings
Goodwill [Line Items]
Impairment charge			(9,053)
Other			0
Goodwill	$ 17,869		$ 17,869		$ 26,922