Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation and Accounting Policies Property and Equipment (Details)

v3.5.0.2
Basis of Presentation and Accounting Policies Property and Equipment (Details)
$ in Millions
9 Months Ended
Sep. 30, 2016
USD ($)
Property, Plant and Equipment [Line Items]  
Capitalized Interest Costs, Including Allowance for Funds Used During Construction $ 14.3
Offshore Support Vessels [Member]  
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment, Useful Life 20 years
Wind Farm Utility Vessel [Member]  
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment, Useful Life 10 years
Inland River Dry Cargo Barges [Member]  
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment, Useful Life 20 years
Inland River Liquid Tank Barges [Member]  
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment, Useful Life 25 years
Inland River Towboats [Member]  
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment, Useful Life 25 years
U.S.-flag Product Tankers [Member]  
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment, Useful Life 25 years
Short-sea Container/RORO Vessels [Member]  
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment, Useful Life 20 years
Harbor and Offshore Tugs [Member]  
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment, Useful Life 25 years
Ocean Liquid Tank Barge [Member]  
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment, Useful Life 25 years
Terminal And Manufacturing Facilities [Member]  
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment, Useful Life 20 years