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Nature of Operations and Accounting Policies - Additional Information (Details)
12 Months Ended
Dec. 31, 2022
USD ($)
Segment
Vessel
$ / shares
shares
Dec. 31, 2021
USD ($)
shares
Dec. 31, 2020
USD ($)
shares
Sep. 30, 2022
Sep. 29, 2022
Vessel
Dec. 31, 2019
USD ($)
Nature Of Operations And Accounting Policies [Line Items]            
Number of reportable segments | Segment 4          
Contract with customer, liability   $ 321,000 $ 3,307,000     $ 4,755,000
Inventory reserves $ 0 0 0      
Net book value 656,905,000 705,752,000 721,335,000      
Capitalized interest costs, including allowance for funds used during construction, total 0 300,000 900,000      
Impairment of long-lived assets held-for-use $ 2,900,000 0        
Impairment, Long-Lived Asset, Held-for-Use, Statement of Income or Comprehensive Income [Extensible Enumeration] Gain Loss On Sales Of Assets And Asset Impairment Charges          
Unearned revenue related to new contract agreements $ 4,300,000          
Unearned revenue previously recorded recognized 3,300,000          
Deferred revenue 0          
Gain Contingency on costs for drydocking and repair expenditures, incurred 5,600,000          
Equity method investment, other than temporary impairment $ 0 $ 0 $ 0      
Class of warrant or right, exercise price of warrants or rights | $ / shares $ 0.01          
Number of shares outstanding | shares   1,163,090        
Accounting Standards Update 2020-06            
Nature Of Operations 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          
Accounting Standards Update 2020-10            
Nature Of Operations 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 2019-12            
Nature Of Operations 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          
Performance Share Awards            
Nature Of Operations And Accounting Policies [Line Items]            
Number of shares issued | shares 184,930 157,455 149,200      
Number of shares outstanding | shares 216,172 354,964 240,800      
Fast Support Vessel            
Nature Of Operations And Accounting Policies [Line Items]            
Impairment charges $ 900,000          
Anchor Handling Towing Supply            
Nature Of Operations And Accounting Policies [Line Items]            
Impairment of long-lived assets held-for-use 700,000          
Tower and Gangway            
Nature Of Operations And Accounting Policies [Line Items]            
Impairment charges $ 1,300,000          
Restricted Stock            
Nature Of Operations And Accounting Policies [Line Items]            
Antidilutive securities excluded from computation of earnings per share, amount | shares 1,682,193 1,112,256 436,714      
Dilutive securities included in computation of earnings per share, amount | shares   50,834        
Employee Stock Option            
Nature Of Operations And Accounting Policies [Line Items]            
Antidilutive securities excluded from computation of earnings per share, amount | shares 1,026,865 1,061,357 1,120,541      
Convertible Debt Securities            
Nature Of Operations And Accounting Policies [Line Items]            
Antidilutive securities excluded from computation of earnings per share, amount | shares 2,978,274 2,907,500 2,907,500      
Continuing Operations            
Nature Of Operations And Accounting Policies [Line Items]            
Depreciation, total $ 56,000,000.0 $ 57,400,000 $ 57,200,000      
Discontinued Operations            
Nature Of Operations And Accounting Policies [Line Items]            
Depreciation, total $ 0 0 6,200,000      
Offshore Support Vessels            
Nature Of Operations And Accounting Policies [Line Items]            
Estimated useful life (Year) 20 years          
Vessels            
Nature Of Operations And Accounting Policies [Line Items]            
Contract with customer, liability, revenue recognized $ 2,300,000 1,300,000        
MexMar            
Nature Of Operations And Accounting Policies [Line Items]            
Number of vessels joint ventured | Vessel         19  
Equity method investment, ownership percentage [1] 49.00%          
OVH            
Nature Of Operations And Accounting Policies [Line Items]            
Number of vessels joint ventured | Vessel         19  
Equity method investment, ownership percentage 49.00%          
SEACOR Marlin LLC            
Nature Of Operations And Accounting Policies [Line Items]            
Number of vessels owned | Vessel         1  
Equity method investment, ownership percentage 49.00% [2]     100.00%    
Equity Investments in 50% or Less Owned Companies | Minimum            
Nature Of Operations And Accounting Policies [Line Items]            
Equity method investment, ownership percentage 20.00%          
Equity Investments in 50% or Less Owned Companies | Minimum | SEACOR Marine Foreign Holdings            
Nature Of Operations And Accounting Policies [Line Items]            
Equity method investment, ownership percentage 50.00%          
Equity Investments in 50% or Less Owned Companies | Maximum            
Nature Of Operations And Accounting Policies [Line Items]            
Equity method investment, ownership percentage 50.00%          
UNITED STATES            
Nature Of Operations And Accounting Policies [Line Items]            
Number of vessels | Vessel 16          
Number of vessels owned | Vessel 12          
Number of vessels leased-in | Vessel 2          
Number of vessels managed-in | Vessel 2          
Net book value $ 131,237,000 125,629,000 123,201,000      
Africa and Europe            
Nature Of Operations And Accounting Policies [Line Items]            
Number of vessels | Vessel 19          
Number of vessels owned | Vessel 18          
Number of vessels leased-in | Vessel 1          
Net book value $ 193,273,000 149,234,000 194,512,000      
Middle East and Asia            
Nature Of Operations And Accounting Policies [Line Items]            
Number of vessels owned | Vessel 16          
Net book value $ 197,301,000 254,543,000 286,165,000      
Latin America            
Nature Of Operations And Accounting Policies [Line Items]            
Number of vessels owned | Vessel 9          
Net book value $ 135,094,000 $ 176,347,000 $ 117,457,000      
[1] On September 29, 2022, the Company sold its ownership in this joint venture to the majority shareholder. See details below.
[2] On September 29, 2022, the Company sold an AHTS in exchange for the remaining equity interests in SEACOR Marlin LLC that it did not already own and consolidated the net assets thereof. See details below.