75000 - Document - Document and Entity Information
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75010 - Statement - Condensed Consolidated Balance Sheets
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75020 - Statement - Condensed Consolidated Balance Sheets (Parenthetical)
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75030 - Statement - Unaudited Condensed Consolidated Statements of Income (Loss)
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75040 - Statement - Unaudited Condensed Consolidated Statements of Comprehensive Income (Loss)
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75050 - Statement - Unaudited Condensed Consolidated Statements of Comprehensive Income (Loss) (Parenthetical)
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75060 - Statement - Unaudited Condensed Consolidated Statements of Changes In Equity
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75070 - Statement - Unaudited Condensed Consolidated Statements of Cash Flows
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995455 - Disclosure - Basis of Presentation and Accounting Policies
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995465 - Disclosure - Equipment Acquisitions and Dispositions
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995475 - Disclosure - Investments, at Equity, and Advances to 50% or Less Owned Companies
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995485 - Disclosure - Long Term Debt
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995495 - Disclosure - Leases
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995505 - Disclosure - Income Taxes
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995515 - Disclosure - Derivative Instruments and Hedging Strategies
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995525 - Disclosure - Fair Value Measurements
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995535 - Disclosure - Stockholders' Equity
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995545 - Disclosure - Commitments and Contingencies
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995555 - Disclosure - Stock Based Compensation
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995565 - Disclosure - Segment Information
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995575 - Disclosure - Cost Reduction Measures
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995585 - Disclosure - Subsequent Events
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995595 - Disclosure - Basis of Presentation and Accounting Policies (Policies)
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995605 - Disclosure - Basis of Presentation and Accounting Policies (Tables)
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995615 - Disclosure - Investments, at Equity, and Advances to 50% or Less Owned Companies (Tables)
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995625 - Disclosure - Long-term Debt (Tables)
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995635 - Disclosure - Leases (Tables)
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995645 - Disclosure - Income Taxes (Tables)
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995655 - Disclosure - Derivative Instruments and Hedging Strategies (Tables)
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995665 - Disclosure - Fair Value Measurements (Tables)
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995675 - Disclosure - Stock Based Compensation (Tables)
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995685 - Disclosure - Segment Information (Tables)
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995695 - Disclosure - Basis of Presentation and Accounting Policies - Additional Information (Details)
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995705 - Disclosure - Basis of Presentation and Accounting Policies - Schedule of Deferred Revenues (Details)
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995715 - Disclosure - Equipment Acquisitions and Dispositions - Additional Information (Details)
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995725 - Disclosure - Investments, at Equity, and Advances to 50% or Less Owned Companies - Schedule of Equity Investments (Details)
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995735 - Disclosure - Long Term Debt - Schedule of Long-term Debt Obligations (Details)
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995745 - Disclosure - Long Term Debt - Additional Information (Details)
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995755 - Disclosure - Leases - Additional Information (Details)
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995765 - Disclosure - Leases - Summary of Future Minimum Payments For Leases (Details)
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995775 - Disclosure - Leases - Summary of Future Minimum Payments For Leases (Details) 2
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995785 - Disclosure - Leases - Summary of Components of Leases Expense (Details)
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995795 - Disclosure - Leases - Summary of Supplemental Cash Flow Information Related to Leases (Details)
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995805 - Disclosure - Leases - Summary of Other Information Related to Leases (Details)
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995815 - Disclosure - Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details)
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995825 - Disclosure - Derivative Instruments and Hedging Strategies - Schedule of Fair Value of Derivative Assets and Liabilities (Details)
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995835 - Disclosure - Derivative Instruments and Hedging Strategies - Additional Information (Details)
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995845 - Disclosure - Derivative Instruments and Hedging Strategies - Schedule of Gains on Derivative Instruments not Designated as Hedging Instruments (Details)
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995855 - Disclosure - Fair Value Measurements - Schedule of Fair Value of Assets and Liabilities Measured on Recurring Basis (Details)
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995865 - Disclosure - Fair Value Measurements - Schedule of Estimated Fair Values of Financial Assets and Liabilities (Details)
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995875 - Disclosure - Fair Value Measurements - Additional Information (Details)
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995885 - Disclosure - Stockholders' Equity - Additional Information (Details)
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995895 - Disclosure - Commitments and Contingencies - Additional Information (Details)
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995905 - Disclosure - Stock Based Compensation - Schedule of Equity Incentive Plan Transactions (Details)
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995915 - Disclosure - Stock Based Compensation - Schedule of Equity Incentive Plan Transactions (Details) (Parenthetical)
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995925 - Disclosure - Stock Based Compensation - Additional Information (Details)
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995935 - Disclosure - Segment Information - Schedule of Segment Reporting Information, by Segment (Details)
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995945 - Disclosure - Segment Information - Schedule of Segment Reporting Information, by Segment (Parenthetical) (Details)
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995955 - Disclosure - Segment Information - Additional Information (Details)
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995965 - Disclosure - Cost Reduction Measures - Additional Information (Details)
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Effective Income Tax Rate Reconciliation Executive Compensation
Effective Income Tax Rate Reconciliation Executive Compensation
162(m) - executive compensation
162(m) - Executive compensation
Proceeds from Sale of Property, Plant, and Equipment
Proceeds from disposition of property and equipment
Total Net Proceeds
Proceeds from sale
Finance Lease, Liability
Finance Leases
Entity Incorporation, State or Country Code
Entity Incorporation, State or Country Code
Finance Lease, Liability, to be Paid, Year Four
2030
Carrying value as of the balance sheet date of obligations incurred through that date and payable for capital, repair and maintenance expenditures. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).
Accrued Capital Repair And Maintenance Expenditures Current
Accrued capital, repair and maintenance expenditures
Long-Term Debt, Excluding Current Maturities
Long-term debt, less current portion
Long-term debt
Long-term debt, less current portion
Schedule of Long-Term Debt Instruments [Table Text Block]
Schedule of Long-term Debt Obligations
Plan Name [Axis]
Plan Name
Equity [Abstract]
Entity Current Reporting Status
Entity Current Reporting Status
Information pertaining to fuel, lubes and supplies.
Fuel Lubes And Supplies [Member]
Fuel, Lubes and Supplies
Two Thousand And Twenty Four SEACOR Marine Foreign Holdings Credit Facility [Member]
Two Thousand And Twenty Four SEACOR Marine Foreign Holdings Credit Facility.
