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Basis of Presentation and Accounting Policies - Additional Information (Details) - USD ($)
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Dec. 31, 2024
Basis Of Presentation And Accounting Policies [Line Items]        
Unearned revenue $ 922,000   $ 1,096,000 $ 2,534,000
Capitalized interest costs, including allowance for funds used during construction, total 1,000,000 $ 0    
Impairment of long-lived assets owned or leased in vessels $ 0 $ 0    
Impairment, Long-Lived Asset, Held-for-Use, Statement of Income or Comprehensive Income [Extensible Enumeration] Gains on Asset Dispositions and Impairments, Net Gains on Asset Dispositions and Impairments, Net    
Assets held for sale $ 13,376,000   $ 10,812,000  
Equity method investment, other than temporary impairment $ 0 $ 0    
Effective income tax rate reconciliation, percent 16.20%      
Class of warrant or right, exercise price of warrants or rights $ 0.01      
Restricted Stock        
Basis Of Presentation And Accounting Policies [Line Items]        
Antidilutive securities excluded from computation of loss per share, amount 1,027,186 1,266,954    
Employee Stock Option        
Basis Of Presentation And Accounting Policies [Line Items]        
Antidilutive securities excluded from computation of loss per share, amount 1,006,365 1,008,865    
Offshore Support Vessels        
Basis Of Presentation And Accounting Policies [Line Items]        
Estimated useful life (Year) 20 years      
Platform Supply Vessel One [Member] | UNITED STATES        
Basis Of Presentation And Accounting Policies [Line Items]        
Assets held for sale $ 5,500,000      
Platform Supply Vessel | Middle East and Asia        
Basis Of Presentation And Accounting Policies [Line Items]        
Assets held for sale 500,000      
Liftboats 1 | UNITED STATES        
Basis Of Presentation And Accounting Policies [Line Items]        
Assets held for sale 3,200,000      
Liftboats 2 | UNITED STATES        
Basis Of Presentation And Accounting Policies [Line Items]        
Assets held for sale 3,200,000      
Fast Support Vessel | Africa and Europe        
Basis Of Presentation And Accounting Policies [Line Items]        
Assets held for sale $ 900,000      
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%      
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 2023-09        
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