Business Segment Information - Financial Information by Reportable Segment (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 02, 2016	Apr. 04, 2015
Segment Reporting Information [Line Items]
Net Revenues	$ 142,148	$ 172,920
Segment Operating Income	9,777	8,423
Operating Income	4,293	3,627
Depreciation and Amortization Expenses	5,855	6,914
Capital Expenditures	2,401	4,828
Operating Segments | Structural Systems
Segment Reporting Information [Line Items]
Net Revenues	64,017	72,058
Segment Operating Income	2,724	2,138
Depreciation and Amortization Expenses	2,057	2,513
Capital Expenditures	2,054	3,334
Operating Segments | Electronic Systems
Segment Reporting Information [Line Items]
Net Revenues	78,131	100,862
Segment Operating Income	7,053	6,285
Depreciation and Amortization Expenses	3,761	4,359
Capital Expenditures	347	1,490
Corporate Administration
Segment Reporting Information [Line Items]
Corporate General and Administrative Expenses	(5,484)	(4,796)
Depreciation and Amortization Expenses	37	42
Capital Expenditures	$ 0	$ 4