2024 SMFH Credit Facility
Fair Value, Inputs, Level 2 [Member]
Fair Value, Inputs, Level 2
Directors or Section 16 Officers [Member]
Directors or Section 16 Officers.
Directors or Section 16 Officers
Commitments and Contingencies Disclosure [Text Block]
Commitments and Contingencies
Cash Flow Hedging [Member]
Cash Flow Hedging
Common Stock, Shares Authorized
Common stock, shares authorized (in shares)
Product and Service [Axis]
Product and Service
Fair Value by Liability Class [Domain]
Fair Value by Liability Class
Document Fiscal Period Focus
Document Fiscal Period Focus
Finance Lease, Liability, to be Paid
Total finance leases
Accounting Standards Update 2023-09
Accounting Standards Update 2023-09 [Member]
Entity Shell Company
Entity Shell Company
Member stands for platform supply vessels ("PSVs").
Platform Supply Vessels [Member]
Platform Supply Vessels
Cash and Cash Equivalent
Cash and cash equivalents
Cash and Cash Equivalents, at Carrying Value, Total
Information pertaining to insurance and loss reserves.
Insurance And Loss Reserves [Member]
Insurance and Loss Reserves
Common Stock, Shares, Issued
Balance (in shares)
Balance (in shares)
Common stock, shares issued (in shares)
Statement [Table]
Statement [Table]
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability
Right-of-use assets obtained for operating lease liabilities
Latin America [Member]
Latin America
Property and equipment historical cost.
Property And Equipment Historical Cost
Historical cost
Increase (Decrease) in Receivables
Accounts receivables
Increase (Decrease) in Receivables, Total
Statement [Line Items]
Statement [Line Items]
Treasury Stock, Value, Acquired, Cost Method
Treasury stock, value acquired cost method
Restricted stock vesting
Entity Filer Category
Entity Filer Category
Entity Filer Category
Liabilities and Equity
Total liabilities and equity
Long-Term Debt, Current Maturities
Current portion due within one year
Long-Term Debt, Current Maturities, Total
Current portion of long-term debt
Long-Lived Tangible Asset [Axis]
Long-Lived Tangible Asset
Severance Costs
Severance charges
Finance Lease, Liability, to be Paid, Year Three
2029
Fair Value, by Balance Sheet Grouping [Table Text Block]
Schedule of Estimated Fair Values of Financial Assets and Liabilities
Hedging Relationship [Axis]
Hedging Relationship
The Carlyle Group Inc [Member]
The Carlyle group Inc.
Carlyle Investors
Carlyle Investors
Derivative [Line Items]
Derivative [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent
Statutory rate
Statutory rate
Effective income tax rate reconciliation, at federal statutory income tax rate, percent
Effective Income Tax Rate Reconciliation, Percent
Effective income tax rate
Effective income tax rate reconciliation, percent
Effective income tax rate reconciliation, percent
Effective Tax Rate
Convertible Debt Securities
Convertible Debt Securities [Member]
4.25 % Senior Convertible Notes
Finance Lease, Liability, to be Paid, Remainder of Fiscal Year
Remainder of 2026
Investment Income, Interest
Interest income
Amount of income (loss) from continuing operations before income (loss) from equity method investments and income (loss) attributable to noncontrolling interest, but after tax of income (loss) from continuing operations.
Income Loss From Continuing Operations Before Equity Method Investments And Noncontrolling Interest After Tax
Loss Before Equity in Earnings of 50% or Less Owned Companies
Liftboats One [Member]
Liftboats one.
Liftboats 1
Geographical [Domain]
Geographical
Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block]
Restricted Cash
Other comprehensive (loss) income
Other Comprehensive Income (Loss), before Tax
Other comprehensive income
Other comprehensive income
Additional Paid in Capital, Common Stock
Additional paid-in capital
Seabulk Angola.
Seabulk Angola [Member]
Seabulk Angola
Information pertaining to bareboat charter.
Bareboat Charter [Member]
Bareboat Charter
Property, Plant and Equipment [Line Items]
Property Plant And Equipment [Line Items]
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge
Recognized gain (loss) on hedged item in fair value hedge
Non-related Party
Nonrelated Party [Member]
Granted (in shares)
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross
Granted, shares (in shares)
Investment, Name [Axis]
Investment, Name
Earnings Per Share, Basic
Basic
Earnings (loss) per share
Basic
Repayments of Long-Term Debt
Payments on long-term debt
Repayments of Long-Term Debt, Total
Repayments of long-term debt, total
Cash Paid
Other Comprehensive Income (Loss), before Tax [Abstract]
Other Comprehensive (Loss) Income:
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number
Outstanding as of the end of year (in shares)
Outstanding as of the beginning of year (in shares)
Schedule of supplemental cash flow information related to leases.
Schedule Of Supplemental Cash Flow Information Related To Leases Table [Text Block]
Summary of Supplemental Cash Flow Information Related to Leases
Liabilities, Current
Total current liabilities
Current liabilities
Hedging Designation [Domain]
Hedging Designation
Payments on long-term debt issuance costs
Payments of Debt Issuance Costs
Accounting Standards Update [Axis]
Accounting Standards Update
Consolidation Items [Domain]
Consolidation Items
Equity, Attributable to Parent [Abstract]
SEACOR Marine Holdings Inc. stockholders’ equity:
Entity Small Business
Entity Small Business
Hedging Designation [Axis]
Hedging Designation
Percentage of Common Stock Outstanding
Percentage of common stock outstanding.
Percentage of common stock outstanding
Percentage of common stock outstanding
Retained Earnings (Accumulated Deficit)
Accumulated deficit
Retained Earnings (Accumulated Deficit), Total
Cumulative effect on retained earnings, net of tax
Forfeited (in shares)
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures in Period
Forfeited (in shares)
Share-Based Payment Arrangement [Text Block]
Stock Based Compensation
Accrued Insurance, Current
Accrued insurance deductibles and premiums
Leases [Abstract]
Unearned revenue
Contract with Customer, Liability
Balance at end of period
Balance at beginning of period
Contract with Customer, Liability, Total
Contract with customer, liability
Lessee, Lease, Description [Line Items]
Lessee Lease Description [Line Items]
Amendment Flag
Amendment Flag
Amendment Flag
Product and Service
Product and Service [Domain]
Warrants to purchase common stock
Class of Warrant or Right, Number of Securities Called by Warrants or Rights
Warrants to purchase common stock
Finance Lease, Interest Expense
Interest on lease liabilities
Interest on finance lease liabilities
Earnings Per Share, Policy [Policy Text Block]
Earnings (Loss) Per Share
Fast support vessel.
