Business Segment Information - Segment Assets (Detail) - USD ($) $ in Thousands	Apr. 02, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Total Assets	$ 519,374	$ 557,081
Total Goodwill and Intangibles	190,913	212,461
Operating Segments | Structural Systems
Segment Reporting Information [Line Items]
Total Assets	182,157	179,134
Total Goodwill and Intangibles	4,586	4,866
Operating Segments | Electronic Systems
Segment Reporting Information [Line Items]
Total Assets	325,987	363,227
Total Goodwill and Intangibles	186,327	207,595
Corporate Administration
Segment Reporting Information [Line Items]
Total Assets	$ 11,230	$ 14,720