Goodwill and Other Intangible Assets - Carrying Amount of Goodwill (Detail) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Goodwill [Line Items]
Gross goodwill			$ 239,291,000
Accumulated goodwill impairment			(81,722,000)
Goodwill [Roll Forward]
Goodwill beginning balance		$ 157,569,000
Goodwill impairment	$ (57,200,000)	(57,243,000)	0	$ 0
Transfer to assets held for sale		(17,772,000)
Goodwill ending balance	82,554,000	82,554,000	157,569,000
Structural Systems
Goodwill [Line Items]
Gross goodwill			57,243,000
Accumulated goodwill impairment			0
Goodwill [Roll Forward]
Goodwill beginning balance		57,243,000
Goodwill impairment	(57,241,000)	(57,243,000)
Transfer to assets held for sale		0
Goodwill ending balance	0	0	57,243,000
Electronic Systems
Goodwill [Line Items]
Gross goodwill			182,048,000
Accumulated goodwill impairment			(81,722,000)
Goodwill [Roll Forward]
Goodwill beginning balance		100,326,000
Goodwill impairment		0
Transfer to assets held for sale		(17,772,000)
Goodwill ending balance	$ 82,554,000	$ 82,554,000	$ 100,326,000