Entity Central Index Key
Equity method investment summarized financial information fair value of debt acquired.
Equity method investment acquisition costs.
The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period and reversal of a prior year accrual.
Cover [Abstract]
Document Type
Document Type
Amendment Flag
Amendment Flag
Document Period End Date
Document Period End Date
Document Fiscal Year Focus
Document Fiscal Year Focus
Document Fiscal Period Focus
Document Fiscal Period Focus
Trading Symbol
Trading Symbol
Entity Registrant Name
Entity Registrant Name
Entity Central Index Key
Current Fiscal Year End Date
Current Fiscal Year End Date
Entity Filer Category
Entity Filer Category
Entity Small Business
Entity Small Business
Entity Emerging Growth Company
Entity Emerging Growth Company
Entity Ex Transition Period
Entity Ex Transition Period
Entity Common Stock, Shares Outstanding
Entity Common Stock Shares Outstanding
Entity Current Reporting Status
Entity Current Reporting Status
Entity Shell Company
Entity Shell Company
Entity File Number
Entity File Number
Entity Tax Identification Number
Entity Tax Identification Number
Entity Address, Address Line One
Entity Address Address Line1
Entity Address, Address Line Two
Entity Address Address Line2
Entity Address, City or Town
Entity Address City Or Town
Entity Address, State or Province
Entity Address State Or Province
Entity Address, Postal Zip Code
Entity Address Postal Zip Code
City Area Code
City Area Code
Local Phone Number
Local Phone Number
Entity Incorporation, State or Country Code
Entity Incorporation State Country Code
Entity Interactive Data Current
Entity Interactive Data Current
Title of 12(b) Security
Security12b Title
Security Exchange Name
Security Exchange Name
Document Quarterly Report
Document Quarterly Report
Document Transition Report
Document Transition Report
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.
Amount of construction reserve funds as of the balance sheet date.
Recourse long term debt current.
Non-recourse long term debt current.
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).
Recourse long term debt noncurrent.
Non-recourse long term debt noncurrent.
Statement Of Financial Position [Abstract]
ASSETS
Assets [Abstract]
Current Assets:
Assets Current [Abstract]
Cash and cash equivalents
Cash And Cash Equivalents At Carrying Value
Restricted cash
Restricted Cash And Cash Equivalents
Receivables:
Receivables [Abstract]
Trade, net of allowance for credit loss accounts of $664 and $455 in 2020 and 2019, respectively
Accounts Receivable Net Current
Other
Other Receivables Net Current
Receivable from SEACOR Holdings
Due From Affiliate Current
Inventories
Inventory Net
Prepaid expenses and other
Prepaid Expense And Other Assets Current
Total current assets
Assets Current
Property and Equipment:
Property Plant And Equipment [Abstract]
Historical cost
Property Plant And Equipment Gross
Accumulated depreciation
Accumulated Depreciation Depletion And Amortization Property Plant And Equipment
Property and equipment
Property Plant And Equipment Excluding Construction In Progress
Construction in progress
Construction In Progress Gross
Net property and equipment
Property Plant And Equipment Net
Right-of-Use Asset - Operating Leases
Operating Lease Right Of Use Asset
Investments, at Equity, and Advances to 50% or Less Owned Companies
Investments In Affiliates Subsidiaries Associates And Joint Ventures
Construction Reserve Funds
Construction Reserve Funds
Other Assets
Other Assets Noncurrent
Total assets
Assets
LIABILITIES AND EQUITY
Liabilities And Stockholders Equity [Abstract]
Current Liabilities:
Liabilities Current [Abstract]
Current portion of operating lease liabilities
Operating Lease Liability Current
Current portion of long-term debt:
Long Term Debt Current [Abstract]
Recourse
Recourse Long Term Debt Current
Non-recourse
Non Recourse Long Term Debt Current
Accounts payable and accrued expenses
Accounts Payable And Accrued Liabilities Current
Due to SEACOR Holdings
Due To Affiliate Current
Accrued wages and benefits
Employee Related Liabilities Current
Accrued interest
Interest And Dividends Payable Current
Deferred revenue and unearned revenue
Contract With Customer Liability Current
Accrued capital, repair and maintenance expenditures
Accrued Capital Repair And Maintenance Expenditures Current
Accrued insurance deductibles and premiums
Accrued Insurance Current
Derivatives
Derivative Liabilities Current
Other current liabilities
Other Liabilities Current
Total current liabilities
Liabilities Current
Long-Term Operating Lease Liabilities
Operating Lease Liability Noncurrent
Long-Term Debt:
