v3.26.3
Basis of Presentation and Accounting Policies - Additional Information (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Dec. 31, 2024
Basis Of Presentation And Accounting Policies [Line Items]            
Unearned revenue $ 872,000   $ 872,000   $ 1,096,000 $ 2,534,000
Capitalized interest costs, including allowance for funds used during construction, total     3,400,000 $ 1,500,000    
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]     (Losses) Gains on Asset Dispositions and Impairments, Net (Losses) Gains on Asset Dispositions and Impairments, Net    
Equity method investment, other than temporary impairment     $ 0 $ 0    
Effective income tax rate reconciliation, percent     48.90%      
Class of warrant or right, exercise price of warrants or rights $ 0.01   $ 0.01      
Diluted earnings per share 26,157,107 25,887,710 26,006,085 26,409,312    
Performance Stock            
Basis Of Presentation And Accounting Policies [Line Items]            
Diluted earnings per share   15,710        
Restricted Stock            
Basis Of Presentation And Accounting Policies [Line Items]            
Diluted earnings per share   163,749        
Antidilutive securities excluded from computation of loss per share, amount 1,057,069 1,185,624 1,057,069 1,349,373    
Employee Stock Option            
Basis Of Presentation And Accounting Policies [Line Items]            
Diluted earnings per share   50,443        
Antidilutive securities excluded from computation of loss per share, amount 986,069 958,422 986,069 1,008,865    
Offshore Support Vessels            
Basis Of Presentation And Accounting Policies [Line Items]            
Estimated useful life (Year) 20 years   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%   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%   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   true      
Change in accounting principle, accounting standards update, immaterial effect [true false] true   true