Segment Reporting - Financial Information by Segment (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Revenues	$ 324,861	$ 325,175
Gross profit	61,504	67,412
Operating income (loss)	3,181	14,133
Interest expense	(5,443)	(4,047)
Interest income	47	49
Other	(262)	(387)
Total other expense	(5,658)	(4,385)
Income (loss) before taxes on income	(2,477)	9,748
Restructuring and related charges	1,789	0
Infrastructure Solutions
Segment Reporting Information [Line Items]
Revenues	134,427	128,868
Gross profit	26,709	31,251
Operating income (loss)	(349)	5,610
Acquisition-related expenses		500
Infrastructure Solutions \| Restructuring 2017
Segment Reporting Information [Line Items]
Restructuring and related charges	3,500
Corrosion Protection
Segment Reporting Information [Line Items]
Revenues	98,105	123,390
Gross profit	23,576	27,963
Operating income (loss)	822	7,212
Corrosion Protection \| Restructuring 2017
Segment Reporting Information [Line Items]
Restructuring and related charges	1,700	2,200
Energy Services
Segment Reporting Information [Line Items]
Revenues	92,329	72,917
Gross profit	11,219	8,198
Operating income (loss)	2,708	1,311
Bayou \| Corrosion Protection
Segment Reporting Information [Line Items]
Restructuring costs	$ 400	$ 1,900

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This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments.

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- Definition

Amount of the cost of borrowed funds accounted for as interest expense.

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Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.

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The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business).

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The net result for the period of deducting operating expenses from operating revenues.

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Amount of income (expense) related to nonoperating activities, classified as other.

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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