Goodwill and Identified Intangible Assets - Reconciliation Goodwill (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015
Goodwill [Roll Forward]
Goodwill	$ 293,023us-gaap_Goodwill
Additions to goodwill through acquisitions	3,588us-gaap_GoodwillAcquiredDuringPeriod
Foreign currency translation	(3,414)us-gaap_GoodwillTranslationAdjustments
Goodwill	293,197us-gaap_Goodwill
Infrastructure Solutions [Member]
Goodwill [Roll Forward]
Goodwill	177,275
Additions to goodwill through acquisitions	0
Foreign currency translation	(2,664)
Goodwill	174,611
Corrosion Protection [Member]
Goodwill [Roll Forward]
Goodwill	39,500
Additions to goodwill through acquisitions	0
Foreign currency translation	(750)
Goodwill	38,750
Energy Services [Member]
Goodwill [Roll Forward]
Goodwill	76,248
Additions to goodwill through acquisitions	3,588
Foreign currency translation	0
Goodwill	$ 79,836

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

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- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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Amount of increase (decrease) from foreign currency translation adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (f)

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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