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ACQUISITIONS - Narrative (Details) - USD ($) $ in Thousands |  |  |  |  |  | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 18, 2018 | Aug. 03, 2018 | Aug. 01, 2018 | Jan. 26, 2018 | Jul. 31, 2017 | Mar. 30, 2018 | Jun. 30, 2016 | Apr. 30, 2016 | Dec. 29, 2018 | Dec. 30, 2017 | Dec. 31, 2016 | Jan. 31, 2019 | Sep. 29, 2018 | Mar. 31, 2018 | Jun. 25, 2016
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  | $ 385,207 | $ 337,720 | $ 321,110 |  |  |  |
Acquisitions, net of cash acquired |  |  |  |  |  |  |  |  | 143,020 | 5,362 | 0 |  |  |  |
Purchase of noncontrolling interest |  |  |  |  |  |  |  |  | (5,510) | $ 0 | $ (11,009) |  |  |  |
CSP Coatings Systems Of Auckland |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash paid to acquire business | $ 17,711 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment | 7,373 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | 5,120 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Walpar, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash paid to acquire business |  | $ 57,805 |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | $ 42,216 |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage acquired |  | 72.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Convert Italia SpA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash paid to acquire business |  | $ 43,504 |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | $ 34,280 |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage acquired |  | 75.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of contingent consideration |  | $ 11,608 |  |  |  |  |  |  |  |  |  |  |  |  |
Derit Infrastructure Pvt. Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash paid to acquire business |  |  | $ 14,700 |  |  |  |  |  |  |  |  |  |  |  |
Torrent Engineering and Equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash paid to acquire business |  |  |  | $ 4,800 |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  | 4,020 |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  | $ 3,922 |  |  |  |  |  |  |  |  |  |  |
Ownership percentage acquired |  |  |  | 60.00% |  |  |  |  |  |  |  |  |  |  |
Annual sales |  |  |  | $ 9,000 |  |  |  |  |  |  |  |  |  |  |
Aircon Guardrails Private Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,109 |  |
Goodwill |  |  |  |  | $ 3,327 |  |  |  |  |  |  |  |  |  |
Annual sales |  |  |  |  | 10,000 |  |  |  |  |  |  |  |  |  |
Acquisitions, net of cash acquired |  |  |  |  | $ 5,362 |  |  |  |  |  |  |  |  |  |
Walpar, Convert, Torrent and CSP Coatings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales of acquiree |  |  |  |  |  |  |  |  | 33,973 |  |  |  |  |  |
Net earnings of acquiree |  |  |  |  |  |  |  |  | $ 1,566 |  |  |  |  |  |
Valmont Industria e Commercio Ltda. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage acquired |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% |
Purchase of noncontrolling interest |  |  |  |  |  | $ (5,510) |  |  |  |  |  |  |  |  |
IGC Galvanizing Industries (M) Sdn Bhd |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage acquired |  |  |  |  |  |  |  | 30.00% |  |  |  |  |  |  |
Purchase of noncontrolling interest |  |  |  |  |  |  |  | $ (5,841) |  |  |  |  |  |  |
Valmont SM |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.20%
Purchase of noncontrolling interest |  |  |  |  |  |  | $ (5,168) |  |  |  |  |  |  |  |
Valmont SM | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00%
Customer Relationships | CSP Coatings Systems Of Auckland |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets | $ 3,113 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Amortization Period (Years) | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customer Relationships | Walpar, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Amortization Period (Years) |  | 14 years |  |  |  |  |  |  |  |  |  |  |  |  |
Patents & Proprietary Technology | Convert Italia SpA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Amortization Period (Years) |  | 15 years |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | Walpar, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage acquired |  |  |  |  |  |  |  |  |  |  |  | 28.00% |  |  |

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