Investments, at Equity, and Advances to 50% or Less Owned Companies - Schedule of Equity Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023
Schedule Of Investments [Line Items]
Investments at equity	$ 2,046	$ 4,125	$ 3,900
Seabulk Angola
Schedule Of Investments [Line Items]
Ownership percentage	49.00%
Investments at equity	$ 337	1,668
SEACOR Marine Arabia
Schedule Of Investments [Line Items]
Ownership percentage	45.00%
Investments at equity	$ 1,637	2,385
Other Offshore Marine Services Joint Ventures
Schedule Of Investments [Line Items]
Investments at equity	$ 72	$ 72
Other Offshore Marine Services Joint Ventures | Minimum
Schedule Of Investments [Line Items]
Ownership percentage	20.00%
Other Offshore Marine Services Joint Ventures | Maximum
Schedule Of Investments [Line Items]
Ownership percentage	50.00%		50.00%