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Acquisitions (Details) | Oct. 11, 2016 USD ($) State | Jun. 30, 2016 USD ($) Vessel bbl | Jun. 02, 2016 USD ($) Vessel | Apr. 15, 2016 USD ($) Vessel bbl | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
--- | --- | --- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill acquired |  |  |  |  | $ 598,131,000 | $ 586,718,000
Valley Power Systems Northwest, Inc. [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Purchase price | $ 11,440,000 |  |  |  |  |
Number of western states included in distributor agreement | State | 9 |  |  |  |  |
Goodwill acquired | $ 8,330,000 |  |  |  |  |
Intangible assets acquired | $ 2,070,000 |  |  |  |  |
Weighted average amortization period of intangibles | 15 years |  |  |  |  |
TD Equipment Finance, Inc. [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash paid for acquisition |  | $ 13,682,000 |  |  |  |
TD Equipment Finance, Inc. [Member] | Coastal Tank Barge [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of maritime vessels | Vessel |  | 1 |  |  |  |
Tank barge barrel capacity | bbl |  | 80,000 |  |  |  |
Crosby Marine Transportation LLC [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash paid for acquisition |  |  | $ 26,450,000 |  |  |
Crosby Marine Transportation LLC [Member] | Coastal Tugboats [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of maritime vessels | Vessel |  |  | 4 |  |  |
Average age of property |  |  | 13 years |  |  |
SEACOR Holdings Inc. [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Purchase price |  |  |  | $ 89,181,000 |  |
Cash paid for acquisition |  |  |  | 85,500,000 |  |
Ownership transferred, value |  |  |  | 3,681,000 |  |
Goodwill acquired |  |  |  | 985,000 |  |
Intangible assets acquired |  |  |  | $ 0 |  |
SEACOR Holdings Inc. [Member] | Inland Tank Barges [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of maritime vessels | Vessel |  |  |  | 27 |  |
Tank barge barrel capacity | bbl |  |  |  | 30,000 |  |
Average age of property |  |  |  | 10 years |  |
SEACOR Holdings Inc. [Member] | Inland Towboats [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of maritime vessels | Vessel |  |  |  | 14 |  |

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