Segment Reporting - Financial Information by Segment (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting Information [Line Items]
Revenues	$ 335,030	$ 354,473	$ 659,891	$ 679,648
Gross profit	71,053	79,768	132,557	147,180
Operating income (loss)	14,459	21,659	17,640	35,792
Interest expense	(3,923)	(4,005)	(9,366)	(8,052)
Interest income	62	35	109	84
Other	(506)	(408)	(768)	(795)
Total other expense	(4,367)	(4,378)	(10,025)	(8,763)
Income before taxes on income	10,092	17,281	7,615	27,029
Restructuring and related charges	1,540	0	3,329	0
Infrastructure Solutions
Segment Reporting Information [Line Items]
Revenues	160,732	148,311	295,159	277,179
Gross profit	35,949	34,364	62,658	65,615
Operating income (loss)	9,514	8,391	9,165	14,001
Infrastructure Solutions \| Restructuring 2017
Segment Reporting Information [Line Items]
Restructuring and related charges	2,600		6,100
Corrosion Protection
Segment Reporting Information [Line Items]
Revenues	96,389	127,715	194,494	251,105
Gross profit	24,537	35,636	48,113	63,599
Operating income (loss)	2,899	11,239	3,721	18,451
Corrosion Protection \| Restructuring 2017
Segment Reporting Information [Line Items]
Restructuring and related charges	400		2,100
Energy Services
Segment Reporting Information [Line Items]
Revenues	77,909	78,447	170,238	151,364
Gross profit	10,567	9,768	21,786	17,966
Operating income (loss)	2,046	$ 2,029	4,754	3,340
Australia \| Infrastructure Solutions
Segment Reporting Information [Line Items]
Restructuring and related charges	300		300
Environmental Techniques \| Infrastructure Solutions
Segment Reporting Information [Line Items]
Restructuring and related charges				$ 500
Hebna \| Bayou \| Corrosion Protection
Segment Reporting Information [Line Items]
Restructuring and related charges			$ 900
Restructuring costs	$ 500

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