Fast Support Vessel [Member]
Fast Support Vessel
Disposal Group, Including Discontinued Operation, Assets, Current
Assets held for sale
Disposal Group, Including Discontinued Operation, Assets, Current, Total
Current assets
Information pertaining to repairs and maintenance services.
Repairs And Maintenance [Member]
Repairs and Maintenance
Liabilities and Equity [Abstract]
LIABILITIES AND EQUITY
Entity Address, Postal Zip Code
Entity Address, Postal Zip Code
Offshore support vessels member.
Offshore Support Vessels [Member]
Offshore Support Vessels
Cash Provided by (Used in) Operating Activity, Including Discontinued Operation
Net cash used in operating activities
Common Stock [Member]
Common Stock [Member]
Common Stock
Hedging Relationship
Hedging Relationship [Domain]
Lessee, Operating Lease, Liability, to be Paid, Year Three
2029
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment
Accumulated depreciation
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Total
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Beginning Balance
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Ending Balance
Miscellaneous Vessel Equipment [Member]
Miscellaneous vessel equipment.
Miscellaneous Vessel Equipment
Amortization of Debt Discount (Premium)
Debt discount amortization
Foreign Exchange Option [Member]
Forward Currency Exchange, Option, and Future Contracts
Portion at Fair Value Measurement [Member]
Fair Value Disclosure Item Amounts [Default]
Portion at Fair Value Measurement [Member] [Default]
Entity Address, Address Line One
Entity Address, Address Line One
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false]
Change in accounting principle, accounting standards update, immaterial effect [true false]
Fair Value Hierarchy and NAV [Axis]
Fair Value Hierarchy and NAV
Earnings Per Share [Abstract]
Net Loss Per Share:
Income Tax, Policy [Policy Text Block]
Income Taxes
Supplemental Cash Flow Information [Abstract]
Supplemental disclosures:
Derivative Asset
Derivative Asset, Total
Derivative Asset
Operating Lease, Right-of-Use Asset
Right-of-use asset - operating leases
Finance Lease, Liability, Undiscounted Excess Amount
Interest component
Document Type
Document Type
Document Type
Gross Profit
Direct Vessel (Loss) Profit
Entity Central Index Key
Entity Central Index Key
Trade receivables, allowance for credit loss
Accounts Receivable, Allowance for Credit Loss, Current
Net Change in Cash, Restricted Cash and Cash Equivalents
Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation
Recognized Savings in Wages and Benefits Expenses
Recognized savings in wages and benefits expenses.
Recognized savings in wages and benefits expenses
Antidilutive securities excluded from computation of loss per share, amount
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount
Common Stock, Par or Stated Value Per Share
Common stock, par value (in dollars per share)
Accounting Standards Update [Domain]
Accounting Standards Update
Operating Costs and Expenses
Operating
Operating Costs and Expenses, Total
Direct Costs and Expenses
Jesus Llorca [Member]
Jesus Llorca [Member]
Jesus Llorca
Commitments and contingencies.
Commitments And Contingencies [Line Items]
Commitments And Contingencies [Line Items]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period
Exercise of options (in shares)
Exercised (in shares)
Exercised (in shares)
Debt Disclosure [Abstract]
Derivative [Table]
Derivative [Table]
Estimate of Fair Value Measurement [Member]
Estimate of Fair Value Measurement
Stock Issued During Period, Value, Restricted Stock Award, Gross
Restricted stock grants
Current Fiscal Year End Date
Current Fiscal Year End Date
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures
Investments, at equity, and advances to 50% or less owned companies
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures, Total
Document Quarterly Report
Document Quarterly Report
Other Cost and Expense, Operating
Other Costs and Expenses
Other Costs and Expenses
Receivables [Abstract]
Receivables:
Litigation Case [Domain]
Litigation Case
Vesting Of Performace Based Restricted Stock Units [Member]
Vesting of Performace Based Restricted Stock Units
vesting of performace based restricted stock units.
Fair Value, by Balance Sheet Grouping [Table]
Fair Value By Balance Sheet Grouping [Table]
Entity Address, State or Province
Entity Address, State or Province
Entity Address, State or Province
Basis of presentation and accounting policies.
Basis Of Presentation And Accounting Policies [Line Items]
Basis Of Presentation And Accounting Policies [Line Items]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number
Outstanding as of the end of year (in shares)
Outstanding as of the beginning of year (in shares)
Number of shares outstanding
Number of shares outstanding
Line of Credit Facility, Remaining Borrowing Capacity
Line of credit facility, remaining borrowing capacity
Investment, Name [Domain]
Investment, Name
Comprehensive Income (Loss), Net of Tax, Attributable to Parent
Comprehensive Loss
Maximum Borrowing Percentage Of Purchase Price
Maximum borrowing percentage of purchase price.
Maximum borrowing percentage of purchase price
Geographical [Axis]
Africa and Europe, Continuing Operations
Equity, Attributable to Noncontrolling Interest
Noncontrolling interests in subsidiaries
Stockholders' Equity Attributable to Noncontrolling Interest, Total
Stockholders' Equity Attributable to Noncontrolling Interest, Beginning Balance
Stockholders' Equity Attributable to Noncontrolling Interest, Ending Balance
Stock Issued During Period, Value, Stock Options Exercised
Exercise of options
Performance Shares [Member]
Performance Stock [Member]
Performance Stock
Hybrid battery power systems.
Hybrid battery power systems [Member]
Hybrid Battery Power Systems
Long-Term Debt, Fair Value
Long-term debt, including current portion
Property, Plant and Equipment [Abstract]
Property and Equipment:
Other Assets, Noncurrent
Other assets
Antidilutive Securities [Axis]
Antidilutive Securities
Debt Instrument, Unamortized Discount
Unamortized debt discount
Debt Instrument, Unamortized Discount, Total
Unamortized discount
Unamortized Debt Discount
Restricted stock vesting (in shares)
Treasury Stock Shares Held Upon Vesting Of Restricted Stock Awards
Treasury stock shares held upon vesting of restricted stock awards.
