Business Segment Information - Financial Information by Reportable Segment (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Oct. 01, 2016	Jul. 02, 2016	Apr. 02, 2016	Dec. 31, 2015	Oct. 03, 2015	Jul. 04, 2015	Apr. 04, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Net Revenues	$ 142,486	$ 132,571	$ 133,437	$ 142,148	$ 156,576	$ 161,670	$ 174,845	$ 172,920	$ 550,642	$ 666,011	$ 742,045
Segment Operating Income (Loss)									45,480	(57,482)	69,548
Corporate General and Administrative Expenses									(16,912)	(17,827)	(17,781)
Operating Income (Loss)									28,568	(75,309)	51,767
Depreciation and amortization									22,860	26,846	29,024
Capital Expenditures									18,693	15,988	18,554
Goodwill impairment					57,200				0	57,243	0
Intangible asset impairment					32,900				0	32,937	0
Workers' compensation expense											1,200
Structural Systems
Segment Reporting Information [Line Items]
Goodwill impairment					$ 57,200					57,200
Forward loss provision						$ 10,000				10,000
Operating Segments | Structural Systems
Segment Reporting Information [Line Items]
Net Revenues									246,465	273,319	319,956
Segment Operating Income (Loss)									16,497	(53,010)	34,949
Depreciation and amortization									8,688	9,417	10,959
Capital Expenditures									15,661	11,559	12,742
Operating Segments | Electronic Systems
Segment Reporting Information [Line Items]
Net Revenues									304,177	392,692	422,089
Segment Operating Income (Loss)									28,983	(4,472)	34,599
Depreciation and amortization									14,087	17,267	17,928
Capital Expenditures									3,032	4,419	5,782
Corporate Administration
Segment Reporting Information [Line Items]
Depreciation and amortization									85	162	137
Capital Expenditures									$ 0	$ 10	$ 30