Segment Reporting - Financial Information by Segment (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2016	Mar. 31, 2015
Segment Reporting Information [Line Items]
Revenues	$ 293,908	$ 309,166
Gross profit	54,414	59,190
Operating income	(4,139)	9,125
Restructuring charges	6,797	658
Acquisition-related expenses	1,031	323
Restructuring Plan 2014
Segment Reporting Information [Line Items]
Restructuring charges	(200)	800
Restructuring Plan 2016
Segment Reporting Information [Line Items]
Restructuring charges	9,742
Underground Solutions
Segment Reporting Information [Line Items]
Acquisition-related expenses	1,000
Inventory step up expense	1,200
Schultz Mechanical Contractors, Inc.
Segment Reporting Information [Line Items]
Acquisition-related expenses		300
Infrastructure Solutions
Segment Reporting Information [Line Items]
Revenues	125,762	122,473
Gross profit	29,744	28,615
Operating income	5,808	7,332
Infrastructure Solutions \| Restructuring Plan 2014
Segment Reporting Information [Line Items]
Restructuring charges	(200)	800
Infrastructure Solutions \| Restructuring Plan 2016
Segment Reporting Information [Line Items]
Restructuring charges	2,153
Corrosion Protection
Segment Reporting Information [Line Items]
Revenues	92,446	101,743
Gross profit	17,199	20,829
Operating income	(5,670)	500
Corrosion Protection \| Restructuring Plan 2016
Segment Reporting Information [Line Items]
Restructuring charges	2,737
Energy Services
Segment Reporting Information [Line Items]
Revenues	75,700	84,950
Gross profit	7,471	9,746
Operating income	(4,277)	$ 1,293
Energy Services \| Restructuring Plan 2016
Segment Reporting Information [Line Items]
Restructuring charges	$ 4,852

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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 23
-URI http://asc.fasb.org/extlink&oid=73531572&loc=d3e1043-128460

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 4A
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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
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The net result for the period of deducting operating expenses from operating revenues.

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No definition available.

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition

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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