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ACQUISITIONS - Narrative (Details) - USD ($) $ in Thousands |  | 1 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2015 | Jun. 30, 2016 | Apr. 30, 2016 | Sep. 24, 2016 | May 31, 2016 | Dec. 26, 2015
Acquisitions |  |  |  |  |  |
Goodwill |  |  |  | $ 327,863 |  | $ 336,916
Ownership percentage by noncontrolling owners |  |  |  |  | 10.00% |
American Galvanizing |  |  |  |  |  |
Acquisitions |  |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired | $ 12,778 |  |  |  |  |
Annual sales | 10,000 |  |  |  |  |
Goodwill | 3,019 |  |  |  |  |
Intangible assets | $ 2,178 |  |  |  |  |
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 |  |  |  |

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