Restructuring - Cash versus Non-Cash (Details) - USD ($) $ in Thousands	12 Months Ended		15 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Settled without Cash	$ 11,083	$ 31,009
Other Non-Cash Restructuring Charges	4,680	43,875
Cash Restructuring Charges (Reversals)	6,300	5,643
Total restructuring charges	10,980	49,518	$ 60,500
Fixed asset impairment
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Settled without Cash		11,871
Total restructuring charges	0	11,871
Definite-lived intangible asset impairment
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Settled without Cash		10,896
Total restructuring charges	0	10,896
Infrastructure Solutions
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Settled without Cash		21,700
Total restructuring charges	10,980	27,284
Infrastructure Solutions | Fixed asset impairment
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	0	533
Infrastructure Solutions | Definite-lived intangible asset impairment
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	0	0
Corrosion Protection
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	0	22,234
Corrosion Protection | Fixed asset impairment
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Settled without Cash		11,300
Total restructuring charges	0	11,338
Corrosion Protection | Definite-lived intangible asset impairment
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Settled without Cash		10,900
Total restructuring charges	0	10,896
Cost of revenues
Restructuring Cost and Reserve [Line Items]
Other Non-Cash Restructuring Charges	1,620	14,610
Cash Restructuring Charges (Reversals)	1,097	1,076
Total restructuring charges	2,717	15,686
Operating expenses
Restructuring Cost and Reserve [Line Items]
Other Non-Cash Restructuring Charges	25	17,579
Cash Restructuring Charges (Reversals)	4,362	2,976
Total restructuring charges	4,387	20,555
Definite-lived intangible asset impairment
Restructuring Cost and Reserve [Line Items]
Other Non-Cash Restructuring Charges	0	10,896
Cash Restructuring Charges (Reversals)	0	0
Total restructuring charges	0	10,896
Restructuring charges
Restructuring Cost and Reserve [Line Items]
Other Non-Cash Restructuring Charges	0	0
Cash Restructuring Charges (Reversals)	968	687
Total restructuring charges	968	687
Other expense
Restructuring Cost and Reserve [Line Items]
Other Non-Cash Restructuring Charges	3,035	790
Cash Restructuring Charges (Reversals)	(127)	904
Total restructuring charges	$ 2,908	$ 1,694