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GOODWILL AND INTANGIBLE ASSETS - Impairment (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 24, 2016 | Dec. 26, 2015 | Sep. 24, 2016
Indefinite-lived Intangible Assets [Line Items] |  |  |
Goodwill | $ 327,863,000 | $ 336,916,000 | $ 327,863,000
ESS |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |
Goodwill | 96,716,000 | 101,275,000 | 96,716,000
ESS | Webforge |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |
Impairment | 5,000,000 | 830,000 |
Energy & Mining |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |
Goodwill | 76,191,000 | 81,159,000 | 76,191,000
Coatings Segment |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |
Goodwill | 59,882,000 | $ 59,719,000 | 59,882,000
Coatings Segment | Industrial Galvanizers |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |
Impairment |  |  | 1,100,000
Offshore Structures | Energy & Mining |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |
Goodwill | $ 13,872 |  | $ 13,872

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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 impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275 + Details
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