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Acquisitions, 2019 (Details) |  | 12 Months Ended
--- | --- | ---
Mar. 14, 2019 USD ($) bbl Towboat Tankbarge | Dec. 31, 2021 USD ($) Vessel | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) Tankbarge
Acquisitions [Abstract] |  |  |  |
Purchase price |  | $ 98,015,000 | $ 148,185,000 | $ 248,164,000
Inland Tank Barges [Member] |  |  |  |
Acquisitions [Abstract] |  |  |  |
Number of maritime vessels acquired |  | 4 |  | 9
Purchase price |  |  |  | $ 17,991,000
Average age of property |  |  | 5 years |
Cenac Marine Services, LLC [Member] |  |  |  |
Fair values of assets acquired and liabilities assumed, net [Abstract] |  |  |  |
Prepaid expenses | $ 1,138,000 |  |  |
Property and equipment | 247,122,000 |  |  |
Other intangibles | 340,000 |  |  |
Total assets | 248,600,000 |  |  |
Other long-term liabilities | 4,100,000 |  |  |
Net assets acquired | $ 244,500,000 |  |  |
Weighted average amortization period of intangibles |  |  | 2 years |
Weighted average amortization period of unfavorable contracts |  |  | 1 year 3 months 18 days |
Acquisition related costs |  |  |  | $ 442,000
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 | 1,833,000 |  |  |
Cenac Marine Services, LLC [Member] | Inland Towboats [Member] |  |  |  |
Acquisitions [Abstract] |  |  |  |
Number of maritime vessels acquired | Towboat | 34 |  |  |
Average age of property |  |  | 7 years |
Cenac Marine Services, LLC [Member] | Offshore Tugboats [Member] |  |  |  |
Acquisitions [Abstract] |  |  |  |
Number of maritime vessels acquired | Towboat | 2 |  |  |

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