Annual report pursuant to Section 13 and 15(d)

CONTRACT REVENUE AND PERCENTAGE-OF-COMPLETION METHOD - Narrative (Details)

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CONTRACT REVENUE AND PERCENTAGE-OF-COMPLETION METHOD - Narrative (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
vessel
Dec. 31, 2017
USD ($)
vessel
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Revenue from External Customer [Line Items]        
Loss on contracts   $ 36,500 $ 1,800 $ 33,900
Loss related to cost overruns and re-work $ 22,500 $ 34,500    
Number of multi-purpose service vessels being constructed | vessel 2 2    
Estimated liquidated damages $ 233      
Percentage of revenue related to fabricated structures for delivery outside U.S   0.00% 14.00% 6.00%
Pass-through costs as a percentage of revenue   53.10% 36.50% 44.40%
Number of offshore service vessels being constructed | vessel 2 2    
Large Deepwater Project, Recently Delivered        
Revenue from External Customer [Line Items]        
Loss on contracts       $ 24,500
Fabrication Facilities        
Revenue from External Customer [Line Items]        
Loss on contract due to labor rate changes       $ 9,400
Maximum        
Revenue from External Customer [Line Items]        
Estimated liquidated damages   $ 11,200