GOODWILL AND INTANGIBLE ASSETS (Details 3) (USD $)	3 Months Ended
	Mar. 31, 2012	Sep. 24, 2011 Webforge	Mar. 31, 2012 Engineered Infrastructure Products segment:	Mar. 31, 2012 Utility Support Structures segment	Mar. 31, 2012 Coatings segment	Mar. 31, 2012 Irrigation segment	Mar. 31, 2012 Other
Carrying amount of goodwill
Balance at the beginning of the period	$ 314,662,000		$ 151,558,000	$ 77,141,000	$ 64,820,000	$ 2,576,000	$ 18,567,000
Foreign currency translation	5,955,000		5,204,000	0	51,000	23,000	677,000
Balance at the end of the period	320,617,000		156,762,000	77,141,000	64,871,000	2,599,000	19,244,000
Write-down of tradenames		64,500,000
Exces of fair value over carrying value		$ 3,100,000