Business Segment Information - Segment Assets (Detail) - USD ($) $ in Thousands	Mar. 30, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Total Assets	$ 660,709	$ 644,739
Total Goodwill and Intangibles	245,444	248,149
Operating Segments | Electronic Systems
Segment Reporting Information [Line Items]
Total Assets	414,806	405,743
Total Goodwill and Intangibles	217,518	219,872
Operating Segments | Structural Systems
Segment Reporting Information [Line Items]
Total Assets	231,685	220,993
Total Goodwill and Intangibles	27,926	28,277
Corporate Administration
Segment Reporting Information [Line Items]
Total Assets	$ 14,218	$ 18,003