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Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Accounts Receivable [Abstract] |  |  |
Accruals for revenues earned included in accounts receivable | $ 114,159 | $ 153,661 |
Receivables from insurance companies to cover claims in excess included in accounts receivable | $ 69,624 | 66,588 |
Drydocking on Ocean-Going Vessels [Abstract] |  |  |
Period in which recertification of ocean going vessels occur twice | 5 years |  |
Recognized amortization of major maintenance costs | $ 20,760 | 21,207 | $ 19,869
Capitalized interest excluded from interest expense | $ 2,206 | $ 1,731 | $ 2,974
Minimum [Member] |  |  |
Drydocking on Ocean-Going Vessels [Abstract] |  |  |
Period of amortization of shipyard costs | 30 months |  |
Maximum [Member] |  |  |
Drydocking on Ocean-Going Vessels [Abstract] |  |  |
Period of amortization of shipyard costs | 60 months |  |
Marine Transportation Equipment [Member] | Minimum [Member] |  |  |
Property, Maintenance and Repairs [Abstract] |  |  |
Estimated useful lives of the individual assets | 5 years |  |
Marine Transportation Equipment [Member] | Maximum [Member] |  |  |
Property, Maintenance and Repairs [Abstract] |  |  |
Estimated useful lives of the individual assets | 40 years |  |
Buildings [Member] | Minimum [Member] |  |  |
Property, Maintenance and Repairs [Abstract] |  |  |
Estimated useful lives of the individual assets | 10 years |  |
Buildings [Member] | Maximum [Member] |  |  |
Property, Maintenance and Repairs [Abstract] |  |  |
Estimated useful lives of the individual assets | 40 years |  |
Other Equipment [Member] | Minimum [Member] |  |  |
Property, Maintenance and Repairs [Abstract] |  |  |
Estimated useful lives of the individual assets | 2 years |  |
Other Equipment [Member] | Maximum [Member] |  |  |
Property, Maintenance and Repairs [Abstract] |  |  |
Estimated useful lives of the individual assets | 10 years |  |

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