Restructuring Restructuring Reserve by Type of Cost (Details) (USD $)	12 Months Ended
	Dec. 31, 2014
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	$ 49,518,000
Restructuring and Related Costs, Non-Cash Charges	21,108,000
Payments for Restructuring	5,600,000
Definite-lived Intangible Asset Impairment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	10,896,000
Impaired Long-Lived Assets Held and Used, Asset Name [Domain]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	11,871,000
Infrastructure Solutions [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	27,284,000
Restructuring and Related Costs, Non-Cash Charges	21,108,000
Payments for Restructuring	5,600,000
Infrastructure Solutions [Member] | Definite-lived Intangible Asset Impairment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	0
Infrastructure Solutions [Member] | Impaired Long-Lived Assets Held and Used, Asset Name [Domain]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	533,000
Corrosion Protection [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	22,234,000
Restructuring and Related Costs, Non-Cash Charges	0
Payments for Restructuring	0
Corrosion Protection [Member] | Definite-lived Intangible Asset Impairment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	10,896,000
Corrosion Protection [Member] | Impaired Long-Lived Assets Held and Used, Asset Name [Domain]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	11,338,000
Cost of Sales [Member] | Infrastructure Solutions [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	4,348,000
Restructuring and Related Costs, Non-Cash Charges	2,774,000
Payments for Restructuring	1,100,000
Cost of Sales [Member] | Infrastructure Solutions [Member] | Definite-lived Intangible Asset Impairment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	0
Cost of Sales [Member] | Infrastructure Solutions [Member] | Impaired Long-Lived Assets Held and Used, Asset Name [Domain]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	498,000
Cost of Sales [Member] | Corrosion Protection [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	11,338,000
Restructuring and Related Costs, Non-Cash Charges	0
Payments for Restructuring	0
Cost of Sales [Member] | Corrosion Protection [Member] | Definite-lived Intangible Asset Impairment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	0
Cost of Sales [Member] | Corrosion Protection [Member] | Impaired Long-Lived Assets Held and Used, Asset Name [Domain]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	11,338,000
Operating Expense [Member] | Infrastructure Solutions [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	20,555,000
Restructuring and Related Costs, Non-Cash Charges	17,544,000
Payments for Restructuring	3,000,000
Operating Expense [Member] | Infrastructure Solutions [Member] | Definite-lived Intangible Asset Impairment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	0
Operating Expense [Member] | Infrastructure Solutions [Member] | Impaired Long-Lived Assets Held and Used, Asset Name [Domain]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	35,000
Restructuring Charges [Member] | Infrastructure Solutions [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	687,000
Restructuring and Related Costs, Non-Cash Charges	0
Payments for Restructuring	700,000
Restructuring Charges [Member] | Infrastructure Solutions [Member] | Definite-lived Intangible Asset Impairment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	0
Restructuring Charges [Member] | Infrastructure Solutions [Member] | Impaired Long-Lived Assets Held and Used, Asset Name [Domain]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	0
Other Expense [Member] | Infrastructure Solutions [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	1,694,000
Restructuring and Related Costs, Non-Cash Charges	790,000
Payments for Restructuring	900,000
Other Expense [Member] | Infrastructure Solutions [Member] | Definite-lived Intangible Asset Impairment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	0
Other Expense [Member] | Infrastructure Solutions [Member] | Impaired Long-Lived Assets Held and Used, Asset Name [Domain]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	0
Definite-lived Intangible Asset Impairment [Member] | Corrosion Protection [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	10,896,000
Restructuring and Related Costs, Non-Cash Charges	0
Payments for Restructuring	0
Definite-lived Intangible Asset Impairment [Member] | Corrosion Protection [Member] | Definite-lived Intangible Asset Impairment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	10,896,000
Definite-lived Intangible Asset Impairment [Member] | Corrosion Protection [Member] | Impaired Long-Lived Assets Held and Used, Asset Name [Domain]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	$ 0