Restructuring - Restructuring Costs by Segment (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]
Pre-tax charges related to restructuring	$ 0	$ 6,797,000
Restructuring Plan 2016
Restructuring Cost and Reserve [Line Items]
Pre-tax charges related to restructuring	$ 0	9,742,000	$ 16,100,000
Restructuring Plan 2016 | Corporate, Non-Segment
Restructuring Cost and Reserve [Line Items]
Pre-tax charges related to restructuring		1,000,000
Restructuring Plan 2016 | Severance and benefit related costs
Restructuring Cost and Reserve [Line Items]
Pre-tax charges related to restructuring		5,641,000
Restructuring Plan 2016 | Lease termination costs
Restructuring Cost and Reserve [Line Items]
Pre-tax charges related to restructuring		969,000
Restructuring Plan 2016 | Relocation and other moving costs
Restructuring Cost and Reserve [Line Items]
Pre-tax charges related to restructuring		120,000
Restructuring Plan 2016 | Other restructuring costs
Restructuring Cost and Reserve [Line Items]
Pre-tax charges related to restructuring		3,012,000
Restructuring Plan 2016 | Infrastructure Solutions
Restructuring Cost and Reserve [Line Items]
Pre-tax charges related to restructuring		2,153,000
Restructuring Plan 2016 | Infrastructure Solutions | Severance and benefit related costs
Restructuring Cost and Reserve [Line Items]
Pre-tax charges related to restructuring		1,912,000
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
Restructuring Plan 2016 | Infrastructure Solutions | Other restructuring costs
Restructuring Cost and Reserve [Line Items]
Pre-tax charges related to restructuring		241,000
Restructuring Plan 2016 | Corrosion Protection
Restructuring Cost and Reserve [Line Items]
Pre-tax charges related to restructuring		2,737,000
Restructuring Plan 2016 | Corrosion Protection | Severance and benefit related costs
Restructuring Cost and Reserve [Line Items]
Pre-tax charges related to restructuring		2,420,000
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
Restructuring Plan 2016 | Corrosion Protection | Other restructuring costs
Restructuring Cost and Reserve [Line Items]
Pre-tax charges related to restructuring		317,000
Restructuring Plan 2016 | Energy Services
Restructuring Cost and Reserve [Line Items]
Pre-tax charges related to restructuring		4,852,000
Restructuring Plan 2016 | Energy Services | Severance and benefit related costs
Restructuring Cost and Reserve [Line Items]
Pre-tax charges related to restructuring		1,309,000
Restructuring Plan 2016 | Energy Services | Lease termination costs
Restructuring Cost and Reserve [Line Items]
Pre-tax charges related to restructuring		969,000
Restructuring Plan 2016 | Energy Services | Relocation and other moving costs
Restructuring Cost and Reserve [Line Items]
Pre-tax charges related to restructuring		120,000
Restructuring Plan 2016 | Energy Services | Other restructuring costs
Restructuring Cost and Reserve [Line Items]
Pre-tax charges related to restructuring		$ 2,454,000