Annual report pursuant to Section 13 and 15(d)

Investments, At Equity, And Advances To 50% Or Less Owned Companies (Investments, At Equity, And Advances To 50% Or Less Owned Companies) (Details)

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Investments, At Equity, And Advances To 50% Or Less Owned Companies (Investments, At Equity, And Advances To 50% Or Less Owned Companies) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Jun. 01, 2015
Schedule of Equity Method Investments [Line Items]          
Equity Method Investments $ 173,441     $ 175,461  
Trailer Bridge Inc [Member]          
Schedule of Equity Method Investments [Line Items]          
Ownership of equity interest       55.30%  
RF Vessel Holdings [Member]          
Schedule of Equity Method Investments [Line Items]          
Ownership of equity interest 50.00%        
Golfo de Mexico [Member]          
Schedule of Equity Method Investments [Line Items]          
Ownership of equity interest     50.00%    
KSM [Member]          
Schedule of Equity Method Investments [Line Items]          
Ownership of equity interest   50.00%      
VA&E [Member]          
Schedule of Equity Method Investments [Line Items]          
Ownership of equity interest       41.30% 81.10%
Shipping Services [Member] | Trailer Bridge Inc [Member]          
Schedule of Equity Method Investments [Line Items]          
Ownership of equity interest 55.30%        
Equity Method Investments $ 47,324     $ 43,050  
Shipping Services [Member] | RF Vessel Holdings [Member]          
Schedule of Equity Method Investments [Line Items]          
Ownership of equity interest 50.00%        
Equity Method Investments $ 2,378     0  
Shipping Services [Member] | Golfo de Mexico [Member]          
Schedule of Equity Method Investments [Line Items]          
Ownership of equity interest 50.00%        
Equity Method Investments $ 2,500     0  
Shipping Services [Member] | KSM [Member]          
Schedule of Equity Method Investments [Line Items]          
Ownership of equity interest 50.00%        
Equity Method Investments $ (199)     0  
Shipping Services [Member] | SeaJon          
Schedule of Equity Method Investments [Line Items]          
Ownership of equity interest 50.00%        
Equity Method Investments $ 0     8,570  
Shipping Services [Member] | Shipping Services Joint Ventures [Member]          
Schedule of Equity Method Investments [Line Items]          
Equity Method Investments $ 52,003     51,620  
Inland River Services [Member] | SCFCo Holdings          
Schedule of Equity Method Investments [Line Items]          
Ownership of equity interest 50.00%        
Equity Method Investments $ 42,126     46,028  
Inland River Services [Member] | Bunge-SCF Grain [Member]          
Schedule of Equity Method Investments [Line Items]          
Ownership of equity interest 50.00%        
Equity Method Investments $ 16,166     16,176  
Inland River Services [Member] | SCF Bunge Marine [Member]          
Schedule of Equity Method Investments [Line Items]          
Ownership of equity interest 57.00%        
Equity Method Investments $ 5,404     4,233  
Inland River Services [Member] | Other Inland River Joint Ventures [Member]          
Schedule of Equity Method Investments [Line Items]          
Ownership of equity interest 50.00%        
Equity Method Investments $ 2,783     2,744  
Inland River Services [Member] | Inland River Joint Venture [Member]          
Schedule of Equity Method Investments [Line Items]          
Equity Method Investments $ 66,479     69,181  
Witt O'Brien's LLC [Member] | Witt O'Brien's do Brazil [Member]          
Schedule of Equity Method Investments [Line Items]          
Ownership of equity interest 50.00%        
Equity Method Investments $ 777     566  
Corporate and Other [Member]          
Schedule of Equity Method Investments [Line Items]          
Equity Method Investments $ 54,182     54,094  
Corporate and Other [Member] | Hawker Pacific Airservices Limited [Member]          
Schedule of Equity Method Investments [Line Items]          
Ownership of equity interest 34.20%        
Equity Method Investments $ 21,681     20,418  
Corporate and Other [Member] | VA&E [Member]          
Schedule of Equity Method Investments [Line Items]          
Ownership of equity interest 41.30%        
Equity Method Investments $ 13,596     11,133  
Corporate and Other [Member] | Avion Pacific Limited [Member]          
Schedule of Equity Method Investments [Line Items]          
Ownership of equity interest 39.10%        
Equity Method Investments $ 11,400     14,783  
Corporate and Other [Member] | Cleancor [Member]          
Schedule of Equity Method Investments [Line Items]          
Ownership of equity interest 50.00%        
Equity Method Investments $ 5,134     5,373  
Corporate and Other [Member] | Other Corporate Joint Ventures [Member]          
Schedule of Equity Method Investments [Line Items]          
Equity Method Investments $ 2,371     $ 2,387  
Corporate and Other [Member] | Other Corporate Joint Ventures [Member] | Minimum [Member]          
Schedule of Equity Method Investments [Line Items]          
Ownership of equity interest 34.00%        
Corporate and Other [Member] | Other Corporate Joint Ventures [Member] | Maximum [Member]          
Schedule of Equity Method Investments [Line Items]          
Ownership of equity interest 47.50%