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Goodwill and Intangible Assets - Schedule of Goodwill (Details) - USD ($) $ in Thousands | 12 Months Ended
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Feb. 28, 2017 | Feb. 29, 2016
Goodwill [Roll Forward] |  |
Goodwill, beginning balance | $ 292,527 | $ 279,074
Acquisitions | 13,386 | 15,576
Foreign Exchange Translation | 666 | (2,123)
Goodwill, ending balance | 306,579 | 292,527
Galvanizing Services [Member] |  |
Goodwill [Roll Forward] |  |
Goodwill, beginning balance | 109,314 | 95,538
Acquisitions | 0 | 15,576
Foreign Exchange Translation | 666 | (1,800)
Goodwill, ending balance | 109,980 | 109,314
Energy [Member] |  |
Goodwill [Roll Forward] |  |
Goodwill, beginning balance | 183,213 | 183,536
Acquisitions | 13,386 | 0
Foreign Exchange Translation | 0 | (323)
Goodwill, ending balance | $ 196,599 | $ 183,213

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- Definition 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. + 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 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 + Details
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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 (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits 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 + Details
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