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ACQUISITIONS AND DECONSOLIDATION (Details) |  |  |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2015 USD ($) | Oct. 06, 2014 USD ($) facility | Aug. 25, 2014 USD ($) | Mar. 03, 2014 USD ($) facility | Jun. 30, 2016 USD ($) | Apr. 30, 2016 USD ($) | Dec. 31, 2016 USD ($) | Dec. 26, 2015 USD ($) | Dec. 27, 2014 USD ($) | Sep. 24, 2016 | May 31, 2016
Acquisitions |  |  |  |  |  |  |  |  |  |  |
Acquisitions, net of cash acquired |  |  |  |  |  |  | $ 0 | $ 12,778,000 | $ 185,710,000 |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  |  |  |  |  |  |  |  |  |  | 10.00%
Fair values of the assets acquired and liabilities assumed |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | $ 321,110,000 | $ 336,916,000 | $ 385,111,000 |  |
American Galvanizing [Member] |  |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |  |
Acquisitions, net of cash acquired | $ 12,778,000 |  |  |  |  |  |  |  |  |  |
Fair values of the assets acquired and liabilities assumed |  |  |  |  |  |  |  |  |  |  |
Intangible assets | 2,178,000 |  |  |  |  |  |  |  |  |  |
Goodwill | $ 3,019,000 |  |  |  |  |  |  |  |  |  |
Valmont SM |  |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |  |
Ownership percentage acquired |  |  |  | 90.00% |  |  |  |  |  |  |
Cash acquired |  |  |  | $ 56,000 |  |  |  |  |  |  |
Annual sales |  |  |  |  |  |  |  |  |  |  |
Number of manufacturing locations operated | facility |  |  |  | 2 |  |  |  |  |  |  |
Cash paid to acquire business |  |  |  | $ 120,483,000 |  |  |  |  |  |  |
Fair value of contingent consideration |  |  |  | 0 |  |  |  |  |  |  |
Fair values of the assets acquired and liabilities assumed |  |  |  |  |  |  |  |  |  |  |
Current assets |  |  |  | 73,421,000 |  |  |  |  |  |  |
Property, plant and equipment |  |  |  | 85,638,000 |  |  |  |  |  |  |
Intangible assets |  |  |  | 30,340,000 |  |  |  |  |  |  |
Goodwill |  |  |  | 16,803,000 |  |  |  |  |  |  |
Total fair value of assets acquired |  |  |  | 206,202,000 |  |  |  |  |  |  |
Current liabilities |  |  |  | 47,754,000 |  |  |  |  |  |  |
Deferred income taxes |  |  |  | 19,715,000 |  |  |  |  |  |  |
Intercompany note payable |  |  |  | 37,448,000 |  |  |  |  |  |  |
Long-term debt |  |  |  | 8,941,000 |  |  |  |  |  |  |
Total fair value and liabilities assumed |  |  |  | 113,858,000 |  |  |  |  |  |  |
Non-controlling interests |  |  |  | 9,309,000 |  |  |  |  |  |  |
Net assets acquired |  |  |  | $ 83,035,000 |  |  |  |  |  |  |
Shakespeare |  |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |  |
Annual sales |  | $ 55,000,000 |  |  |  |  |  |  |  |  |
Number of manufacturing locations operated | facility |  | 2 |  |  |  |  |  |  |  |  |
Cash paid to acquire business |  | $ 48,272,000 |  |  |  |  |  |  |  |  |
Fair values of the assets acquired and liabilities assumed |  |  |  |  |  |  |  |  |  |  |
Current assets |  | 12,532,000 |  |  |  |  |  |  |  |  |
Property, plant and equipment |  | 10,694,000 |  |  |  |  |  |  |  |  |
Intangible assets |  | 13,500,000 |  |  |  |  |  |  |  |  |
Goodwill |  | 15,416,000 |  |  |  |  |  |  |  |  |
Total fair value of assets acquired |  | 52,142,000 |  |  |  |  |  |  |  |  |
Current liabilities |  | 3,870,000 |  |  |  |  |  |  |  |  |
Net assets acquired |  | $ 48,272,000 |  |  |  |  |  |  |  |  |
AgSense LLC |  |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |  |
Ownership percentage acquired |  |  | 51.00% |  |  |  |  |  |  |  |
Cash paid to acquire business |  |  | $ 17,000,000 |  |  |  |  |  |  |  |
Fair values of the assets acquired and liabilities assumed |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  | 17,193,000 |  |  |  |  |  |  |  |
Net sales and net earnings included in Consolidated Statements of Earnings |  |  |  |  |  |  |  |  |  |  |
Customer relationships, trade name and other intangible assets |  |  | $ 16,083,000 |  |  |  |  |  |  |  |
IGC Galvanizing Industries (M) Sdn Bhd [Member] |  |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |  |
Ownership percentage acquired |  |  |  |  |  | 30.00% |  |  |  |  |
Business Combination, Consideration Transferred |  |  |  |  |  | $ 5,841,000 |  |  |  |  |
Valmont SM |  |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |  |
Ownership percentage acquired |  |  |  |  |  |  |  |  |  | 5.20% |
Business Combination, Consideration Transferred |  |  |  |  | $ 5,168,000 |  |  |  |  |  |

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