Goodwill and Intangible Assets - Reconciliation Goodwill (Details) $ in Thousands	12 Months Ended
Dec. 31, 2016 USD ($)
Goodwill [Roll Forward]
Goodwill, gross - beginning balance	$ 344,116
Goodwill, accumulated impairment loss - beginning balance	(94,996)
Goodwill, net - beginning balance	249,120
Additions to goodwill through acquisitions	50,585
Foreign currency translation	(1,086)
Goodwill, gross - ending balance	393,615
Goodwill, accumulated impairment loss - ending balance	(94,996)
Goodwill, net - ending balance	298,619
Underground Solutions
Goodwill [Roll Forward]
Additions to goodwill through acquisitions	44,000
Fyfe Europe
Goodwill [Roll Forward]
Additions to goodwill through acquisitions	2,400
LMJ
Goodwill [Roll Forward]
Additions to goodwill through acquisitions	800
Concrete Solutions
Goodwill [Roll Forward]
Additions to goodwill through acquisitions	3,400
Infrastructure Solutions
Goodwill [Roll Forward]
Goodwill, gross - beginning balance	190,525
Goodwill, accumulated impairment loss - beginning balance	(16,069)
Goodwill, net - beginning balance	174,456
Additions to goodwill through acquisitions	50,585
Foreign currency translation	(1,616)
Goodwill, gross - ending balance	239,494
Goodwill, accumulated impairment loss - ending balance	(16,069)
Goodwill, net - ending balance	223,425
Corrosion Protection
Goodwill [Roll Forward]
Goodwill, gross - beginning balance	73,345
Goodwill, accumulated impairment loss - beginning balance	(45,400)
Goodwill, net - beginning balance	27,945
Additions to goodwill through acquisitions	0
Foreign currency translation	530
Goodwill, gross - ending balance	73,875
Goodwill, accumulated impairment loss - ending balance	(45,400)
Goodwill, net - ending balance	28,475
Energy Services
Goodwill [Roll Forward]
Goodwill, gross - beginning balance	80,246
Goodwill, accumulated impairment loss - beginning balance	(33,527)
Goodwill, net - beginning balance	46,719
Additions to goodwill through acquisitions	0
Foreign currency translation	0
Goodwill, gross - ending balance	80,246
Goodwill, accumulated impairment loss - ending balance	(33,527)
Goodwill, net - ending balance	$ 46,719

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
-Subparagraph (a)
-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

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=64834752&loc=SL49117168-202975

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