Subsequent Event (Details) $ in Thousands			3 Months Ended
Subsequent Event (Details) $ in Thousands	Apr. 23, 2024 USD ($) Towboat Barge Barrels	Jul. 14, 2023 USD ($) Barge Barrels	Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($)	Sep. 30, 2023 Barge
Subsequent Event [Line Items]
Cash paid for acquisition \| $			$ 81,047	$ 73,199
Subsequent Event [Member] \| Equipment Purchase Agreement [Member]
Subsequent Event [Line Items]
Cash paid for acquisition \| $	$ 65,000
Asset acquisition expected expiration term	2024-05
Inland Tank Barges [Member]
Subsequent Event [Line Items]
Number of tank barges \| Barge		23			4
Total capacity of barrels \| Barrels		265,000
Cash paid for acquisition \| $		$ 37,000
Average age		14 years
Inland Tank Barges [Member] \| Subsequent Event [Member] \| Equipment Purchase Agreement [Member]
Subsequent Event [Line Items]
Number of tank barges \| Barge	13
Total capacity of barrels \| Barrels	347,000
Average age	15 years
High Horsepower Towboats [Member] \| Subsequent Event [Member] \| Equipment Purchase Agreement [Member]
Subsequent Event [Line Items]
Number of horsepower towboats \| Towboat	2
Specialty Barges [Member] \| Subsequent Event [Member] \| Equipment Purchase Agreement [Member]
Subsequent Event [Line Items]
Number of tank barges \| Barge	3