Quarterly report pursuant to Section 13 or 15(d)

Operating Leases (Details)

v3.19.1
Operating Leases (Details)
3 Months Ended
Mar. 31, 2019
equipment
rail_ferry
Petroleum and Chemical Carriers - U.S.-flag  
Operating Leases [Line Items]  
Equipment Subject to Operating Lease, Number of Units 2
Petroleum and Chemical Carriers - U.S.-flag | Minimum  
Operating Leases [Line Items]  
Sale Leaseback Transaction, Lease Terms P42M
Petroleum and Chemical Carriers - U.S.-flag | Maximum  
Operating Leases [Line Items]  
Sale Leaseback Transaction, Lease Terms P89M
Harbor Tugs - U.S.-flag  
Operating Leases [Line Items]  
Equipment Subject to Operating Lease, Number of Units 5
Pure Car/Truck Carriers  
Operating Leases [Line Items]  
Equipment Subject to Operating Lease, Number of Units 4
Inland River Dry-Cargo Barges  
Operating Leases [Line Items]  
Equipment Subject to Operating Lease, Number of Units 50
Inland River Towboats  
Operating Leases [Line Items]  
Equipment Subject to Operating Lease, Number of Units 4
Inland River Harbor Boats  
Operating Leases [Line Items]  
Equipment Subject to Operating Lease, Number of Units 6
Other Equipment | Minimum  
Operating Leases [Line Items]  
Lessee, Operating Lease, Term of Contract 12 months
Other Equipment | Maximum  
Operating Leases [Line Items]  
Lessee, Operating Lease, Term of Contract 204 months
Bareboat Chartered, Petroleum and Chemical Carriers - U.S.-flag  
Operating Leases [Line Items]  
Equipment Subject to Operating Lease, Number of Units 3
Bareboat Chartered, Harbor Tugs - U.S.-flag  
Operating Leases [Line Items]  
Equipment Subject to Operating Lease, Number of Units | rail_ferry 2
Time Chartered, Petroleum and Chemical Carriers - U.S.-flag  
Operating Leases [Line Items]  
Equipment Subject to Operating Lease, Number of Units 4
Time Chartered, PCTCs - U.S.-flag  
Operating Leases [Line Items]  
Equipment Subject to Operating Lease, Number of Units 4
Time Chartered, Inland River Towboats  
Operating Leases [Line Items]  
Equipment Subject to Operating Lease, Number of Units 7
Time Chartered, Offshore Tug - U.S.-flag  
Operating Leases [Line Items]  
Equipment Subject to Operating Lease, Number of Units 1