Quarterly report pursuant to Section 13 or 15(d)

Commitments And Contingencies (Details)

v3.20.1
Commitments And Contingencies (Details)
$ in Thousands
Apr. 28, 2020
USD ($)
claim
Oct. 16, 2019
claim
Aug. 02, 2016
claim
Feb. 16, 2016
claim
Mar. 31, 2020
USD ($)
equipment
vessel
Loss Contingencies [Line Items]          
Unrecorded unconditional purchase obligation, due in remainder of 2020         $ 27,408
Unrecorded unconditional purchase obligation, due within 2021         30,993
Unrecorded unconditional purchase obligation, due within 2022         2,636
Unrecorded unconditional purchase obligation         61,037
Subsequent Event          
Loss Contingencies [Line Items]          
Unrecorded unconditional purchase obligation $ 1,100        
Deepwater Horizon Oil Spill Multi District Litigation          
Loss Contingencies [Line Items]          
Claims dismissed | claim     11 11  
BELO/ORM | Subsequent Event          
Loss Contingencies [Line Items]          
Claims dismissed | claim 750        
Claims filed | claim 2,385        
BELO/NRC | Subsequent Event          
Loss Contingencies [Line Items]          
Claims dismissed | claim 65        
Claims filed | claim 230        
BP counter claims ORM and NRC          
Loss Contingencies [Line Items]          
Claims filed | claim   4      
BP counterclaim ORM insurer          
Loss Contingencies [Line Items]          
Claims filed | claim   2      
Ocean Services          
Loss Contingencies [Line Items]          
Unrecorded unconditional purchase obligation, due in remainder of 2020         20,864
Unrecorded unconditional purchase obligation, due within 2021         30,993
Unrecorded unconditional purchase obligation, due within 2022         2,636
Unrecorded unconditional purchase obligation         $ 54,493
Ocean Services | U.S.-flag - Harbor Tugs          
Loss Contingencies [Line Items]          
Number of equipment committed to purchase | equipment         4
Ocean Services | Foreign-flag Rail Ferries          
Loss Contingencies [Line Items]          
Number of equipment committed to purchase | vessel         2
Inland Services          
Loss Contingencies [Line Items]          
Unrecorded unconditional purchase obligation, due in remainder of 2020         $ 6,318
Unrecorded unconditional purchase obligation, due within 2021         0
Unrecorded unconditional purchase obligation, due within 2022         0
Unrecorded unconditional purchase obligation         $ 6,318
Inland Services | Inland River Dry-Cargo Barges          
Loss Contingencies [Line Items]          
Number of equipment committed to purchase | equipment         6
Inland Services | Inland River Towboat          
Loss Contingencies [Line Items]          
Number of equipment committed to purchase | vessel         2
Other Segment          
Loss Contingencies [Line Items]          
Unrecorded unconditional purchase obligation, due in remainder of 2020         $ 226
Unrecorded unconditional purchase obligation, due within 2021         0
Unrecorded unconditional purchase obligation, due within 2022         0
Unrecorded unconditional purchase obligation         $ 226