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Contingencies and Commitments (Details)
 12 Months Ended
Dec. 31, 2015
USD ($)
PotentiallyResponsibleParty
Individual
Spill
Segment
Dec. 31, 2014
Segment
Dec. 31, 2013
Segment
Certain Significant Risks and Uncertainties [Abstract]      
Customer relationship period 40 years    
Number of single customers accounting more than 10% of segment revenue | Segment 0 0 0
Percentage of customers revenue 10.00% 10.00% 10.00%
Segment operates authorized distributors | Segment 17    
Diesel engine services segment's relationship 50 years    
Guarantor Obligations [Line Items]      
Issued guaranties | $ $ 19,968,000    
Guarantor Obligations, Term All of these instruments have an expiration date within four years.    
Performance Bonds [Member]      
Guarantor Obligations [Line Items]      
Issued guaranties | $ $ 13,669,000    
Standby Letters of Credit [Member]      
Guarantor Obligations [Line Items]      
Issued guaranties | $ $ 6,299,000    
Gulfco Marine Superfund Site [Member]      
Site Contingency [Line Items]      
Number of other companies also named as Potentially Responsible Parties ("PRPs") 3    
Number of companies named as Potentially Responsible Parties ("PRPs") 4    
EPA incurred cleanup expense | $ $ 9,943,000    
EPA oversight costs | $ $ 2,258,000    
Number of defendants seeking contribution and indemnity under CERCLA | Individual 21    
Portland Harbor Superfund Site [Member]      
Site Contingency [Line Items]      
Number of other companies also named as Potentially Responsible Parties ("PRPs") 250    
Number of spills | Spill 4    
Palmer Barge Line Superfund Site [Member]      
Site Contingency [Line Items]      
Number of other companies also named as Potentially Responsible Parties ("PRPs") 45    
Number of other companies also in an investigation and feasibility study agreement with EPA 3    
Number of new companies in an agreement with the EPA 5    
Number of Potentially Responsible Parties notified by EPA of intent to recover costs 30    
EPA notification intent to recover costs incurred | $ $ 2,949,000    
Marine Transportation's [Member]      
Certain Significant Risks and Uncertainties [Abstract]      
Percentage of inland revenue 80.00%    
Percentage of costal revenue 80.00%    
Number of single customers accounting more than 10% of segment revenue | Segment 0 0 0
Marine Transportation's [Member] | Minimum [Member]      
Certain Significant Risks and Uncertainties [Abstract]      
Range of renewal options under term contracts 1 year    
Marine Transportation's [Member] | Maximum [Member]      
Certain Significant Risks and Uncertainties [Abstract]      
Range of renewal options under term contracts 3 years