Annual report pursuant to Section 13 and 15(d)

REVENUE, CONTRACT ASSETS AND LIABILITIES AND OTHER CONTRACT MATTERS - Narrative (Details)

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REVENUE, CONTRACT ASSETS AND LIABILITIES AND OTHER CONTRACT MATTERS - Narrative (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
Project
Dec. 31, 2018
USD ($)
vessel
Project
Dec. 31, 2017
USD ($)
Project
Dec. 31, 2016
USD ($)
Long-term Contracts or Programs Disclosure [Line Items]        
Bad debt expense   $ 30 $ 21 $ 493
Allowance for bad debt $ 400 400 1,900  
Increase in operating loss due to change in estimates   9,100   $ 1,800
Revenue, variable consideration, contract price reduction 11,200 11,200 11,700  
Contract assets, noncurrent $ 12,452 $ 12,452 0  
Number of uncompleted projects | Project 9 9    
Number of harbor tug vessels | vessel   10    
Fabrication        
Long-term Contracts or Programs Disclosure [Line Items]        
Increase in operating loss due to change in estimates   $ 2,400    
Shipyard        
Long-term Contracts or Programs Disclosure [Line Items]        
Increase in operating loss due to change in estimates $ 5,800 $ 6,700 $ 34,500  
Number of projects in a loss position | Project     2  
Sales Revenue, Net | Geographic Concentration Risk | Non-US        
Long-term Contracts or Programs Disclosure [Line Items]        
Concentration risk, percentage   0.00% 0.00% 14.00%