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GOODWILL AND INTANGIBLE ASSETS - Impairment (Details) - USD ($) | Apr. 01, 2017 | Dec. 31, 2016
--- | --- | ---
Indefinite-lived Intangible Assets [Line Items] |  |
Goodwill | $ 324,061,000 | $ 321,110,000
ESS |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Goodwill | 95,079,000 | 94,314,000
Energy & Mining |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Goodwill | 74,158,000 | 72,212,000
Coatings Segment |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Goodwill | 59,696,000 | $ 59,569,000
Offshore Structures | Energy & Mining |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Goodwill | $ 13,209 |

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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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