GOODWILL AND INTANGIBLE ASSETS (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended				3 Months Ended
	Mar. 29, 2014	Mar. 29, 2014 Engineered Infrastructure Products segment	Mar. 29, 2014 Utility Support Structures segment	Dec. 28, 2013 Utility Support Structures segment	Mar. 29, 2014 Coatings segment	Mar. 29, 2014 Irrigation segment	Mar. 29, 2014 Other
Carrying amount of goodwill
Balance at the beginning of the period	$ 349,632	$ 175,442	$ 75,404	$ 75,404	$ 77,062	$ 2,420	$ 19,304
Acquisitions	4,885	4,885
Foreign currency translation	1,327	1,310			(190)	27	180
Balance at the end of the period	$ 355,844	$ 181,637	$ 75,404	$ 75,404	$ 76,872	$ 2,447	$ 19,484