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Acquisitions, 2018 (Details)
12 Months Ended
Dec. 28, 2018
USD ($)
TankBarge
Dec. 14, 2018
USD ($)
bbl
TankBarge
Nov. 30, 2018
USD ($)
Towboat
May 10, 2018
USD ($)
TankBarge
bbl
Mar. 15, 2018
USD ($)
TankBarge
Feb. 14, 2018
USD ($)
bbl
TankBarge
Towboat
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
TankBarge
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Acquisitions [Abstract]                    
Purchase price             $ 148,185,000 $ 248,164,000 $ 301,861,000  
Cash paid for acquisition             81,635,000      
Fair values of assets acquired and liabilities assumed, net [Abstract]                    
Goodwill             $ 657,800,000 953,826,000 $ 953,826,000 $ 935,135,000
Inland Tank Barges [Member]                    
Acquisitions [Abstract]                    
Purchase price $ 3,120,000 $ 28,500,000           $ 17,991,000    
Number of maritime vessels acquired | TankBarge 3 27           9    
Tank barge barrel capacity (in barrels) | bbl   306,000                
Average age of property   8 years         5 years      
Inland Towboats [Member]                    
Acquisitions [Abstract]                    
Purchase price     $ 3,050,000              
Number of maritime vessels acquired | Towboat     1              
Inland Pressure Tank Barges [Member]                    
Acquisitions [Abstract]                    
Purchase price         $ 10,400,000          
Number of maritime vessels acquired | TankBarge         2          
Average age of property         5 years          
Targa [Member]                    
Acquisitions [Abstract]                    
Cash paid for acquisition       $ 69,250,000            
Goodwill acquired       16,116,000            
Intangible assets acquired       $ 11,000,000            
Weighted average amortization period of intangibles       15 years            
Targa [Member] | Inland Pressure Tank Barges [Member]                    
Acquisitions [Abstract]                    
Number of maritime vessels acquired | TankBarge       16            
Tank barge barrel capacity (in barrels) | bbl       258,000            
Average age of property       15 years            
Higman [Member]                    
Acquisitions [Abstract]                    
Cash paid for acquisition           $ 421,922,000        
Goodwill acquired           4,657,000        
Intangible assets acquired           $ 11,100,000        
Weighted average amortization period of intangibles           4 years 10 months 24 days        
Acquisition related costs           $ 3,464,000        
Fair values of assets acquired and liabilities assumed, net [Abstract]                    
Net assets acquired           421,922,000        
Cash           2,313,000        
Accounts receivable           27,527,000        
Prepaid expenses and other current assets           5,323,000        
Property and equipment           497,951,000        
Goodwill           4,657,000        
Other assets           30,000        
Total assets           537,801,000        
Accounts payable           17,012,000        
Accrued liabilities           14,127,000        
Deferred revenues           40,524,000        
Other long-term liabilities           44,216,000        
Total liabilities           $ 115,879,000        
Higman [Member] | Inland Tank Barges [Member]                    
Acquisitions [Abstract]                    
Number of maritime vessels acquired | TankBarge           163        
Aggregate tank barge barrel capacity (in barrels) | bbl           4,800,000        
Average age of property           7 years        
Higman [Member] | Inland Towboats [Member]                    
Acquisitions [Abstract]                    
Number of maritime vessels acquired | Towboat           75        
Average age of property           8 years