Segment Reporting - Financial Information by Segment (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Segment Reporting Information [Line Items]
Revenues	$ 341,872,000	$ 308,524,000	$ 1,021,520,000	$ 900,118,000
Gross profit	73,442,000	66,318,000	220,622,000	181,922,000
Operating income (loss)	(75,009,000)	20,505,000	(39,217,000)	24,511,000
Interest expense	(3,962,000)	(3,825,000)	(12,014,000)	(11,081,000)
Interest income	33,000	37,000	117,000	197,000
Other	(798,000)	288,000	(1,593,000)	(1,183,000)
Total other expense	(4,727,000)	(3,500,000)	(13,490,000)	(12,067,000)
Income (loss) before taxes on income	(79,736,000)	17,005,000	(52,707,000)	12,444,000
Restructuring and related charges	5,439,000	212,000	5,439,000	8,544,000
Goodwill impairment	45,390,000	0	45,390,000	0
Definite-lived intangible asset impairment	41,032,000	0	41,032,000	0
Restructuring 2017
Segment Reporting Information [Line Items]
Restructuring and related charges	6,700,000		6,700,000
Restructuring 2016
Segment Reporting Information [Line Items]
Restructuring and related charges		1,287,000	0	14,791,000	$ 16,100,000
Infrastructure Solutions
Segment Reporting Information [Line Items]
Revenues	174,161,000	158,562,000	451,340,000	434,523,000
Gross profit	41,189,000	40,566,000	106,803,000	109,485,000
Operating income (loss)	(73,786,000)	18,573,000	(59,786,000)	37,448,000
Goodwill impairment	45,400,000		45,390,000
Definite-lived intangible asset impairment	41,000,000		41,000,000
Acquisition-related expenses	100,000	300,000	700,000	2,100,000
Inventory step up expense				3,600,000
Infrastructure Solutions | Restructuring 2017
Segment Reporting Information [Line Items]
Restructuring and related charges	4,600,000		4,600,000
Infrastructure Solutions | Restructuring 2016
Segment Reporting Information [Line Items]
Restructuring and related charges		(31,000)		3,340,000
Corrosion Protection
Segment Reporting Information [Line Items]
Revenues	102,276,000	95,084,000	353,381,000	281,939,000
Gross profit	23,063,000	18,374,000	86,663,000	52,676,000
Operating income (loss)	(2,659,000)	513,000	15,793,000	(7,626,000)
Goodwill impairment			0
Corrosion Protection | Restructuring 2017
Segment Reporting Information [Line Items]
Restructuring and related charges	2,200,000		2,200,000
Corrosion Protection | Restructuring 2016
Segment Reporting Information [Line Items]
Restructuring and related charges		178,000		3,872,000
Energy Services
Segment Reporting Information [Line Items]
Revenues	65,435,000	54,878,000	216,799,000	183,656,000
Gross profit	9,190,000	7,378,000	27,156,000	19,761,000
Operating income (loss)	1,436,000	1,419,000	4,776,000	(5,311,000)
Goodwill impairment			0
Energy Services | Restructuring 2016
Segment Reporting Information [Line Items]
Restructuring and related charges		$ 1,140,000		7,579,000
Bayou | Corrosion Protection
Segment Reporting Information [Line Items]
Restructuring costs	$ 1,900,000		$ 1,900,000
Operating Income (Loss) | Infrastructure Solutions | Restructuring 2016
Segment Reporting Information [Line Items]
Restructuring and related charges				3,100,000
Nonoperating Income (Expense) | Restructuring 2016
Segment Reporting Information [Line Items]
Restructuring and related charges				$ 300,000