Segment Reporting - Financial Information by Segment (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Segment Reporting Information [Line Items]
Revenues	$ 337,096	$ 322,868	$ 646,262	$ 629,102
Gross profit	72,053	71,918	131,243	132,981
Operating income	14,523	20,619	23,648	29,753
Infrastructure Solutions [Member] \| Restructuring Plan 2014 [Member]
Segment Reporting Information [Line Items]
Charges related to restructuring	5,694		9,232
Infrastructure Solutions [Member] \| Restructuring Plan 2014 [Member] \| Gross Profit [Member]
Segment Reporting Information [Line Items]
Charges related to restructuring	1,000		1,100
Infrastructure Solutions [Member] \| Restructuring Plan 2014 [Member] \| Operating Income [Member]
Segment Reporting Information [Line Items]
Charges related to restructuring	5,700		6,500
Operating Segments [Member] \| Infrastructure Solutions [Member]
Segment Reporting Information [Line Items]
Revenues	149,091	147,260	271,564	269,584
Gross profit	39,031	35,951	67,646	61,505
Operating income	12,115	12,876	19,447	14,334
Operating Segments [Member] \| Corrosion Protection [Member]
Segment Reporting Information [Line Items]
Revenues	106,022	102,923	207,765	210,931
Gross profit	21,887	25,034	42,716	49,175
Operating income	936	5,277	1,436	8,968
Operating Segments [Member] \| Energy Services [Member]
Segment Reporting Information [Line Items]
Revenues	81,983	72,685	166,933	148,587
Gross profit	11,135	10,933	20,881	22,301
Operating income	$ 1,472	$ 2,466	$ 2,765	$ 6,451

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

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+ References

No definition available.

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- Definition

Discloses the amount charged against the accrued restructuring reserves, or earnings if not previously accrued, during the period for the specified type of restructuring cost.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 420

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SAB TOPIC 5.P.4(b))

-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 420

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 5

-Section P

-Subsection 3, 4

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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).

+ 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

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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.

+ References

No definition available.

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