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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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