GOODWILL AND INTANGIBLE ASSETS (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 31, 2011	Mar. 31, 2012
Webforge
Non-amortized intangible assets
Carrying value of trade names	$ 16,659	$ 17,266
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	8,792	9,113
Donhad
Non-amortized intangible assets
Carrying value of trade names	6,633	6,875
PiRod
Non-amortized intangible assets
Carrying value of trade names	1,750	1,750
Industrial Galvanizers
Non-amortized intangible assets
Carrying value of trade names	3,856	3,997
Other
Non-amortized intangible assets
Carrying value of trade names	7,224	7,336
Trade names
Non-amortized intangible assets
Carrying value of trade names	56,025	57,448
Write down of PiRod and Industrial Galvanizers of America trade names	$ 3,779