Restructuring - Additional Information (Details) $ in Thousands	3 Months Ended		18 Months Ended
	Mar. 31, 2016 USD ($) position	Mar. 31, 2015 USD ($)	Mar. 31, 2016 USD ($)	Jan. 04, 2016 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 6,797	$ 658
Restructuring Plan 2016
Restructuring Cost and Reserve [Line Items]
Impact on earnings	$ 15,000
Expected number of positions eliminated | position	900
Number of positions eliminated, percent	14.50%
Number of terminations during period | position	705
Utilized - Non-Cash	$ 0
Utilized - Cash	6,671
Restructuring charges	9,742
Restructuring charges, net of tax	6,600
Restructuring Plan 2016 | Corrosion Protection
Restructuring Cost and Reserve [Line Items]
Restructuring charges	2,737
Restructuring Plan 2016 | Infrastructure Solutions
Restructuring Cost and Reserve [Line Items]
Restructuring charges	2,153
Restructuring Plan 2016 | Minimum
Restructuring Cost and Reserve [Line Items]
Impact on earnings	15,000
Estimated remaining restructuring costs to be incurred	11,000		$ 11,000	$ 7,000
Restructuring Plan 2016 | Maximum
Restructuring Cost and Reserve [Line Items]
Impact on earnings	16,000
Estimated remaining restructuring costs to be incurred	$ 13,000		13,000	$ 9,000
Restructuring Plan 2014
Restructuring Cost and Reserve [Line Items]
Number of terminations during period | position	86
Utilized - Non-Cash	$ 364	2,448	48,300
Utilized - Cash	45	1,520	12,000
Restructuring charges	(200)	800
Estimated annual savings			10,800
Pre-tax charges (reversals) related to restructuring	(180)	3,538	60,300
Restructuring costs, after tax results			44,800
Restructuring Plan 2014 | Corrosion Protection
Restructuring Cost and Reserve [Line Items]
Estimated annual savings			2,400
Total pre-tax restructuring charges to date	22,200		22,200
Restructuring Plan 2014 | Infrastructure Solutions
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(200)	800
Estimated annual savings			8,400
Total pre-tax restructuring charges to date	26,100		$ 26,100
Employee Severance and Lease Termination | Restructuring Plan 2016
Restructuring Cost and Reserve [Line Items]
Restructuring charges	6,700
Employee Severance and Lease Termination | Restructuring Plan 2014
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 100	$ 700