Restructuring Activities (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Apr. 01, 2017	Dec. 31, 2019	Dec. 31, 2017
Restructuring Reserve [Roll Forward]
Beginning balance	$ 2,725
Restructuring Charges	2,173	$ 0
Ending balance	2,138			$ 2,725
Severance and benefits
Restructuring Reserve [Roll Forward]
Beginning balance	2,659
Ending balance	1,843			2,659
Professional service fees
Restructuring Reserve [Roll Forward]
Beginning balance	0
Ending balance	215			0
Modification of stock-based compensation awards
Restructuring Reserve [Roll Forward]
Beginning balance	0
Ending balance	0			0
Lease termination
Restructuring Reserve [Roll Forward]
Beginning balance	66
Ending balance	80			66
Property and equipment impairment due to restructuring
Restructuring Reserve [Roll Forward]
Beginning balance	0
Ending balance	0			0
Electronic Systems
Restructuring Cost and Reserve [Line Items]
Accrued severance and loss on early exit	1,000
Electronic Systems | Severance and benefits
Restructuring Reserve [Roll Forward]
Restructuring Charges	1,600
Electronic Systems | Professional service fees
Restructuring Reserve [Roll Forward]
Restructuring Charges	100
Structural Systems
Restructuring Cost and Reserve [Line Items]
Inventory Write-down	500
Accrued severance and loss on early exit	800
Structural Systems | Severance and benefits
Restructuring Reserve [Roll Forward]
Restructuring Charges	2,100
Structural Systems | Professional service fees
Restructuring Reserve [Roll Forward]
Restructuring Charges	100
Corporate Segment
Restructuring Cost and Reserve [Line Items]
Accrued severance and loss on early exit	300
Corporate Segment | Severance and benefits
Restructuring Reserve [Roll Forward]
Restructuring Charges	400
Corporate Segment | Modification of stock-based compensation awards
Restructuring Reserve [Roll Forward]
Restructuring Charges	1,500
Restructuring Plan, 2017
Restructuring Reserve [Roll Forward]
Restructuring Charges	2,173			$ 8,800
Cash Payments	(1,578)
Non-Cash Payments	(1,182)
Change in Estimates	0
Restructuring Plan, 2017 | Severance and benefits
Restructuring Reserve [Roll Forward]
Restructuring Charges	755
Cash Payments	(1,571)
Non-Cash Payments	0
Change in Estimates	0
Restructuring Plan, 2017 | Professional service fees
Restructuring Reserve [Roll Forward]
Restructuring Charges	215
Cash Payments	0
Non-Cash Payments	0
Change in Estimates	0
Restructuring Plan, 2017 | Modification of stock-based compensation awards
Restructuring Reserve [Roll Forward]
Restructuring Charges	105
Cash Payments	0
Non-Cash Payments	(105)
Change in Estimates	0
Restructuring Plan, 2017 | Lease termination
Restructuring Reserve [Roll Forward]
Restructuring Charges	21
Cash Payments	(7)
Non-Cash Payments	0
Change in Estimates	0
Restructuring Plan, 2017 | Property and equipment impairment due to restructuring
Restructuring Reserve [Roll Forward]
Restructuring Charges	1,077
Cash Payments	0
Non-Cash Payments	(1,077)
Change in Estimates	0
Restructuring Plan, 2017 | Structural Systems | Property and equipment impairment due to restructuring
Restructuring Reserve [Roll Forward]
Non-Cash Payments	(4,700)
Minimum | Restructuring Plan, 2017
Restructuring Cost and Reserve [Line Items]
Expected restructuring cost	20,000
Maximum | Restructuring Plan, 2017
Restructuring Cost and Reserve [Line Items]
Expected restructuring cost	$ 22,000
Scenario, Forecast | Restructuring Plan, 2017
Restructuring Cost and Reserve [Line Items]
Effect on future earnings, amount			$ 14,000