Segment Reporting - Financial Information by Segment (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Segment Reporting Information [Line Items]
Revenues	$ 297,686	$ 337,096	$ 591,594	$ 646,262
Gross profit	61,190	72,053	115,604	131,243
Operating income (loss)	8,145	14,523	4,006	23,648
Restructuring charges	1,535	204	8,332	862
Acquisition-related expenses	(704)	0	(1,735)	(323)
Interest expense	3,641	2,989	7,256	6,221
Interest income	128	78	160	204
Other	(498)	778	(1,471)	(2,001)
Total other expense	(4,011)	(2,133)	(8,567)	(8,018)
Income (loss) before taxes on income	4,134	12,390	(4,561)	15,630
Restructuring Plan 2014
Segment Reporting Information [Line Items]
Restructuring charges	100	5,700		9,200
Restructuring Plan 2016
Segment Reporting Information [Line Items]
Restructuring charges	3,763		13,505
Schultz Mechanical Contractors, Inc.
Segment Reporting Information [Line Items]
Restructuring charges			200
Infrastructure Solutions
Segment Reporting Information [Line Items]
Revenues	150,199	149,091	275,961	271,564
Gross profit	39,175	39,031	68,919	67,646
Operating income (loss)	13,067	12,115	18,875	19,447
Acquisition-related expenses	(700)		(1,700)
Inventory step up expense			3,600
Infrastructure Solutions \| Restructuring Plan 2014
Segment Reporting Information [Line Items]
Restructuring charges	100	5,700	100	6,500
Infrastructure Solutions \| Restructuring Plan 2016
Segment Reporting Information [Line Items]
Operating income (loss)	(1,000)		(3,100)
Restructuring charges	1,219		3,372
Infrastructure Solutions \| Underground Solutions
Segment Reporting Information [Line Items]
Inventory step up expense	2,400
Corrosion Protection
Segment Reporting Information [Line Items]
Revenues	94,410	106,022	186,856	207,765
Gross profit	17,103	21,887	34,302	42,716
Operating income (loss)	(2,469)	936	(8,139)	1,436
Corrosion Protection \| Restructuring Plan 2016
Segment Reporting Information [Line Items]
Restructuring charges	957		3,694
Energy Services
Segment Reporting Information [Line Items]
Revenues	53,077	81,983	128,777	166,933
Gross profit	4,912	11,135	12,383	20,881
Operating income (loss)	(2,453)	$ 1,472	(6,730)	2,765
Energy Services \| Restructuring Plan 2016
Segment Reporting Information [Line Items]
Restructuring charges	$ 1,587		$ 6,439	$ 6,400

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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This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to inventory acquired in connection with a business combination for which the initial accounting was incomplete.

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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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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 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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