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ACQUISITIONS - Narrative (Details) - USD ($)
$ in Thousands
1 Months Ended
Jun. 30, 2016
Apr. 30, 2016
Apr. 01, 2017
Dec. 31, 2016
May 31, 2016
Acquisitions          
Goodwill     $ 324,061 $ 321,110  
Ownership percentage by noncontrolling owners         10.00%
IGC Galvanizing Industries (M) Sdn Bhd          
Acquisitions          
Percentage acquired   30.00%      
Consideration transfered   $ 5,841      
Valmont SM          
Acquisitions          
Percentage acquired     5.20%    
Consideration transfered $ 5,168