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income [Member]
AOCI Attributable to Parent
Derivative Liability
Derivative Liability
Derivative Liability, Total
Shares held in treasury (in shares)
Treasury Stock, Common, Shares
Shares held in treasury (in shares)
Shares held in treasury (in shares)
Share Award Plans
Effective income tax rate reconciliation share award plans.
Effective Income Tax Rate Reconciliation Share Award Plans
Share award plans
Minimum [Member]
Minimum
Minimum
Assets, Current [Abstract]
Current Assets:
Equity Method Investments [Table Text Block]
Equity Method Investments
Information pertaining to other offshore marine services joint ventures.
Other Offshore Marine Services Joint Ventures [Member]
Other Offshore Marine Services Joint Ventures
Schedule of other information related to leases.
Schedule Of Other Information Related To Leases Table [Text Block]
Summary of Other Information Related to Leases
Other Comprehensive Income (Loss), Tax
Other Comprehensive Income (Loss), Tax, Total
Income Tax Expense
Gain (Loss) on Sale of Assets and Asset Impairment Charges
Gains from equipment sales, retirements or impairments
Gains on Asset Dispositions and Impairments, Net
Gains on asset dispositions and impairments, net
Fair Value, Inputs, Level 3 [Member]
Fair Value, Inputs, Level 3
Stock Repurchased During Period, Value Warrants
Stock repurchased during period value warrants.
Repurchase of warrants
Repurchase of warrants
Segment Reporting [Abstract]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
Schedule of Fair Value of Assets and Liabilities Measured on Recurring Basis
Liabilities, Current [Abstract]
Current Liabilities:
The amount of assets, excluding corporate assets.
Assets Excluding Corporate Assets
Total Assets
Information pertaining to Middle East and Asia.
Middle East And Asia [Member]
Middle East and Asia
Liftboats 2
Liftboats Two [Member]
Liftboats two.
Shares, Outstanding
Balance (in shares)
Balance (in shares)
Accounts Receivable, after Allowance for Credit Loss, Current
Accounts Receivable, after Allowance for Credit Loss, Current, Total
Trade, net of allowance for credit loss of $4,195 and $4,135 as of March 31, 2026 and December 31, 2025, respectively
Restricted Cash and Cash Equivalent
Restricted cash
Restricted Cash and Cash Equivalents, Total
Accounts Receivable, Credit Loss Expense (Reversal)
Allowance for credit losses
Operating Lease, Liability
Total operating leases
Operating Lease, Liability
Unrecorded unconditional purchase obligation, Minimum quantity
Unrecorded Unconditional Purchase Obligation, Minimum Quantity Required
Gain (Loss) on Derivative Instruments, Net, Pretax
Derivative gains
Derivative gains, net
Gain (Loss) on Derivative Instruments, Net, Pretax, Total
Debt Issuance Costs, Noncurrent, Net
Deferred financing costs
Debt Issuance Costs, Noncurrent, Net, Total
Platform Supply Vessel One [Member]
Platform supply vessel one .
PSV 1
Finance lease liability payments due after year four.
Finance Lease Liability Payments Due After Year Four
Years subsequent to 2030
Current portion of finance lease liabilities
Finance Lease, Liability, Current
Lessee, Lease, Description [Table]
Lessee Lease Description [Table]
Finance Lease, Weighted Average Discount Rate, Percent
Weighted average discount rate - finance leases
Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Including Discontinued Operation
Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations, Total
Effects of Exchange Rate Changes on Cash, Restricted Cash and Cash Equivalents
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest
Net income (loss)
Net Loss
Net Loss
Gregory Rossmiller
Gregory Rossmiller [Member]
Gregory Rossmiller [Member]
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss), before Reclassification and Tax
Foreign currency translation (losses) gains
Weighted Average Number of Shares Outstanding, Basic
Basic
Weighted Average Number of Shares Outstanding, Basic, Total
Cost allocation percentage.
Cost Allocation Percentage
Cost allocation percentage
Unrecorded Unconditional Purchase Obligation, to be Paid, Year One
Unrecorded unconditional purchase obligation payable during 2026
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
Schedule of Effective Income Tax Rate Reconciliation
Minimum Decrease in Annualized Wages and Benefits Expenses
Minimum decrease in annualized wages and benefits expenses.
Minimum decrease in annualized wages and benefits expenses
Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table]
Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table]
Long-Lived Tangible Asset [Domain]
Long-Lived Tangible Asset
Unrecorded Unconditional Purchase Obligation, to be Paid, Remainder of Fiscal Year
Unrecorded unconditional purchase obligation, due in remainder of fiscal year
Unrecorded unconditional purchase obligation payable during remainder of 2025
Subsequent Events [Text Block]
Subsequent Events
Represents wholly owned subsidiary Seabulk Overseas.
Seabulk Overseas [Member]
Seabulk Overseas
Information pertaining to time charter.
Time Charter [Member]
Time Charter
APIC, Share-Based Payment Arrangement, Increase for Cost Recognition
Amortization of share awards
APIC, Share-Based Payment Arrangement, Increase for Cost Recognition, Total
Equity, Attributable to Parent
Total stockholders equity
Stockholders' Equity Attributable to Parent, Beginning Balance
Stockholders' Equity Attributable to Parent, Ending Balance
Derivatives Not Designated as Hedging Instruments [Table Text Block]
Schedule of Gains on Derivative Instruments not Designated as Hedging Instruments
Effective Income Tax Rate Reconciliation, Accrual to Return True-up, Percent
Effective Income Tax Rate Reconciliation, Accrual to Return True-up, Percent
Accrual to return true-up
Statement of Stockholders' Equity [Abstract]
Equity Method Investments
Investments at equity
Equity method investments
Equity Investment
Use of Estimates, Policy [Policy Text Block]
Use of Estimates
Trade and Other Receivables and Allowance for Credit Losses
Credit Loss, Financial Instrument [Policy Text Block]
Recognition of new right-of-use asset - operating leases.
Recognition Of New Right Of Use Asset Operating Leases
Recognition of a new right-of-use asset - operating leases
Treasury Stock [Member]
Treasury Stock, Common [Member]
Foreign currency (losses) gains, net
Currency gains
Foreign Currency Transaction Gain (Loss), before Tax, Total
Foreign currency gains (losses), net
Currency (gains) losses
Entity Address, Address Line Two
Entity Address, Address Line Two
Entity Address, Address Line Two
Fair Value Disclosures [Text Block]
Fair Value Measurements
Information pertaining to other direct costs and expenses.
