Annual report pursuant to Section 13 and 15(d)

Revenue, Contract Assets and Liabilities and Other Contract Matters -Summary of Remaining Performance Obligation by Operating Segment (Parenthetical) (Details)

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Revenue, Contract Assets and Liabilities and Other Contract Matters -Summary of Remaining Performance Obligation by Operating Segment (Parenthetical) (Details)
Dec. 31, 2019
USD ($)
vessel
Mar. 31, 2018
vessel
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Remaining performance obligation $ 415,438,000  
Number of multi-purpose service vessels | vessel 2 2
Shipyard | Disputes    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Remaining performance obligation $ 21,900