Restructuring - Additional Information (Details)	3 Months Ended		6 Months Ended		21 Months Ended
	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) position	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($)	Jan. 04, 2016 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 1,535,000	$ 204,000	$ 8,332,000	$ 862,000
Restructuring Plan 2016
Restructuring Cost and Reserve [Line Items]
Impact on earnings			$ 17,000,000
Expected number of positions eliminated | position			950
Number of positions eliminated, percent			15.30%
Number of terminations during period | position			930
Restructuring charges	3,763,000		$ 13,505,000
Restructuring charges, net of tax			9,100,000
Pre-tax charges (reversals) related to restructuring	3,763,000		13,505,000
Utilized - Non-Cash			508,000
Utilized - Cash			10,719,000
Restructuring Plan 2016 | Corrosion Protection
Restructuring Cost and Reserve [Line Items]
Restructuring charges	957,000		3,694,000
Restructuring Plan 2016 | Infrastructure Solutions
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1,219,000		3,372,000
Restructuring Plan 2016 | Minimum
Restructuring Cost and Reserve [Line Items]
Impact on earnings			15,000,000
Estimated remaining restructuring costs to be incurred	1,500,000		1,500,000		$ 1,500,000	$ 11,000,000
Restructuring Plan 2016 | Maximum
Restructuring Cost and Reserve [Line Items]
Impact on earnings			16,000,000
Estimated remaining restructuring costs to be incurred	15,000,000		$ 15,000,000		15,000,000	$ 13,000,000
Restructuring Plan 2014
Restructuring Cost and Reserve [Line Items]
Number of terminations during period | position			86
Restructuring charges	100,000	5,700,000		9,200,000
Estimated annual savings					10,800,000
Pre-tax charges (reversals) related to restructuring	60,000	5,694,000	$ (120,000)	9,232,000	60,400,000
Restructuring costs, after tax results					44,800,000
Utilized - Non-Cash			356,000	5,637,000	48,300,000
Utilized - Cash			214,000	4,682,000	12,100,000
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		22,200,000		22,200,000
Restructuring Plan 2014 | Infrastructure Solutions
Restructuring Cost and Reserve [Line Items]
Restructuring charges	100,000	5,700,000	100,000	6,500,000
Estimated annual savings					8,400,000
Total pre-tax restructuring charges to date	26,100,000		26,100,000		$ 26,100,000
Employee Severance and Lease Termination | Restructuring Plan 2016
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1,500,000		8,300,000
Employee Severance and Lease Termination | Restructuring Plan 2014
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 0	$ 200,000	$ 100,000	$ 900,000