Other Direct Costs And Expenses [Member]
Other Direct Costs and Expenses
Vesting Of Restricted Share Awards [Member]
Vesting of restricted share awards.
Vesting of Restricted Share Awards
UNITED STATES
UNITED STATES
Noncontrolling Interest [Member]
Non-Controlling Interests In Subsidiaries [Member]
50% or Less Owned Companies
Debt Instrument, Name [Domain]
Debt Instrument, Name
Noncash Investing and Financing Items [Abstract]
Noncash Investing and Financing Activities:
Equity earnings
Equity in Earnings of 50% or Less Owned Companies
Equity in earnings of 50% or less owned companies
Income (loss) from equity method investments
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Plan Name [Domain]
Plan Name
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Class Of Warrant Or Right Exercise Price Per Warrant
Class of warrant or right, exercise price per warrant.
Exercise price per warrant
Exercise price per warrant
Entity [Domain]
Entity
Credit Facility
Credit Facility [Axis]
Equity Method Investment, Ownership Percentage
Equity method investment, ownership percentage
Ownership percentage
Schedule of Investments [Line Items]
Schedule Of Investments [Line Items]
Impairment, Long-Lived Asset, Held-for-Use
Impairment of long-lived assets owned or leased in vessels
Impairment, Long-Lived Asset, Held-for-Use, Total
Impairment of long-lived assets owned or leased in vessels
Finance Lease, Liability, to be Paid, Year One
2027
Treasury Stock, Value
Treasury Stock, Value, Total
Shares held in treasury of 1,325,643 and 1,097,456 as of March 31, 2026 and December 31, 2025, respectively, at cost
Shares held in treasury of 248,638 and 127,887 in 2022 and 2021, respectively, at cost
Lessee, Operating Lease, Liability, to be Paid, Fiscal Year Maturity [Abstract]
Operating Leases
Related and Nonrelated Parties [Axis]
Related Party
Property, Plant and Equipment, Policy [Policy Text Block]
Property and Equipment
Entity Address, City or Town
Entity Address, City or Town
Stock Repurchased During Period, Shares
Stock repurchase, shares
Repurchase of Common Stock (in shares)
Repurchase of Common Stock (in shares)
Security Exchange Name
Security Exchange Name
Commitments and contingencies.
Commitments And Contingencies [Table]
Commitments And Contingencies [Table]
Credit Facility [Domain]
Credit Facility
Long-Term Debt, Gross
Long-term Debt, Gross
2024 SMFH Credit Facility
Long-term Debt, Gross
Counterparty Name [Axis]
Counterparty Name
Lessee operating and finance lease liability maturity.
Lessee Operating And Finance Lease Liability Maturity Table [Text Block]
Summary of Future Minimum Payments for Leases
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number
Number of shares likely to vest
Rule10b51Arr Stock Issuable Upon Exercise Of Option
Rule10b51Arr Stock Issuable Upon Exercise Of Option [Member]
Rule10b51ArrStockIssuableUponExerciseOfOptionMember
Direct Operating Expenses, Policy [Policy Text Block]
Direct operating expenses, policy.
Direct Operating Expenses
Cost Reduction Measures [Abstract]
Cost reduction measures.
Impairment or Disposal of Long-Lived Assets, Including Intangible Assets, Policy [Policy Text Block]
Impairment of Long-Lived Assets and Impairment of 50% or Less Owned Companies
Antidilutive Securities, Name [Domain]
Antidilutive Securities, Name
John Gellert
John Gellert [Member]
John Gellert [Member]
Foreign taxes, including withholding taxes
Foreign taxes
Income (loss) of foreign subsidiaries not includable in U.S. return
Income (loss) of foreign subsidiaries not includable in U.S. return and foreign withholding tax
Derivative gains (loss) on cash flow hedges
Derivative gains on cash flow hedges
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax
Inventory, Net
Inventories
Inventory, Net, Total
Cash paid for interest, excluding capitalized interest
Interest Paid, Excluding Capitalized Interest, Operating Activity
Cash paid for interest, excluding capitalized interest
Measurement Basis [Axis]
Measurement Basis
Statistical Measurement [Domain]
Statistical Measurement
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net
Gains on derivative instruments
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net, Total
Gains (losses) on derivative instruments
Class of Warrant or Right, Exercise Price of Warrants or Rights
Class of warrant or right, exercise price of warrants or rights
Exercise price of warrant per share
Assets, Current
Total current assets
Current assets
Document Period End Date
Document Period End Date
Title and Position [Axis]
Title of Individual
Fair Value Hierarchy and NAV [Domain]
Fair Value Hierarchy and NAV
Gain (Loss) on Disposition of Property Plant Equipment
Gain (loss) on disposition of property, plant and equipment
Gain on disposition of property, plant and equipment
Gain on Sale of Windcat Workboats
Long-Term Debt [Text Block]
Long Term Debt
Statement of Financial Position [Abstract]
Revenue [Policy Text Block]
Revenue Recognition
Tranche Two [Member]
Tranche two.
Tranche Two
Tranche Two
Finance Lease, Liability, to be Paid, Fiscal Year Maturity [Abstract]
Finance Leases
Not Designated as Hedging Instrument [Member]
Not Designated as Hedging Instrument
Liabilities
Total liabilities
Number of vessels acquired
Acquired
Number Of Equipment Acquired
Represents the number of of equipment acquired.
Number of equipment deliveries
Segment information.
Segment Information [Line Items]
Segment Information [Line Items]
Loss Contingency, Estimate of Possible Loss
Potential range of levies
Derivative Liability, Statement of Financial Position [Extensible Enumeration]
Lessee operating lease liability payment due after year four.
