GOODWILL AND INTANGIBLE ASSETS - Impairment (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 26, 2015	Sep. 26, 2015
EIP \| Webforge
Indefinite-lived Intangible Assets [Line Items]
Impairment	$ 5,000
Coatings Segment \| Industrial Galvanizers
Indefinite-lived Intangible Assets [Line Items]
Impairment		$ 1,100

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.

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=26713463&loc=d3e16373-109275

Name:	us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration