GOODWILL AND INTANGIBLE ASSETS (Details 3) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 29, 2013
Carrying amount of goodwill
Balance at the beginning of the period	$ 330,791
Acquisition	13,326
Foreign currency translation	(11,750)
Balance at the end of the period	332,367
Engineered Infrastructure Products segment
Carrying amount of goodwill
Balance at the beginning of the period	155,185
Acquisition	13,326
Foreign currency translation	(9,663)
Other	1,737
Balance at the end of the period	160,585
Utility Support Structures segment
Carrying amount of goodwill
Balance at the beginning of the period	77,141
Other	(1,737)
Balance at the end of the period	75,404
Coatings segment
Carrying amount of goodwill
Balance at the beginning of the period	77,053
Foreign currency translation	(998)
Balance at the end of the period	76,055
Irrigation segment
Carrying amount of goodwill
Balance at the beginning of the period	2,517
Foreign currency translation	(54)
Balance at the end of the period	2,463
Other
Carrying amount of goodwill
Balance at the beginning of the period	18,895
Foreign currency translation	(1,035)
Balance at the end of the period	$ 17,860