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Revenues (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Disaggregation of Revenue [Abstract] |  |  |  |  |
Revenues by major source | $ 496,567,000 | $ 666,809,000 | $ 1,681,652,000 | $ 2,182,472,000 |
Revenue recognized |  |  | 37,153,000 | 75,105,000 |
Contract assets | 0 |  | 0 |  | $ 0
Marine Transportation [Member] |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Revenues by major source | 320,602,000 | 412,665,000 | 1,104,846,000 | 1,185,072,000 |
Marine Transportation [Member] | Inland Transportation [Member] |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Revenues by major source | 247,647,000 | 316,000,000 | 869,224,000 | 909,247,000 |
Marine Transportation [Member] | Coastal Transportation [Member] |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Revenues by major source | 72,955,000 | 96,665,000 | 235,622,000 | 275,825,000 |
Distribution and Services [Member] |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Revenues by major source | 175,965,000 | 254,144,000 | 576,806,000 | 997,400,000 |
Distribution and Services [Member] | Oil and Gas [Member] |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Revenues by major source | 48,741,000 | 118,096,000 | 158,043,000 | 540,061,000 |
Distribution and Services [Member] | Commercial and Industrial [Member] |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Revenues by major source | $ 127,224,000 | $ 136,048,000 | $ 418,763,000 | $ 457,339,000 |

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