Investments, at Equity, and Advances to 50% or Less Owned Companies - Schedule of Equity Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021
Schedule Of Investments [Line Items]
Investments at equity	$ 1,901	$ 71,727
MexMar
Schedule Of Investments [Line Items]
Ownership percentage	49.00%
Investments at equity		59,940
SEACOR Marlin LLC
Schedule Of Investments [Line Items]
Ownership percentage	49.00%
Investments at equity		6,958
Seabulk Angola
Schedule Of Investments [Line Items]
Ownership percentage	49.00%
Investments at equity	$ 1,688	1,081
Offshore Vessel Holdings
Schedule Of Investments [Line Items]
Ownership percentage	49.00%
Investments at equity		1,847
SEACOR Arabia
Schedule Of Investments [Line Items]
Ownership percentage	45.00%
Investments at equity	$ 137	1,821
Other Offshore Marine Services Joint Ventures
Schedule Of Investments [Line Items]
Investments at equity	$ 76	$ 80	$ 77,400
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%