GOODWILL AND INTANGIBLE ASSETS (Details 3) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 28, 2013
Carrying amount of goodwill
Balance at the beginning of the period	$ 330,791
Acquisition	13,322
Foreign currency translation	(3,618)
Balance at the end of the period	340,495
Engineered Infrastructure Products segment
Carrying amount of goodwill
Balance at the beginning of the period	155,185
Acquisition	13,322
Foreign currency translation	(3,630)
Other	1,737
Balance at the end of the period	166,614
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	120
Balance at the end of the period	77,173
Irrigation segment
Carrying amount of goodwill
Balance at the beginning of the period	2,517
Foreign currency translation	(67)
Balance at the end of the period	2,450
Other
Carrying amount of goodwill
Balance at the beginning of the period	18,895
Foreign currency translation	(41)
Balance at the end of the period	$ 18,854