Segment Reporting - Financial Information by Segment (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Segment Reporting Information [Line Items]
Revenues	$ 309,166us-gaap_Revenues	$ 306,234us-gaap_Revenues
Gross profit	59,190us-gaap_GrossProfit	61,063us-gaap_GrossProfit
Operating income (loss)	9,125us-gaap_OperatingIncomeLoss	9,134us-gaap_OperatingIncomeLoss
Infrastructure Solutions [Member]
Segment Reporting Information [Line Items]
Revenues	122,473	122,324
Gross profit	28,615	25,554
Operating income (loss)	7,332	1,458
Corrosion Protection [Member]
Segment Reporting Information [Line Items]
Revenues	101,743	108,008
Gross profit	20,829	24,141
Operating income (loss)	500	3,691
Energy Services [Member]
Segment Reporting Information [Line Items]
Revenues	84,950	75,902
Gross profit	9,746	11,368
Operating income (loss)	$ 1,293	$ 3,985

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

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- Definition

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

+ References

No definition available.

+ Details

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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).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

+ Details

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- Details

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- Details

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