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ASSETS HELD FOR SALE - Narrative (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Dec. 31, 2018 USD ($) machine crane | Dec. 31, 2017 USD ($) building drydock | Dec. 31, 2016 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Gain (loss) on sale of assets |  |  |  | $ 7,642,000 | $ (259,000) | $ 0
Property, plant and equipment, net | $ 79,930,000 |  |  | 79,930,000 | 88,899,000 |
Insured event, gain (loss) |  |  |  | 3,571,000 | 0 | $ 0
Disposed of by sale |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Gain (loss) on sale of assets |  |  |  | 7,700,000 |  |
Held for sale |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Property, plant and equipment held for sale | 18,935,000 |  |  | 18,935,000 |  |
Impairment of asset held for sale |  |  |  | 2,400,000 | 1,000,000 |
Texas South Yard And Texas North Yard | Disposed of by sale |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Proceeds from sale of productive assets |  |  |  | 1,300,000 |  |
Gain (loss) on sale of assets |  |  |  | (300,000) |  |
South Texas Fabrication Yards, South Yard | Disposed of by sale |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Proceeds from sale of productive assets |  |  |  | 53,800,000 |  |
Gain (loss) on disposition |  |  |  | 3,900,000 |  |
Proceeds from sale of assets |  |  | $ 55,000,000 |  |  |
Selling costs |  |  | 1,200,000 |  |  |
South Texas Fabrication Yards, North Yard |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Property, plant and equipment, net | 800,000 |  |  | 800,000 |  |
South Texas Fabrication Yards, North Yard | Disposed of by sale |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Proceeds from sale of productive assets |  |  |  | 27,400,000 |  |
Gain (loss) on disposition |  |  |  | 4,100,000 |  |
Proceeds from sale of assets | 28,000,000 |  |  | 28,000,000 |  |
Selling costs | 600,000 |  |  |  |  |
Disposal group, not included in sale | 18,800,000 |  |  | 18,800,000 |  |
South Texas Fabrication Yards, North Yard | Held for sale |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Insurance recoveries |  |  | 9,000,000 |  |  |
Insured event, gain (loss) |  |  | 0 |  |  |
Fabrication Division | Held for sale |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Property, plant and equipment held for sale | 18,011,000 |  |  | $ 18,011,000 |  |
Number of cranes | crane |  |  |  | 3 |  |
Number of bending roll machines | machine |  |  |  | 2 |  |
South Texas Fabrication Yards | Held for sale |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Proceeds from property insurance policy |  |  |  | $ 9,400,000 | 6,000,000 |
Insurance settlement |  |  | $ 15,400,000 |  |  |
South Texas Fabrication Yards, North Yard, Assets Under Agreement To Sell | Held for sale |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Insurance recoveries |  | $ 5,200,000 |  |  | 1,300,000 |
Insured event, gain (loss) |  |  |  | 3,600,000 | 0 |
Impairment of asset held for sale |  |  |  | 1,400,000 |  |
South Texas Properties, Total Loss Of Buildings | Held for sale |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Insurance recoveries |  |  |  |  | 1,500,000 |
South Texas Properties, Estimated Future Repairs | Held for sale |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Insurance recoveries |  |  |  |  | 3,200,000 |
Prospect Shipyard | Disposed of by sale |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Gain (loss) on sale of assets |  |  |  |  | (300,000) |
Proceeds from sale of assets |  |  |  |  | $ 2,000,000 |
Prospect Shipyard | Held for sale |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Property, plant and equipment held for sale | $ 924,000 |  |  | 924,000 |  |
Impairment of asset held for sale |  |  |  | $ 1,000,000 |  |
Number of drydocks sold | drydock |  |  |  |  | 2 |
Building | South Texas Properties, Total Loss Of Buildings | Held for sale |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Number of buildings | building |  |  |  |  | 2 |

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