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Subsequent Event (Details) - Subsequent Events [Member] - Savage Inland Marine, LLC [Member] bbl in Millions	Apr. 01, 2020 USD ($) bbl TankBarge Towboat
Acquisitions [Abstract]
Cash paid for acquisition | $	$ 277,931,000
Inland Tank Barges [Member]
Acquisitions [Abstract]
Number of maritime vessels acquired | TankBarge	92
Aggregate tank barge barrel capacity (in barrels) | bbl	2.6
Inland Towboats [Member]
Acquisitions [Abstract]
Number of maritime vessels acquired | Towboat	46

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Refers to the number of maritime (seagoing) vessels acquired.

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
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-Publisher FASB
-Name Accounting Standards Codification
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