Lessee Operating Lease Liability Payment Due After Year Four
Years subsequent to 2030
Lessee, Operating Lease, Liability, to be Paid, Year Two
2028
Restricted Stock [Member]
Restricted Stock
Foreign Exchange Forward [Member]
Forward Exchange Contract
Finance Lease, Right-of-Use Asset, Amortization
Amortization of finance lease assets
Deferred Revenue, Additions
Unearned revenues during the period
Weighted Average Number of Shares Outstanding, Diluted
Diluted
Weighted Average Number of Shares Outstanding, Diluted, Total
Diluted earnings per share
Securities Act File Number
Entity File Number
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Percent
Other
Accounting Standards Update 2023-07
Accounting Standards Update 2023-07 [Member]
Basis of Accounting [Text Block]
Basis of Presentation and Accounting Policies
Cover [Abstract]
Increase (Decrease) in Accounts Payable and Accrued Liabilities
Accounts payable and accrued liabilities
Increase (Decrease) in Accounts Payable and Accrued Liabilities, Total
Prepaid Expense and Other Assets, Current
Prepaid expenses and other
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period
Forfeited (in shares)
Forfeited (in shares)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest
Loss Before Income Tax (Benefit) Expense and Equity in Earnings of 50% or Less Owned Companies
Loss Before Income Tax Expense and Equity in Earnings of 50% or Less Owned Companies
Loss from Continuing Operations Before Income Tax (Benefit) Expense and Equity in Earnings of 50% or Less Owned Companies
Subpart F Income and GILTI
Effective Income Tax Rate Reconciliation Subpart F Income And Global Intangible Low Taxed Income
Effective income tax rate reconciliation subpart f income and global intangible low taxed income.
Subpart F Income and GILTI
Segment Reporting Disclosure [Text Block]
Segment Information
General and Administrative Expense
Administrative and general
General and Administrative Expense, Total
Information pertaining to liftboats.
Liftboats [Member]
Liftboats
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]
Corporate, Non-Segment
Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Noncash Item [Abstract]
Adjustments to reconcile net loss to net cash used in operating activities:
Revenue from Contract with Customer, Including Assessed Tax
Operating Revenues
Revenues
Leases Disclosure [Text Block]
Leases disclosure.
Leases
Outstanding derivative instruments
Derivative Assets (Liabilities), at Fair Value, Net
Derivative Assets (Liabilities), at Fair Value, Net, Total
Equity investments in 50% or less owned companies.
Equity Investments in 50 or Less Owned Companies [Member]
Equity Investments in 50% or Less Owned Companies
Property, Plant and Equipment, Useful Life
Estimated useful life (Year)
Schedule of Investments [Table]
Schedule Of Investments [Table]
New Accounting Pronouncements, Policy [Policy Text Block]
Recently Issued Accounting Standards
Contract with Customer, Liability, Current
Unearned revenue
Reported Value Measurement [Member]
Reported Value Measurement
Other Receivables Net Current
Other
Other Receivables, Net, Current, Total
Platform Supply Vessel [Member]
Platform supply vessel.
Platform Supply Vessel
Lessee, Operating Lease, Term of Contract
Operating lease, lease terms (in duration)
Operating Lease, Liability, Current
Current portion of operating lease liabilities
Depreciation, Depletion and Amortization
Depreciation and amortization
Depreciation, Depletion and Amortization, Total
Document Transition Report
Document Transition Report
Asset Impairment Charges
Impairment charges
Asset Impairment Charges, Total
Payments for Repurchase of Common Stock
Stock repurchase, value
Payments for repurchase of common stock
Payments for repurchase of common stock
Schedule of Investments [Abstract]
Statement of Cash Flows [Abstract]
Information pertaining to drydocking services.
Drydocking [Member]
Drydocking
Derivative Asset, Statement of Financial Position [Extensible Enumeration]
Interest Rate Swap [Member]
Interest Rate Swap
Equity [Text Block]
Stockholders' Equity
Cost Reduction Measures [Text Block]
Cost reduction measures.
Cost Reduction Measures
Amount after accumulated depreciation, depletion and amortization of physical assets, excluding construction in progress, used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.
Property Plant And Equipment Excluding Construction In Progress
Property and equipment
Net book value
Net book value
Operating lease costs
Operating Lease, Cost
Operating Lease, Payments
Operating cash outflows from operating leases
Operating cash flows from operating leases
Operating cash flows from operating leases
Assets [Abstract]
ASSETS
Amount of lease expense not specifice to general day to day operations.
Lease Expense
Lease expense
Increase (Decrease) in Prepaid Expense and Other Assets
Other assets
Restructuring and Related Activities [Abstract]
Fast support vessels member.
Fast Support Vessels [Member]
Fast Support Vessels
Document Fiscal Year Focus
Document Fiscal Year Focus
Capitalized Interest Costs, Including Allowance for Funds Used During Construction
Capitalized interest costs, including allowance for funds used during construction, total
Capitalized Interest Costs, Including Allowance for Funds Used During Construction, Total
Disclosure of accounting policy pertaining to recently adopted accounting standards.
Recently Adopted Accounting Standards Policy [Text Block]
Recently Adopted Accounting Standards
Basis of presentation and accounting policies.
Basis Of Presentation And Accounting Policies [Table]
Basis Of Presentation And Accounting Policies [Table]
Cash Flows from Investing Activities:
Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract]
Accounts Payable, Current, Total
Accounts Payable, Current
Accounts payable
Interest Expense, Nonoperating, Total
Interest Expense, Nonoperating
Interest expense
Interest expense
Reclassification of derivative gains on cash flow hedges to equity in earnings
Percentage of owned companies derivative losses on cash flow hedges reclassification to equity in earnings.
Percentage Of Owned Companies Derivative Losses On Cash Flow Hedges Reclassification To Equity In Earnings
Proceeds from Sale of Productive Assets
Proceeds from Sale of Productive Assets, Total
Proceeds from sale of productive assets
Basis of presentation and accounting policies.
Basis Of Presentation And Accounting Policies [Abstract]
Fair Value Disclosures [Abstract]
Commitments and Contingencies Disclosure [Abstract]
Lessee, Operating Lease, Liability, to be Paid, Year One
2027
Impairment, Long-Lived Asset, Held-for-Use, Statement of Income or Comprehensive Income [Extensible Enumeration]
Impairment, Long-Lived Asset, Held-for-Use, Statement of Income or Comprehensive Income [Extensible Enumeration]
Long-Term Line of Credit
Long-Term Line of Credit, Total
Line of credit
Line of credit facility, outstanding amount
Seacor Marine Arabia.
Seacor Marine Arabia [Member]
SEACOR Marine Arabia
Debt Instrument [Axis]
Debt Instrument
Derivative Instrument
Derivative Instrument [Axis]
Share-Based Payment Arrangement [Abstract]
Finance lease costs:
Finance lease costs.
