Basis of Presentation and Accounting Policies - Additional Information (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2024 USD ($) $ / shares shares	Sep. 30, 2023 shares	Sep. 30, 2024 USD ($) $ / shares shares	Sep. 30, 2023 USD ($) Equipment shares	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Basis Of Presentation And Accounting Policies [Line Items]
Unearned revenue	$ 2,472,000		$ 2,472,000		$ 687,000	$ 2,333,000
Estimated useful life (Year)	20 years		20 years
Capitalized interest costs, including allowance for funds used during construction, total			$ 0	$ 0
Assets held for sale	$ 0		$ 0		500,000
Impairment, Long-Lived Asset, Held-for-Use, Statement of Income or Comprehensive Income [Extensible Enumeration]			Gains (Losses) on Asset Dispositions and Impairments, Net	Gains (Losses) on Asset Dispositions and Impairments, Net
Impairment of long-lived assets owned or leased in vessels			$ 0
Equity method investment, other than temporary impairment			$ 0	$ 0
Effective income tax rate reconciliation, percent, total			(0.50%)
Class of warrant or right, exercise price of warrants or rights | $ / shares	$ 0.01		$ 0.01
Convertible Debt Securities
Basis Of Presentation And Accounting Policies [Line Items]
Antidilutive securities excluded from computation of loss per share, amount | shares	2,978,724	2,978,724	2,978,724	2,978,724
Restricted Stock
Basis Of Presentation And Accounting Policies [Line Items]
Antidilutive securities excluded from computation of loss per share, amount | shares	1,392,226	1,642,084	1,392,226	1,642,084
Employee Stock Option
Basis Of Presentation And Accounting Policies [Line Items]
Antidilutive securities excluded from computation of loss per share, amount | shares	1,013,865	1,026,031	1,013,865	1,026,031
Anchor Handling Towing Supply Vessel
Basis Of Presentation And Accounting Policies [Line Items]
Impairment of long-lived assets owned or leased in vessels				$ 300,000	$ 700,000
Number of operating leases on equipment | Equipment				1
Equity Investments in 50% or Less Owned Companies | Minimum
Basis Of Presentation And Accounting Policies [Line Items]
Equity method investment, ownership percentage	20.00%		20.00%
Equity Investments in 50% or Less Owned Companies | Maximum
Basis Of Presentation And Accounting Policies [Line Items]
Equity method investment, ownership percentage	50.00%	50.00%	50.00%	50.00%
Equity Investments in 50% or Less Owned Companies | SEACOR Marine Foreign Holdings | Minimum
Basis Of Presentation And Accounting Policies [Line Items]
Equity method investment, ownership percentage	50.00%		50.00%