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Acquisitions, 2017 (Details)								1 Months Ended	12 Months Ended
	Dec. 28, 2018 USD ($) TankBarge	Dec. 14, 2018 USD ($) TankBarge bbl	Nov. 30, 2018 USD ($) Towboat	Mar. 15, 2018 USD ($) TankBarge	Oct. 20, 2017 USD ($)	Sep. 13, 2017 USD ($) $ / shares shares	Jul. 10, 2017 USD ($) bbl hp TankBarge Towboat	Jul. 31, 2017 USD ($) TankBarge	Dec. 31, 2019 USD ($) TankBarge	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Acquisitions [Abstract]
Purchase price									$ 248,164,000	$ 301,861,000	$ 177,222,000
Inland Pressure Tank Barges [Member]
Acquisitions [Abstract]
Purchase price				$ 10,400,000
Number of maritime vessels acquired | TankBarge				2
Average age of property				5 years
Inland Towboats [Member]
Acquisitions [Abstract]
Purchase price			$ 3,050,000
Number of maritime vessels acquired | Towboat			1
Inland Tank Barges [Member]
Acquisitions [Abstract]
Purchase price	$ 3,120,000	$ 28,500,000							$ 17,991,000
Number of maritime vessels acquired | TankBarge	3	27							9
Tank barge barrel capacity (in barrels) | bbl		306,000
Average age of property		8 years							5 years
Sneed Shipbuilding, Inc [Member]
Acquisitions [Abstract]
Cash paid for acquisition					$ 14,852,000
Stewart & Stevenson LLC [Member]
Acquisitions [Abstract]
Cash paid for acquisition						$ 377,935,000
Purchase price before post-closing adjustment and transaction fees						758,213,000
Assumption of debt						13,724,000
Stock consideration through issuance of Company common stock						$ 366,554,000
Issuance of shares (in shares) | shares						5,696,259
Price per share (in dollars per share) | $ / shares						$ 64.35
Term debt assumed						$ 12,135,000
Short-term secured loans						$ 1,589,000
Undisclosed Competitor [Member]
Acquisitions [Abstract]
Purchase price							$ 68,000,000
Property acquired							67,970,000
Intangible assets acquired							$ 30,000
Weighted average amortization period of intangibles							2 years
Undisclosed Competitor [Member] | Inland Pressure Tank Barges [Member]
Acquisitions [Abstract]
Number of maritime vessels acquired | TankBarge							9
Undisclosed Competitor [Member] | Barrel Tank Barges [Member]
Acquisitions [Abstract]
Number of maritime vessels acquired | TankBarge							4
Tank barge barrel capacity (in barrels) | bbl							30,000
Undisclosed Competitor [Member] | Inland Towboats [Member]
Acquisitions [Abstract]
Number of maritime vessels acquired | Towboat							3
Horsepower of inland towboats | hp							1,320
Undisclosed Competitor [Member] | Inland Tank Barges [Member]
Acquisitions [Abstract]
Number of maritime vessels acquired | TankBarge							13
Average age of property							5 years
Barge Fleeting and Marine Fueling Operation Business [Member]
Acquisitions [Abstract]
Cash paid for acquisition								$ 3,900,000
Barge Fleeting and Marine Fueling Operation Business [Member] | Inland Tank Barges [Member]
Acquisitions [Abstract]
Purchase price								$ 1,450,000
Number of maritime vessels acquired | TankBarge								4

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