Business Segment Information - Segment Assets (Detail) - USD ($) $ in Thousands	Jul. 02, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Total Assets	$ 520,299	$ 557,081
Total Goodwill and Intangibles	188,651	212,461
Operating Segments | Structural Systems
Segment Reporting Information [Line Items]
Total Assets	182,786	179,134
Total Goodwill and Intangibles	4,306	4,866
Operating Segments | Electronic Systems
Segment Reporting Information [Line Items]
Total Assets	324,176	363,227
Total Goodwill and Intangibles	184,345	207,595
Corporate Administration
Segment Reporting Information [Line Items]
Total Assets	$ 13,337	$ 14,720