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Revenues (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disaggregation of Revenue [Abstract] |  |  |
Revenues by major source | $ 2,970,697 | $ 2,214,418 | $ 1,770,673
Revenue recognized | 43,348 |  |
Marine Transportation [Member] |  |  |
Disaggregation of Revenue [Abstract] |  |  |
Revenues by major source | 1,483,143 | 1,324,106 | 1,471,893
Marine Transportation [Member] | Inland Transportation [Member] |  |  |
Disaggregation of Revenue [Abstract] |  |  |
Revenues by major source | 1,119,820 | 923,916 | 951,097
Marine Transportation [Member] | Coastal Transportation [Member] |  |  |
Disaggregation of Revenue [Abstract] |  |  |
Revenues by major source | 363,323 | 400,190 | 520,796
Distribution and Services [Member] |  |  |
Disaggregation of Revenue [Abstract] |  |  |
Revenues by major source | 1,487,554 | 890,312 | 298,780
Distribution and Services [Member] | Oil and Gas [Member] |  |  |
Disaggregation of Revenue [Abstract] |  |  |
Revenues by major source | 1,010,410 | 614,128 | 115,012
Distribution and Services [Member] | Commercial and Industrial [Member] |  |  |
Disaggregation of Revenue [Abstract] |  |  |
Revenues by major source | $ 477,144 | $ 276,184 | $ 183,768

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