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Acquisitions, 2016 (Details) $ in Thousands |  |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 28, 2018 USD ($) TankBarge | Dec. 14, 2018 USD ($) TankBarge bbl | Nov. 30, 2018 USD ($) Towboat | Oct. 11, 2016 USD ($) State | Jun. 30, 2016 USD ($) TankBarge bbl | Jun. 02, 2016 USD ($) Tugboat | Apr. 15, 2016 USD ($) TankBarge Towboat bbl | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Acquisitions [Abstract] |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  |  | $ 301,861 | $ 177,222 | $ 231,066
Inland Tank Barges [Member] |  |  |  |  |  |  |  |  |  |
Acquisitions [Abstract] |  |  |  |  |  |  |  |  |  |
Purchase price | $ 3,120 | $ 28,500 |  |  |  |  |  |  |  |
Number of maritime vessels acquired | TankBarge | 3 | 27 |  |  |  |  |  |  |  |
Tank barge barrel capacity (in barrels) | bbl |  | 306,000 |  |  |  |  |  |  |  |
Average age of property |  | 8 years |  |  |  |  |  |  |  |
Inland Towboats [Member] |  |  |  |  |  |  |  |  |  |
Acquisitions [Abstract] |  |  |  |  |  |  |  |  |  |
Purchase price |  |  | $ 3,050 |  |  |  |  |  |  |
Number of maritime vessels acquired | Towboat |  |  | 1 |  |  |  |  |  |  |
Valley Power Systems Northwest, Inc. [Member] |  |  |  |  |  |  |  |  |  |
Acquisitions [Abstract] |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  | $ 11,440 |  |  |  |  |  |
Goodwill acquired |  |  |  | 8,330 |  |  |  |  |  |
Intangible assets acquired |  |  |  | $ 2,070 |  |  |  |  |  |
Weighted average amortization period of intangibles |  |  |  | 15 years |  |  |  |  |  |
Number of western states included in distributor agreement | State |  |  |  | 9 |  |  |  |  |  |
TD Equipment Finance, Inc. [Member] | Coastal Tank Barge [Member] |  |  |  |  |  |  |  |  |  |
Acquisitions [Abstract] |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  | $ 13,682 |  |  |  |  |
Number of maritime vessels acquired | TankBarge |  |  |  |  | 1 |  |  |  |  |
Tank barge barrel capacity (in barrels) | bbl |  |  |  |  | 80,000 |  |  |  |  |
Crosby Marine Transportation LLC [Member] | Coastal Tugboats [Member] |  |  |  |  |  |  |  |  |  |
Acquisitions [Abstract] |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  | $ 26,450 |  |  |  |
Number of maritime vessels acquired | Tugboat |  |  |  |  |  | 4 |  |  |  |
Average age of property |  |  |  |  |  | 13 years |  |  |  |
SEACOR Holdings Inc. [Member] |  |  |  |  |  |  |  |  |  |
Acquisitions [Abstract] |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  | $ 89,181 |  |  |
Cash paid for acquisition |  |  |  |  |  |  | 85,500 |  |  |
Ownership transferred, value |  |  |  |  |  |  | 3,681 |  |  |
Goodwill acquired |  |  |  |  |  |  | 985 |  |  |
Intangible assets acquired |  |  |  |  |  |  | $ 0 |  |  |
SEACOR Holdings Inc. [Member] | Inland Tank Barges [Member] |  |  |  |  |  |  |  |  |  |
Acquisitions [Abstract] |  |  |  |  |  |  |  |  |  |
Number of maritime vessels acquired | TankBarge |  |  |  |  |  |  | 27 |  |  |
Tank barge barrel capacity (in barrels) | bbl |  |  |  |  |  |  | 30,000 |  |  |
Average age of property |  |  |  |  |  |  | 10 years |  |  |
SEACOR Holdings Inc. [Member] | Inland Towboats [Member] |  |  |  |  |  |  |  |  |  |
Acquisitions [Abstract] |  |  |  |  |  |  |  |  |  |
Number of maritime vessels acquired | Towboat |  |  |  |  |  |  | 14 |  |  |

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