Annual report pursuant to Section 13 and 15(d)

REVENUE, CONTRACT ASSETS AND LIABILITIES AND OTHER CONTRACT MATTERS - Remaining Performance Obligation by Segment (Details)

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REVENUE, CONTRACT ASSETS AND LIABILITIES AND OTHER CONTRACT MATTERS - Remaining Performance Obligation by Segment (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
vessel
Sep. 30, 2018
vessel
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Remaining performance obligation $ 334,573  
Number of multi-purpose service vessels | vessel 2 2
Fabrication    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Remaining performance obligation $ 63,498  
Shipyard    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Remaining performance obligation 259,644  
Shipyard | Disputed    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Remaining performance obligation $ 21,900  
Number of multi-purpose service vessels | vessel 2  
Services    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Remaining performance obligation $ 11,046  
EPC    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Remaining performance obligation $ 385