Basis of Presentation and Accounting Policies - Additional Information (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2021
Basis Of Presentation And Accounting Policies [Line Items]
Deferred revenue	$ 0
Unearned revenue	1,487,000		$ 2,333,000	$ 1,606,000
Insurance receivables related to costs that were recorded as operating expenses	2,200,000
Capitalized interest costs, including allowance for funds used during construction, total	$ 0	$ 0
Impairment, Long-Lived Asset, Held-for-Use, Statement of Income or Comprehensive Income [Extensible Enumeration]	Gains 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	12.89%
Class of warrant or right, exercise price of warrants or rights	$ 0.01
Convertible Debt Securities
Basis Of Presentation And Accounting Policies [Line Items]
Antidilutive securities excluded from computation of loss per share, amount	2,978,274	2,907,500
Restricted Stock
Basis Of Presentation And Accounting Policies [Line Items]
Antidilutive securities excluded from computation of loss per share, amount	1,672,932	1,469,647
Employee Stock Option
Basis Of Presentation And Accounting Policies [Line Items]
Antidilutive securities excluded from computation of loss per share, amount	1,026,031	1,029,365
Fast Support Vessel
Basis Of Presentation And Accounting Policies [Line Items]
Impairment charges		$ 900,000	900,000
Anchor Handling Towing Supply Vessel
Basis Of Presentation And Accounting Policies [Line Items]
Impairment of long-lived assets owned or leased in vessels			700,000
Tower and Gangway
Basis Of Presentation And Accounting Policies [Line Items]
Impairment charges			$ 1,300,000
Offshore Support Vessels
Basis Of Presentation And Accounting Policies [Line Items]
Estimated useful life (Year)	20 years
Equity Investments in 50% or Less Owned Companies | Minimum
Basis Of Presentation And Accounting Policies [Line Items]
Equity method investment, ownership percentage	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%
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%
Accounting Standards Update 2020-10
Basis Of Presentation And Accounting Policies [Line Items]
Change in accounting principle, accounting standards update, adopted [true false]	true
Change in accounting principle, accounting standards update, immaterial effect [true false]	true
Accounting Standards Update 2020-06
Basis Of Presentation And Accounting Policies [Line Items]
Change in accounting principle, accounting standards update, adopted [true false]	true
Change in accounting principle, accounting standards update, adoption date	Jan. 01, 2022
Change in accounting principle, accounting standards update, immaterial effect [true false]	true