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Summary of Significant Accounting Policies, Goodwill and Other Intangibles (Details) - USD ($) |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jan. 03, 2020 | May 10, 2018 | Feb. 14, 2018 | Mar. 31, 2020 | Dec. 31, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Goodwill [Abstract] |  |  |  |  |  |  |  |
Balance (gross) |  |  |  | $ 973,995,000 |  | $ 973,995,000 | $ 973,995,000 | $ 952,602,000
Accumulated impairment and amortization |  |  |  | (20,169,000) |  | (20,169,000) | (20,169,000) | (17,467,000)
Balance |  |  |  | 953,826,000 |  | 953,826,000 | 953,826,000 | 935,135,000
Impairment |  |  |  | (387,970,000) | $ (2,702,000) | (387,970,000) |  | (2,702,000)
Other |  |  |  |  |  |  |  | 620,000
Savage acquisition |  |  |  |  |  | 81,635,000 |  |
Balance (gross) |  |  |  |  | 973,995,000 | 1,065,939,000 | 973,995,000 | 973,995,000
Accumulated impairment and amortization |  |  |  |  | (20,169,000) | (408,139,000) | (20,169,000) | (20,169,000)
Balance |  |  |  |  | 953,826,000 | 657,800,000 | 953,826,000 | 953,826,000
Other Intangibles [Abstract] |  |  |  |  |  |  |  |
Other intangible assets - gross |  |  |  |  |  | 203,217,000 | 332,656,000 |
Accumulated amortization |  |  |  |  |  | (134,238,000) | (121,974,000) |
Other intangible assets - net |  |  |  |  |  | 68,979,000 | 210,682,000 |
Other intangible liabilities - gross |  |  |  |  |  | 13,860,000 | 13,860,000 |
Accumulated amortization |  |  |  |  |  | (10,960,000) | (7,956,000) |
Other intangible liabilities - net |  |  |  |  |  | 2,900,000 | 5,904,000 |
Amortization of intangible assets |  |  |  |  |  | 9,235,000 | 15,040,000 | 16,760,000
Intangible Assets and liabilities, Estimated Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |
2021 |  |  |  |  |  | 7,749,000 |  |
2022 |  |  |  |  |  | 7,466,000 |  |
2023 |  |  |  |  |  | 7,947,000 |  |
2024 |  |  |  |  |  | 8,513,000 |  |
2025 |  |  |  |  |  | $ 8,513,000 |  |
Weighted average amortization period for intangible assets and liabilities |  |  |  |  |  | 9 years |  |
Targa [Member] |  |  |  |  |  |  |  |
Goodwill [Abstract] |  |  |  |  |  |  |  |
Savage acquisition |  | $ 69,250,000 |  |  |  |  |  |
Goodwill acquired |  |  |  |  |  |  |  | 16,116,000
Higman [Member] |  |  |  |  |  |  |  |
Goodwill [Abstract] |  |  |  |  |  |  |  |
Savage acquisition |  |  | $ 421,922,000 |  |  |  |  |
Goodwill acquired |  |  |  |  |  |  |  | 4,657,000
Balance |  |  | $ 4,657,000 |  |  |  |  |
Convoy [Member] |  |  |  |  |  |  |  |
Goodwill [Abstract] |  |  |  |  |  |  |  |
Savage acquisition | $ 37,180,000 |  |  |  |  |  |  |
Goodwill acquired |  |  |  |  |  | $ 10,309,000 |  |
Balance | $ 10,309,000 |  |  |  |  |  |  |
Marine Transportation Segment [Member] |  |  |  |  |  |  |  |
Goodwill [Abstract] |  |  |  |  |  |  |  |
Balance (gross) |  |  |  | 424,149,000 |  | 424,149,000 | 424,149,000 | 403,376,000
Accumulated impairment and amortization |  |  |  | (18,574,000) |  | (18,574,000) | (18,574,000) | (15,872,000)
Balance |  |  |  | 405,575,000 |  | 405,575,000 | 405,575,000 | 387,504,000
Impairment |  |  |  |  |  | 0 |  | (2,702,000)
Other |  |  |  |  |  |  |  | 0
Savage acquisition |  |  |  |  |  | 81,635,000 |  |
Balance (gross) |  |  |  |  | 424,149,000 | 505,784,000 | 424,149,000 | 424,149,000
Accumulated impairment and amortization |  |  |  |  | (18,574,000) | (18,574,000) | (18,574,000) | (18,574,000)
Balance |  |  |  |  | 405,575,000 | 487,210,000 | 405,575,000 | 405,575,000
Marine Transportation Segment [Member] | Targa [Member] |  |  |  |  |  |  |  |
Goodwill [Abstract] |  |  |  |  |  |  |  |
Goodwill acquired |  |  |  |  |  |  |  | 16,116,000
Marine Transportation Segment [Member] | Higman [Member] |  |  |  |  |  |  |  |
Goodwill [Abstract] |  |  |  |  |  |  |  |
Goodwill acquired |  |  |  |  |  |  |  | 4,657,000
Marine Transportation Segment [Member] | Convoy [Member] |  |  |  |  |  |  |  |
Goodwill [Abstract] |  |  |  |  |  |  |  |
Goodwill acquired |  |  |  |  |  | 0 |  |
Distribution and Services Segment [Member] |  |  |  |  |  |  |  |
Goodwill [Abstract] |  |  |  |  |  |  |  |
Balance (gross) |  |  |  | 549,846,000 |  | 549,846,000 | 549,846,000 | 549,226,000
Accumulated impairment and amortization |  |  |  | (1,595,000) |  | (1,595,000) | (1,595,000) | (1,595,000)
Balance |  |  |  | $ 548,251,000 |  | 548,251,000 | 548,251,000 | 547,631,000
Impairment |  |  |  |  |  | (387,970,000) |  | 0
Other |  |  |  |  |  |  |  | 620,000
Savage acquisition |  |  |  |  |  | 0 |  |
Balance (gross) |  |  |  |  | 549,846,000 | 560,155,000 | 549,846,000 | 549,846,000
Accumulated impairment and amortization |  |  |  |  | (1,595,000) | (389,565,000) | (1,595,000) | (1,595,000)
Balance |  |  |  |  | $ 548,251,000 | 170,590,000 | $ 548,251,000 | 548,251,000
Distribution and Services Segment [Member] | Targa [Member] |  |  |  |  |  |  |  |
Goodwill [Abstract] |  |  |  |  |  |  |  |
Goodwill acquired |  |  |  |  |  |  |  | 0
Distribution and Services Segment [Member] | Higman [Member] |  |  |  |  |  |  |  |
Goodwill [Abstract] |  |  |  |  |  |  |  |
Goodwill acquired |  |  |  |  |  |  |  | $ 0
Distribution and Services Segment [Member] | Convoy [Member] |  |  |  |  |  |  |  |
Goodwill [Abstract] |  |  |  |  |  |  |  |
Goodwill acquired |  |  |  |  |  | $ 10,309,000 |  |

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