GOODWILL AND INTANGIBLE ASSETS (Details 2) (USD $) In Thousands, unless otherwise specified	Mar. 30, 2013	Dec. 29, 2012
Webforge
Non-amortized intangible assets
Carrying value of trade names	$ 16,411	$ 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	8,661	9,189
Donhad
Non-amortized intangible assets
Carrying value of trade names	6,534	6,932
Industrial Galvanizers
Non-amortized intangible assets
Carrying value of trade names	3,799	4,030
Other
Non-amortized intangible assets
Carrying value of trade names	13,153	11,019
Trade names
Non-amortized intangible assets
Carrying value of trade names	$ 59,669	$ 59,692