Business Segment Information - Segment Assets (Detail) - USD ($) $ in Thousands	Jun. 27, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Total Assets	$ 841,637	$ 790,429
Total Goodwill and Intangibles	302,131	309,279
Operating Segments | Electronic Systems
Segment Reporting Information [Line Items]
Total Assets	427,750	411,981
Total Goodwill and Intangibles	205,743	210,453
Operating Segments | Structural Systems
Segment Reporting Information [Line Items]
Total Assets	334,789	328,718
Total Goodwill and Intangibles	96,388	98,826
Corporate Administration
Segment Reporting Information [Line Items]
Total Assets	$ 79,098	$ 49,730