Long Term Debt Noncurrent [Abstract]
Recourse
Recourse Long Term Debt Noncurrent
Non-recourse
Non Recourse Long Term Debt Noncurrent
Conversion Option Liability on Convertible Senior Notes
Derivative Liabilities Noncurrent
Deferred Income Taxes
Deferred Income Tax Liabilities Net
Deferred Gains and Other Liabilities
Other Liabilities Noncurrent
Total liabilities
Liabilities
Equity:
Stockholders Equity Including Portion Attributable To Noncontrolling Interest [Abstract]
SEACOR Marine Holdings Inc. stockholders’ equity:
Stockholders Equity [Abstract]
Common stock, $.01 par value, 60,000,000 shares authorized; 23,096,914 and 21,928,674 shares issued in 2020 and 2019, respectively
Common Stock Value
Additional paid-in capital
Additional Paid In Capital Common Stock
Retained earnings
Retained Earnings Accumulated Deficit
Shares held in treasury of 72,930 and 47,185, respectively, at cost
Treasury Stock Value
Accumulated other comprehensive gain (loss), net of tax
Accumulated Other Comprehensive Income Loss Net Of Tax
Total stockholders equity
Stockholders Equity
Noncontrolling interests in subsidiaries
Minority Interest
Total equity
Stockholders Equity Including Portion Attributable To Noncontrolling Interest
Total liabilities and equity
Liabilities And Stockholders Equity
Trade receivables, allowance for credit loss
Allowance For Doubtful Accounts Receivable Current
Common stock, par value (in dollars per share)
Common Stock Par Or Stated Value Per Share
Common stock, shares authorized (in shares)
Common Stock Shares Authorized
Common stock, shares issued (in shares)
Common Stock Shares Issued
Shares held in treasury (in shares)
Treasury Stock Shares
Amount of lease expense not specifice to general day to day operations.
Amount of guarantee fees attributable to a related party.
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 Statement [Abstract]
Operating Revenues
Revenue From Contract With Customer Including Assessed Tax
Costs and Expenses:
Costs And Expenses [Abstract]
Operating
Operating Costs And Expenses
Administrative and general
General And Administrative Expense
Lease expense
Lease Expense
Depreciation and amortization
Depreciation Depletion And Amortization
Costs and expenses
Costs And Expenses
Losses on Asset Dispositions and Impairments, Net
Gain Loss On Sales Of Assets And Asset Impairment Charges
Operating Loss
Operating Income Loss
Other Income (Expense):
Nonoperating Income Expense [Abstract]
Interest income
Investment Income Interest
Interest expense
Interest Expense
SEACOR Holdings guarantee fees
Guarantee Fees Related Party
Derivative gains (losses), net
Gain Loss On Derivative Instruments Net Pretax
Foreign currency losses, net
Foreign Currency Transaction Gain Loss Before Tax
Nonoperating income expense
Nonoperating Income Expense
Loss from Continuing Operations Before Income Tax Benefit and Equity in Earnings of 50% or Less Owned Companies
Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments
Income Tax Benefit
Income Tax Expense Benefit
Loss from Continuing Operations Before Equity in Earnings of 50% or Less Owned Companies
Income Loss From Continuing Operations Before Equity Method Investments And Noncontrolling Interest After Tax
Equity in Earnings gains (Losses) of 50% or Less Owned Companies
Income Loss From Equity Method Investments
Loss from Continuing Operations
Income Loss From Continuing Operations
Income on Discontinued Operations, Net of Tax (see Note 15)
Income Loss From Discontinued Operations Net Of Tax
Net Loss
Profit Loss
Net Income (Loss) attributable to Noncontrolling Interests in Subsidiaries
Net Income Loss Attributable To Noncontrolling Interest
Net Loss attributable to SEACOR Marine Holdings Inc.
Net Income Loss
Basic and Diluted Loss Per Common Share and Warrants of SEACOR Marine Holdings Inc.
Earnings Per Share Basic And Diluted [Abstract]
Continuing operations
Income Loss From Continuing Operations Per Basic And Diluted Share
Discontinued operations
Income Loss From Discontinued Operations Net Of Tax Per Basic And Diluted Share
Basic and Diluted Loss Per Common Share and Warrants
Earnings Per Share Basic And Diluted
Weighted Average Common Stock and Warrants Outstanding:
Weighted Average Number Of Shares Outstanding [Abstract]
Basic and diluted shares
Weighted Average Number Of Share Outstanding Basic And Diluted
Statement Of Income And Comprehensive Income [Abstract]
Statement [Table]
Statement [Table]
Income Statement Location
Income Statement Location [Axis]
Income Statement Location
Income Statement Location [Domain]
Interest Expense
Interest Expense [Member]
Primary financial statement caption encompassing equity method investments.
