Restructuring - Additional Information (Details)	3 Months Ended		9 Months Ended		21 Months Ended
	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) employee headcount	Sep. 30, 2015 USD ($)	Jun. 30, 2016 USD ($)	Oct. 06, 2014 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 212,000	$ 172,000	$ 8,544,000	$ 1,034,000
Restructuring Plan 2016
Restructuring Cost and Reserve [Line Items]
Impact on earnings			$ 17,000,000
Expected number of positions eliminated | employee			960
Number of positions eliminated, percent			15.50%
Restructuring charges	1,287,000		$ 14,791,000
Restructuring charges, net of tax			9,700,000
Pre-tax charges (reversals) related to restructuring	1,287,000		14,791,000
Utilized - Non-Cash			765,000
Utilized - Cash			12,922,000
Restructuring Plan 2016 | Corrosion Protection
Restructuring Cost and Reserve [Line Items]
Restructuring charges	178,000		3,872,000
Restructuring Plan 2016 | Infrastructure Solutions
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(31,000)		3,340,000
Restructuring Plan 2016 | Minimum
Restructuring Cost and Reserve [Line Items]
Estimated remaining restructuring costs to be incurred	700,000		700,000
Restructuring Plan 2016 | Maximum
Restructuring Cost and Reserve [Line Items]
Estimated remaining restructuring costs to be incurred	15,500,000		15,500,000
Restructuring Plan 2014
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(400,000)	1,500,000	(500,000)	10,700,000
Estimated annual savings			$ 10,800,000
Number of terminations during period | headcount			86
Pre-tax charges (reversals) related to restructuring	(363,000)	1,498,000	$ (483,000)	10,730,000	$ 60,000,000
Restructuring costs, after tax results					44,600,000
Utilized - Non-Cash			4,046,000	8,695,000	48,300,000
Utilized - Cash			214,000	5,416,000	$ 11,700,000
Restructuring Plan 2014 | Corrosion Protection
Restructuring Cost and Reserve [Line Items]
Estimated annual savings			2,400,000
Total pre-tax restructuring charges to date						$ 22,200,000
Restructuring Plan 2014 | Infrastructure Solutions
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(400,000)	1,400,000	(500,000)	7,900,000
Estimated annual savings			8,400,000
Total pre-tax restructuring charges to date						$ 26,100,000
Employee Severance and Lease Termination | Restructuring Plan 2016
Restructuring Cost and Reserve [Line Items]
Restructuring charges	200,000		8,500,000
Employee Severance and Lease Termination | Restructuring Plan 2014
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 0	$ 200,000	$ 100,000	$ 1,000,000