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Subsequent Events (Details) $ in Millions | Jan. 29, 2019 USD ($) bbl TankBarge Towboat Tugboat | Nov. 30, 2018 Towboat
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Inland Towboats [Member] |  |
Acquisitions [Abstract] |  |
Number of maritime vessels acquired | Towboat |  | 1
Subsequent Event [Member] | Cenac Marine Services, LLC [Member] |  |
Acquisitions [Abstract] |  |
Cash paid for acquisition | $ | $ 244 |
Subsequent Event [Member] | Cenac Marine Services, LLC [Member] | Inland Barrel Tank Barges [Member] |  |
Acquisitions [Abstract] |  |
Number of maritime vessels acquired | TankBarge | 63 |
Tank barge barrel capacity (in barrels) | bbl | 30,000 |
Aggregate tank barge barrel capacity (in barrels) | bbl | 1,900,000 |
Subsequent Event [Member] | Cenac Marine Services, LLC [Member] | Inland Towboats [Member] |  |
Acquisitions [Abstract] |  |
Number of maritime vessels acquired | Towboat | 34 |
Subsequent Event [Member] | Cenac Marine Services, LLC [Member] | Offshore Tugboats [Member] |  |
Acquisitions [Abstract] |  |
Number of maritime vessels acquired | Tugboat | 2 |

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