Segment Reporting - Financial Information by Segment (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Segment Reporting Information [Line Items]
Revenues	$ 276,904	$ 324,861
Gross profit	48,295	61,504
Operating income (loss)	(774)	3,181
Interest expense	(3,590)	(5,443)
Interest income	285	47
Other	(674)	(262)
Total other expense	(3,979)	(5,658)
Loss before tax benefit	(4,753)	(2,477)
Restructuring and related charges	1,086	1,789
Restructuring 2017
Segment Reporting Information [Line Items]
Other	(200)
Restructuring and related charges	400
Infrastructure Solutions
Segment Reporting Information [Line Items]
Revenues	131,543	134,427
Infrastructure Solutions \| Restructuring 2017
Segment Reporting Information [Line Items]
Restructuring and related charges	2,100	3,200
Corrosion Protection
Segment Reporting Information [Line Items]
Revenues	64,498	98,105
Corrosion Protection \| Restructuring 2017
Segment Reporting Information [Line Items]
Restructuring and related charges	200	1,500
Energy Services
Segment Reporting Information [Line Items]
Revenues	80,863	92,329
Australia \| Infrastructure Solutions
Segment Reporting Information [Line Items]
Restructuring and related charges	100
Environmental Techniques \| Infrastructure Solutions
Segment Reporting Information [Line Items]
Restructuring and related charges		100
Operating Segments \| Infrastructure Solutions
Segment Reporting Information [Line Items]
Revenues	131,543	134,427
Gross profit	26,586	26,709
Operating income (loss)	5,715	3,237
Operating Segments \| Corrosion Protection
Segment Reporting Information [Line Items]
Revenues	64,498	98,105
Gross profit	12,873	23,576
Operating income (loss)	(1,760)	4,962
Operating Segments \| Energy Services
Segment Reporting Information [Line Items]
Revenues	80,863	92,329
Gross profit	8,836	11,219
Operating income (loss)	1,115	3,127
Corporate
Segment Reporting Information [Line Items]
Operating income (loss)	$ (5,844)	$ (8,145)

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