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ACQUISITIONS - Narrative (Details) - USD ($) $ in Thousands |  | 1 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jul. 31, 2017 | Jun. 30, 2016 | Apr. 30, 2016 | Sep. 30, 2017 | Dec. 31, 2016 | May 31, 2016
Acquisitions |  |  |  |  |  |
Goodwill |  |  |  | $ 336,754 | $ 321,110 |
Ownership percentage by noncontrolling owners |  |  |  |  |  | 10.00%
IGC Galvanizing Industries (M) Sdn Bhd |  |  |  |  |  |
Acquisitions |  |  |  |  |  |
Consideration transfered |  |  | $ 5,841 |  |  |
Percentage acquired |  |  | 30.00% |  |  |
Valmont SM |  |  |  |  |  |
Acquisitions |  |  |  |  |  |
Consideration transfered |  | $ 5,168 |  |  |  |
Percentage acquired |  |  |  | 5.20% |  |
Aircon |  |  |  |  |  |
Acquisitions |  |  |  |  |  |
Consideration transfered | $ 5,362 |  |  |  |  |
Annual revenue of acquiree | 10,000 |  |  |  |  |
Goodwill | $ 3,327 |  |  |  |  |
Customer relationships and other intangible assets |  |  |  | $ 2,109 |  |

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