Quarterly report pursuant to Section 13 or 15(d)

Leases - Additional Information (Details)

v3.19.1
Leases - Additional Information (Details)
3 Months Ended
Mar. 31, 2019
Vessel
Anchor Handling Towing Supply Vessels  
Lessee Lease Description [Line Items]  
Number of operating leases on equipment 4
Liftboats  
Lessee Lease Description [Line Items]  
Number of operating leases on equipment 2
Fast Support Vessels  
Lessee Lease Description [Line Items]  
Number of operating leases on equipment 1
Supply Vessels, Certain Facilities And Other Equipments  
Lessee Lease Description [Line Items]  
Number of operating leases on equipment 1
Vessels | Minimum  
Lessee Lease Description [Line Items]  
Operating lease, lease terms (in duration) 8 months
Vessels | Maximum  
Lessee Lease Description [Line Items]  
Operating lease, lease terms (in duration) 32 months
Other Equipment | Minimum  
Lessee Lease Description [Line Items]  
Operating lease, lease terms (in duration) 10 months
Other Equipment | Maximum  
Lessee Lease Description [Line Items]  
Operating lease, lease terms (in duration) 333 months