Restructuring - Restructuring Costs by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Restructuring Cost and Reserve [Line Items]
Pre-tax charges related to restructuring	$ 212	$ 172	$ 8,544	$ 1,034
Restructuring Plan 2016
Restructuring Cost and Reserve [Line Items]
Pre-tax charges related to restructuring	1,287		14,791
Restructuring Plan 2016 | Corporate, Non-Segment
Restructuring Cost and Reserve [Line Items]
Pre-tax charges related to restructuring	100		1,200
Restructuring Plan 2016 | Severance and benefit related costs
Restructuring Cost and Reserve [Line Items]
Pre-tax charges related to restructuring	146		6,939
Restructuring Plan 2016 | Lease termination costs
Restructuring Cost and Reserve [Line Items]
Pre-tax charges related to restructuring			969
Restructuring Plan 2016 | Relocation and other moving costs
Restructuring Cost and Reserve [Line Items]
Pre-tax charges related to restructuring	66		569
Restructuring Plan 2016 | Other restructuring costs
Restructuring Cost and Reserve [Line Items]
Pre-tax charges related to restructuring	1,075		6,314
Restructuring Plan 2016 | Infrastructure Solutions
Restructuring Cost and Reserve [Line Items]
Pre-tax charges related to restructuring	(31)		3,340
Restructuring Plan 2016 | Infrastructure Solutions | Severance and benefit related costs
Restructuring Cost and Reserve [Line Items]
Pre-tax charges related to restructuring	0		2,256
Restructuring Plan 2016 | Infrastructure Solutions | Lease termination costs
Restructuring Cost and Reserve [Line Items]
Pre-tax charges related to restructuring			0
Restructuring Plan 2016 | Infrastructure Solutions | Relocation and other moving costs
Restructuring Cost and Reserve [Line Items]
Pre-tax charges related to restructuring	0		307
Restructuring Plan 2016 | Infrastructure Solutions | Other restructuring costs
Restructuring Cost and Reserve [Line Items]
Pre-tax charges related to restructuring	(31)		777
Restructuring Plan 2016 | Corrosion Protection
Restructuring Cost and Reserve [Line Items]
Pre-tax charges related to restructuring	178		3,872
Restructuring Plan 2016 | Corrosion Protection | Severance and benefit related costs
Restructuring Cost and Reserve [Line Items]
Pre-tax charges related to restructuring	48		3,182
Restructuring Plan 2016 | Corrosion Protection | Lease termination costs
Restructuring Cost and Reserve [Line Items]
Pre-tax charges related to restructuring			0
Restructuring Plan 2016 | Corrosion Protection | Relocation and other moving costs
Restructuring Cost and Reserve [Line Items]
Pre-tax charges related to restructuring	0		62
Restructuring Plan 2016 | Corrosion Protection | Other restructuring costs
Restructuring Cost and Reserve [Line Items]
Pre-tax charges related to restructuring	130		628
Restructuring Plan 2016 | Energy Services
Restructuring Cost and Reserve [Line Items]
Pre-tax charges related to restructuring	1,140		7,579	$ 7,600
Restructuring Plan 2016 | Energy Services | Severance and benefit related costs
Restructuring Cost and Reserve [Line Items]
Pre-tax charges related to restructuring	98		1,501
Restructuring Plan 2016 | Energy Services | Lease termination costs
Restructuring Cost and Reserve [Line Items]
Pre-tax charges related to restructuring			969
Restructuring Plan 2016 | Energy Services | Relocation and other moving costs
Restructuring Cost and Reserve [Line Items]
Pre-tax charges related to restructuring	66		200
Restructuring Plan 2016 | Energy Services | Other restructuring costs
Restructuring Cost and Reserve [Line Items]
Pre-tax charges related to restructuring	$ 976		$ 4,909