Finance Lease Costs [Abstract]
Equity Method Investments and Joint Ventures Disclosure [Text Block]
Investments, at Equity, and Advances to 50% or Less Owned Companies
Cash Provided by (Used in) Investing Activity, Including Discontinued Operation
Net cash provided by (used in) investing activities
Finance Lease, Weighted Average Remaining Lease Term
Weighted average remaining lease term, in years - finance leases
Title of 12(b) Security
Title of 12(b) Security
Schedule of Segment Reporting Information, by Segment [Table]
Schedule Of Segment Reporting Information By Segment [Table]
Derivative Instruments and Hedging Activities Disclosure [Text Block]
Derivative Instruments and Hedging Strategies
Related and Nonrelated Parties [Domain]
Related Party
Income Tax Disclosure [Text Block]
Income Taxes
Interest Expense [Member]
Interest Expense
Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year
Remainder of 2026
Other Liabilities, Noncurrent
Deferred gains and other liabilities
Finance Lease, Right-of-Use Asset, after Accumulated Amortization
Right-of-use asset - finance leases
Finance Lease, Right-of-Use Asset, after Accumulated Amortization, Total
Legal Entity [Axis]
Legal Entity
Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract]
Changes in Operating Assets and Liabilities:
Letters of Credit Outstanding, Amount
Letters of credit outstanding, amount
Income Tax Disclosure [Abstract]
Fair Value, Recurring and Nonrecurring [Table]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Table]
Additional Paid-in Capital [Member]
Additional Paid-In Capital [Member]
Director share awards
Stock Issued During Period, Value, Issued for Services
Measurement Frequency [Domain]
Measurement Frequency
Trading Symbol
Trading Symbol
Trading Symbol
Property, Plant and Equipment Disclosure [Text Block]
Equipment Acquisitions and Dispositions
Recognition of new right-of-use asset - financing leases.
Recognition Of New Right Of Use Asset Financing Leases
Recognition of a new right-of-use asset - financing leases
Director [Member]
Director [Member]
Director
Employee-related Liabilities, Current
Accrued wages and benefits
Employee-related Liabilities, Current, Total
Embedded Derivative Financial Instruments [Member]
Embedded Derivative Financial Instruments
Cash Flows from Financing Activities:
Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract]
Financing lease, lease terms (in duration)
Lessee, Finance Lease, Term of Contract
Fair Value, Recurring [Member]
Fair Value, Measurements, Recurring Basis
Deficiency notice.
Deficiency Notice [Member]
Deficiency Notice
Entity Ex Transition Period
Entity Ex Transition Period
Lessee, Operating Lease, Liability, to be Paid
Operating lease payments due
Lessee, Operating Lease, Liability, Undiscounted Excess Amount
Interest component
Equity Components [Axis]
Equity Components
Nonoperating Income (Expense)
Nonoperating income (expense)
Equity Component [Domain]
Equity Component
Share-Based Payment Arrangement, Activity [Table Text Block]
Schedule of Equity Incentive Plan Transactions
Statement of Comprehensive Income [Abstract]
Equity Method Investment, Other-than-Temporary Impairment
Equity method investment, other than temporary impairment
Maximum [Member]
Maximum
Designated as Hedging Instrument [Member]
Designated as Hedging Instrument
Statistical Measurement [Axis]
Statistical Measurement
Member stands for other equipment.
Other Equipment [Member]
Other Equipment
Common Stock, Value, Issued
Common stock, $.01 par value, 60,000,000 shares authorized; 28,387,920 and 28,049,242 shares issued as of March 31, 2026 and December 31, 2025, respectively
Common stock value
Finance Lease, Principal Payments
Financing cash outflows from finance leases
Payments on finance leases
Financing cash outflows from finance leases
Payments on finance leases
Segment information.
Segment Information [Table]
Segment Information [Table]
Consolidation, Policy [Policy Text Block]
Basis of Consolidation
Equity, Including Portion Attributable to Noncontrolling Interest
Balance
Balance
Total equity
Cumulative Effect of New Accounting Principle in Period of Adoption
Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block]
Assets Held for Sale
Amortization of Debt Issuance Costs
Deferred financing costs amortization
Costs and Expenses
Costs and expenses
Proceeds from interest on finance leases.
Proceeds From Interest On Finance Leases
Interest on finance leases
Tax withholdings on restricted stock vesting and director share awards
Payment, Tax Withholding, Share-Based Payment Arrangement
Tax withholdings on restricted stock vesting and director share awards
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative Financial Instruments, Liabilities [Member]
Derivative Liabilities
Entity Registrant Name
Entity Registrant Name
Entity Registrant Name
Treasury Stock, Shares, Acquired
Restricted stock vesting (in shares)
Director restricted stock vesting (in shares)
Restricted stock vesting (in shares)
Treasury stock, shares acquired
Other Nonoperating Income (Expense), Total
Other Nonoperating Income (Expense)
Other, net
Other, net
Subsequent Events [Abstract]
Africa and Europe.
Africa And Europe [Member]
Africa and Europe, Continuing Operations
Africa and Europe
Income Tax (Benefit) Expense
Income Tax Benefit
Income Tax Expense (Benefit)
Income Tax Expense
Measurement Frequency [Axis]
Measurement Frequency
Payments to Acquire Productive Assets
Payments to Acquire Productive Assets, Total
Payments to acquire productive assets
Stock Repurchased During Period, Value
Repurchase of Common Stock
Repurchase of Common Stock
Repurchase of Common Stock
Costs and Expenses [Abstract]
Costs and Expenses:
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Entity Common Stock, Shares Outstanding
Entity Common Stock, Shares Outstanding
Entity Common Stock, Shares Outstanding
Liability Class [Axis]
Liability Class
Revenues recognized during the period
Deferred Revenue, Revenue Recognized
Accumulated Other Comprehensive Income (Loss), Net of Tax
Accumulated other comprehensive income, net of tax
Accumulated Other Comprehensive Income (Loss), Net of Tax, Total
Consolidation Items [Axis]
Consolidation Items
Payments to Acquire Property, Plant, and Equipment
Purchases of property and equipment
Payments to Acquire Property, Plant, and Equipment, Total
Granted (in shares)
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period
Number of shares issued
Assets
Total assets
Assets, Total
Property, Plant and Equipment [Table]
Schedule Of Property Plant And Equipment [Table]
Other marine services.
