Business Segment Information - Segment Assets (Detail) - USD ($) $ in Thousands	Mar. 28, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Total Assets	$ 841,837	$ 790,429
Total Goodwill and Intangibles	305,422	309,279
Operating Segments | Electronic Systems
Segment Reporting Information [Line Items]
Total Assets	431,562	411,981
Total Goodwill and Intangibles	208,097	210,453
Operating Segments | Structural Systems
Segment Reporting Information [Line Items]
Total Assets	335,942	328,718
Total Goodwill and Intangibles	97,325	98,826
Corporate Administration
Segment Reporting Information [Line Items]
Total Assets	$ 74,333	$ 49,730