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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 |  |

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