Other Marine Services [Member]
Other Marine Services
Income Statement [Abstract]
Deferred Income Tax Expense (Benefit)
Deferred income taxes
Deferred Income Tax Expense (Benefit), Total
Deferred
Increase (Decrease) in capital expenditures in accounts payable and accrued liabilities.
Increase Decrease In Capital Expenditures In Accounts Payable And Accrued Liabilities
Increase (decrease) in capital expenditures in accounts payable and accrued liabilities
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate, Percent
Effective income tax rate reconciliation, foreign income tax rate, percent
Foreign taxes
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period
Vested (in shares)
Number of shares vested
Vested, shares (in shares)
Number of shares vested
Earnings Per Share, Diluted
Diluted
Diluted earnings per share
Schedule of Segment Reporting Information, by Segment [Table Text Block]
Schedule of Segment Reporting Information, by Segment
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Title and Position [Domain]
Title of Individual
City Area Code
City Area Code
City Area Code
Other comprehensive (loss) income, net
Other Comprehensive Income (Loss), Net of Tax
Other comprehensive income (loss)
Long-term finance lease liabilities
Long-term finance lease liabilities
Finance Lease, Liability, Noncurrent
Line of Credit Facility, Maximum Borrowing Capacity
Line of credit facility, maximum borrowing capacity
Fair Value Hedging [Member]
Fair Value Hedging
Counterparty Name [Domain]
Counterparty Name
Litigation Case [Axis]
Litigation Case
Operating Lease, Weighted Average Remaining Lease Term
Weighted average remaining lease term, in years - operating leases
New Convertible Notes.
New Convertible Notes [Member]
New Convertible Notes
Segment Reporting Information [Line Items]
Segment Reporting Information [Line Items]
Stock Issued During Period, Shares, Restricted Stock Award, Gross
Restricted stock grants (in shares)
Total lease expense
Lease, Cost
Cash and Cash Equivalents
Cash and Cash Equivalents, Policy [Policy Text Block]
Property, Plant and Equipment, Net
Net property and equipment
Net book value
Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Including Discontinued Operation
Cash, Restricted Cash and Cash Equivalents, End of Period
Cash, Restricted Cash and Cash Equivalents, Beginning of Period
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations, Total
Operating Income (Loss)
Operating income (loss)
Operating Loss
Retained Earnings [Member]
Accumulated Deficit [Member]
Retained Earnings [Member]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax
Reclassification of derivative gains on cash flow hedges to interest expense
Reclassification of derivative (gains) losses on cash flow hedges to interest expense
Unrecorded Unconditional Purchase Obligation, Maximum Quantity
Unrecorded unconditional purchase obligation, maximum quantity
Share-Based Payment Arrangement, Noncash Expense
Stock-based compensation expense
Share-Based Payment Arrangement, Noncash Expense, Total
Information pertaining to personnel services.
Personnel [Member]
Personnel
Unrecorded Unconditional Purchase Obligation
Unrecorded unconditional purchase obligation, total
Unrecorded Unconditional Purchase Obligation, Total
Operating Lease, Weighted Average Discount Rate, Percent
Weighted average discount rate - operating leases
Long-term operating lease liabilities
Operating Lease, Liability, Noncurrent
Long-term operating lease liabilities
Fair Value, Inputs, Level 1 [Member]
Fair Value, Inputs, Level 1
Class of Stock [Line Items]
Class Of Stock [Line Items]
Net cash used in financing activities
Cash Provided by (Used in) Financing Activity, Including Discontinued Operation
Lease, Cost [Table Text Block]
Summary of Components of Leases Expense
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]
Change in accounting principle, accounting standards update, adopted [true false]
Deferred Income Tax Liabilities, Net
Deferred income taxes
Settlement on derivative transactions, net
The net amount of cash paid for or received to settle derivatives during the period not designated as hedges.
Payments For Proceeds From Derivative Instruments Operating Activities
SEACOR Marine Foreign Holdings.
S E A C O R Marine Foreign Holdings [Member]
SEACOR Marine Foreign Holdings
Other Income (Expense):
Nonoperating Income (Expense) [Abstract]
Derivative Contract [Domain]
Derivative Contract
The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets, including fair value hedges.
Payments To Acquire Property Plant And Equipment Including Fair Value Hedges
Payments to acquire property, plant, and equipment, including fair value hedges
Andrew H Everett II [Member]
AndrewHEverettII
Andrew H. Everett II
Rule 10b51 Arr Potential Sale of Shares [Member]
Rule10b51ArrPotentialSaleofSharesMember
Rule 10b51 Arr Potential Sale of Shares
Entity Interactive Data Current
Entity Interactive Data Current
Fair Value Measurement [Domain]
Fair Value Measurement
Cash Flows from Operating Activities:
Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract]
Stock Issued During Period, Shares, Issued for Services
Director share awards (in shares)
Entity Tax Identification Number
Entity Tax Identification Number
Equity:
Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]
Share price
Share Price
Share price
Construction in Progress, Gross
Construction in progress
Local Phone Number
Local Phone Number
Other Liabilities, Current
Other current liabilities
Short-Term Lease, Cost
Short-term lease costs
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Weighted Average Common Stock and Warrants Outstanding:
Information pertaining to anchor handling towing supply.
Anchor Handling Towing Supply Vessel [Member]
Anchor Handling Towing Supply Vessel
Anchor Handling Towing Supply
Finance Lease, Liability, to be Paid, Year Two
2028
Anchor Handling Towing Supply Vessel and Other Equipment
Anchor Handling Towing Supply Vessel and Other Equipment [Member]
Anchor Handling Towing Supply Vessel and Other Equipment.
Represents the number of equipment sold.
Number Of Equipment Sold
Number of equipment sold
Accounting Policies [Abstract]
Deferred Revenue, by Arrangement, Disclosure [Table Text Block]
Schedule of Deferred Revenues
Interest and Dividends Payable, Current
Accrued interest
Interest and Dividends Payable, Current, Total
Lessee, Operating Lease, Liability, to be Paid, Year Four
2030
SEACOR Holdings
Affiliated Entity [Member]
Stock, Class of Stock [Table]
Schedule Of Stock By Class [Table]
Liftboats And Other Equipment [Member]
Liftboats and other equipment.
Liftboats and Other Equipment
Entity Emerging Growth Company
Entity Emerging Growth Company