Annual report pursuant to Section 13 and 15(d)

ASSETS HELD FOR SALE - Narrative (Details)

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ASSETS HELD FOR SALE - Narrative (Details)
 3 Months Ended 4 Months Ended 9 Months Ended 12 Months Ended
Dec. 20, 2017
USD ($)
a
Jun. 30, 2017
USD ($)
drydock
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
a
Dec. 31, 2017
USD ($)
a
Dec. 31, 2017
USD ($)
a
T
Jan. 03, 2018
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Number of drydocks sold | drydock   2          
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       $ 104,576,000 $ 104,576,000 $ 104,576,000  
South Texas Fabrication Yards | 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       102,700,000 $ 102,700,000 $ 102,700,000  
Cost of property repairs and maintenance       $ 1,300,000      
Insurance deductible, percent       3.00% 3.00% 3.00%  
Loss due to Hurricane Harvey       $ 1,500,000      
Insurance recovery       1,500,000      
Proceeds from property insurance policy           $ 6,000,000  
Estimated insurance recoveries       21,500,000 $ 21,500,000 21,500,000  
South Texas Fabrication Yards | Held for sale | Buckeye              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Area of leased facility (in acres) | a 212            
Potential sales price of real estate $ 55,000,000            
South Texas Fabrication Yards | Held for sale | Buckeye | Subsequent Event              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Deposit received for real estate             $ 750,000
South Texas Fabrication Yards | Held for sale | Accrued Liabilitie              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Accrual for future repairs       3,300,000 3,300,000 3,300,000  
South Texas Fabrication Yards | Held for sale | Maximum              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Insurance coverage       25,000,000 25,000,000 25,000,000  
South Texas Fabrication Yards | Held for sale | Minimum              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Insurance deductible, value       500,000 500,000 500,000  
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       $ 1,903,000 $ 1,903,000 $ 1,903,000  
Area of leased facility (in acres) | a       35 35 35  
Impairment of asset held for sale     $ 389,000   $ 600,000 $ 989,000  
Prospect Shipyard | Disposed of by sale              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Property, plant and equipment held for sale   $ 1,900,000          
Proceeds from sale of assets   2,000,000          
Loss on sale of assets   $ (259,000)          
Fixed asset, number of tons | T           2,500