Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation and Accounting Policies - Schedule of Property and Equipment Useful Life (Details)

v3.19.1
Basis of Presentation and Accounting Policies - Schedule of Property and Equipment Useful Life (Details)
3 Months Ended
Mar. 31, 2019
Crew Transfer Vessels  
Property Plant And Equipment [Line Items]  
Estimated useful life (Year) 10 years
All Other Offshore Support Vessels  
Property Plant And Equipment [Line Items]  
Estimated useful life (Year) 20 years