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Subsequent Events (Details) bbl in Millions	Jan. 29, 2020 USD ($) bbl Towboat TankBarge	Jan. 03, 2020 USD ($)	Dec. 31, 2019 TankBarge	Dec. 28, 2018 TankBarge	Dec. 14, 2018 TankBarge	Nov. 30, 2018 Towboat
Inland Tank Barges [Member]
Acquisitions [Abstract]
Number of maritime vessels acquired | TankBarge			9	3	27
Inland Towboats [Member]
Acquisitions [Abstract]
Number of maritime vessels acquired | Towboat						1
Subsequent Events [Member] | Savage Inland Marine, LLC [Member]
Acquisitions [Abstract]
Cash paid for acquisition | $	$ 278,000,000
Subsequent Events [Member] | Savage Inland Marine, LLC [Member] | Inland Tank Barges [Member]
Acquisitions [Abstract]
Number of maritime vessels acquired | TankBarge	90
Aggregate tank barge barrel capacity (in barrels) | bbl	2.5
Subsequent Events [Member] | Savage Inland Marine, LLC [Member] | Inland Towboats [Member]
Acquisitions [Abstract]
Number of maritime vessels acquired | Towboat	46
Subsequent Events [Member] | Convoy [Member]
Acquisitions [Abstract]
Cash paid for acquisition | $		$ 40,000,000

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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