GOODWILL AND INTANGIBLE ASSETS (Details 2) (USD $) In Thousands, unless otherwise specified	Sep. 28, 2013	Dec. 29, 2012
Webforge
Non-amortized intangible assets
Carrying value of trade names	$ 17,372	$ 17,411
Newmark
Non-amortized intangible assets
Carrying value of trade names	11,111	11,111
Ingal EPS/Ingal Civil Products
Non-amortized intangible assets
Carrying value of trade names	9,168	9,189
Donhad
Non-amortized intangible assets
Carrying value of trade names	6,917	6,932
Industrial Galvanizers
Non-amortized intangible assets
Carrying value of trade names	4,021	4,030
Other
Non-amortized intangible assets
Carrying value of trade names	14,575	11,019
Trade names
Non-amortized intangible assets
Carrying value of trade names	$ 63,164	$ 59,692