GOODWILL AND INTANGIBLE ASSETS (Details 3) (USD $) In Thousands, unless otherwise specified	6 Months Ended				6 Months Ended
	Jun. 28, 2014	Jun. 28, 2014 Engineered Infrastructure Products segment	Jun. 28, 2014 Utility Support Structures segment	Dec. 28, 2013 Utility Support Structures segment	Jun. 28, 2014 Coatings segment	Jun. 28, 2014 Irrigation segment	Jun. 28, 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	11,846	11,846
Foreign currency translation	6,927	5,548			679	46	654
Balance at the end of the period	$ 368,405	$ 192,836	$ 75,404	$ 75,404	$ 77,741	$ 2,466	$ 19,958