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ACQUISITIONS - Narrative (Details) - USD ($) $ in Thousands |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 11, 2019 | Dec. 31, 2018 | Oct. 18, 2018 | Aug. 03, 2018 | Aug. 01, 2018 | Jan. 26, 2018 | Jan. 31, 2019 | Apr. 30, 2016 | Mar. 30, 2019 | Mar. 31, 2018 | Dec. 29, 2018
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  | $ 416,996 |  | $ 385,207
United Galvanizing [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash paid in acquisition | $ 26,000 |  |  |  |  |  |  |  |  |  |
Property, plant, and equipment acquired | 7,216 |  |  |  |  |  |  |  |  |  |
Consideration transfered | 28,000 |  |  |  |  |  |  |  |  |  |
Contingent consideration liability, current | 2,000 |  |  |  |  |  |  |  |  |  |
Goodwill | $ 15,720 |  |  |  |  |  |  |  |  |  |
CSP Coatings Systems Of Auckland [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash paid in acquisition |  |  | $ 17,711 |  |  |  |  |  |  |  |
Property, plant, and equipment acquired |  |  | 7,373 |  |  |  |  |  |  |  |
Goodwill |  |  | $ 5,120 |  |  |  |  |  |  |  |
Larson Camouflage [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash paid in acquisition |  | $ 31,106 |  |  |  |  |  |  |  |  |
Property, plant, and equipment acquired |  | 1,151 |  |  |  |  |  |  |  |  |
Consideration transfered |  | $ 34,562 |  |  |  |  |  |  |  |  |
Contingent consideration liability, as percent of purchase price (percent) |  | 10.00% |  |  |  |  |  |  |  |  |
Goodwill |  | $ 14,494 |  |  |  |  |  |  |  |  |
Walpar |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage acquired |  |  |  | 72.00% |  |  | 28.00% |  |  |  |
Consideration transfered |  |  |  | $ 57,805 |  |  | $ 23,082 |  |  |  |
Goodwill |  |  |  | 42,216 |  |  |  |  |  |  |
Convert Italia S.p.A |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Goodwill, Expected Tax Deductible Amount |  |  |  | $ 0 |  |  |  |  |  |  |
Percentage acquired |  |  |  | 75.00% |  |  |  |  |  |  |
Consideration transfered |  |  |  | $ 43,504 |  |  |  |  |  |  |
Goodwill |  |  |  | $ 34,280 |  |  |  |  |  |  |
Derit Infrastructure Pvt. Ltd. [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Consideration transfered |  |  |  |  | $ 14,700 |  |  |  |  |  |
Torrent Engineering and Equipment |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage acquired |  |  |  |  |  | 60.00% |  |  |  |  |
Consideration transfered |  |  |  |  |  | $ 4,800 |  |  |  |  |
Goodwill |  |  |  |  |  | 3,922 |  |  |  |  |
Annual revenue of acquiree |  |  |  |  |  | 9,000 |  |  |  |  |
Customer relationships and other intangible assets |  |  |  |  |  | $ 4,020 |  |  |  |  |
Walpart, Convert, and Torrent [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue of acquiree since acquisition |  |  |  |  |  |  |  |  | 41,557 | $ 932 |
Net earnings of acquiree since acquisition |  |  |  |  |  |  |  |  | $ 647 | $ 86 |
IGC Galvanizing Industries (M) Sdn Bhd [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage acquired |  |  |  |  |  |  |  | 10.00% |  |  |
Consideration transfered |  |  |  |  |  |  |  | $ 5,510 |  |  |
Customer Relationships | United Galvanizing [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Useful life | 10 years |  |  |  |  |  |  |  |  |  |
Customer relationships and other intangible assets | $ 3,092 |  |  |  |  |  |  |  |  |  |
Customer Relationships | CSP Coatings Systems Of Auckland [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Useful life |  |  | 10 years |  |  |  |  |  |  |  |
Customer relationships and other intangible assets |  |  | $ 3,113 |  |  |  |  |  |  |  |
Customer Relationships | Larson Camouflage [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Useful life |  | 12 years |  |  |  |  |  |  |  |  |
Customer relationships and other intangible assets |  | $ 17,050 |  |  |  |  |  |  |  |  |
Customer Relationships | Walpar |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Useful life |  |  |  | 14 years |  |  |  |  |  |  |
Patents & Proprietary Technology | Convert Italia S.p.A |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Useful life |  |  |  | 15 years |  |  |  |  |  |  |
Trade Names | United Galvanizing [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Customer relationships and other intangible assets | $ 894 |  |  |  |  |  |  |  |  |  |

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