Equity Method Investments
Equity Method Investments1 [Member]
Statement [Line Items]
Statement [Line Items]
Net Loss
Other Comprehensive Loss:
Other Comprehensive Income Loss Before Tax Period Increase Decrease [Abstract]
Foreign currency translation gains (losses)
Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Before Reclassification And Tax
Derivative gains (losses) on cash flows hedges
Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Before Tax
Reclassification of derivative gains (losses) on cash flow hedges
Other Comprehensive Income Loss Reclassification Adjustment From A O C I On Derivatives Before Tax
Other comprehensive income
Other Comprehensive Income Loss Before Tax
Income tax benefit (expense)
Other Comprehensive Income Loss Tax
Other comprehensive income, net
Other Comprehensive Income Loss Net Of Tax
Comprehensive Loss
Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest
Comprehensive Loss attributable to Noncontrolling Interests in Subsidiaries
Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest
Comprehensive Loss attributable to SEACOR Marine Holdings Inc.
Comprehensive Income Net Of Tax
Percentage of owned companies derivative losses on cash flow hedges reclassification to equity in earnings.
Reclassification of derivative losses on cash flow hedges to equity in earnings
Percentage Of Owned Companies Derivative Losses On Cash Flow Hedges Reclassification To Equity In Earnings
Stock granted during period shares share based compensation.
Stock repurchased during period value exercise of warrants.
Adjustments to additional paid-in capital forfeiture of employee share.
Statement Of Stockholders Equity [Abstract]
Equity Components
Statement Equity Components [Axis]
Equity Component
Equity Component [Domain]
Common Stock [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Additional Paid In Capital [Member]
Treasury Stock [Member]
Treasury Stock [Member]
Retained Earnings [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income [Member]
Non-Controlling Interests In Subsidiaries [Member]
Noncontrolling Interest [Member]
Balance
Balance (in shares)
Impact of adoption of new accounting standard
Cumulative Effect Of New Accounting Principle In Period Of Adoption
Issuance of Common Stock
Stock Issued During Period Value New Issues
Issuance of Common Stock (in shares)
Stock Issued During Period Shares New Issues
Forfeiture of employee share awards (in shares)
Stock Issued During Period Shares Restricted Stock Award Forfeited
Restricted stock grants
Stock Issued During Period Value Restricted Stock Award Gross
Restricted stock grants (in shares)
Stock Issued During Period Shares Restricted Stock Award Gross
Amortization of employee share awards
Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value
Amortization of employee share awards (Shares)
Stock Issued During Period Shares Share Based Compensation
Exercise of options
Stock Issued During Period Value Stock Options Exercised
Exercise of options (in shares)
Stock Issued During Period Shares Stock Options Exercised
Exercise of Warrants
Stock Repurchased During Period Value Exercise Of Warrants
Stock repurchased during period shares exercise of warrants.
Exercise of Warrants (in shares)
Stock Repurchased During Period Shares Exercise Of Warrants
Restricted stock vesting
Treasury Stock Value Acquired Cost Method
Restricted stock vesting (in shares)
Treasury Stock Shares Acquired
Director share awards
Stock Issued During Period Value Issued For Services
Director share awards (in shares)
Stock Issued During Period Shares Issued For Services
Acquisition of consolidated joint venture
Stock Granted During Period Value Sharebased Compensation
Acquisition of consolidated joint venture (in shares)
Stock Granted During Period Shares Share Based Compensation
Forfeiture of employee share awards
Adjustments To Additional Paid In Capital Forfeiture Of Employee Share
Other comprehensive (loss) income
Balance
Balance (in shares)
Balance
Stockholders Equity Including Portion Attributable To Noncontrolling Interest Adjusted Balance1
The value of restricted stock that has vested during the period
The amount of expense for director stock awards.
The net amount of cash paid for or received to settle derivatives during the period not designated as hedges.
Construction reserve funds transferred to short term cash.
Payment to subsidiary shares from noncontrolling interests.
Amount of cash inflow from exercise of stock options and warrants granted.
Cash, cash equivalents, restricted cash and restricted cash equivalents, period increase (decrease), continuing operations, including exchange rate effect.
Cash, cash equivalents, restricted cash and restricted cash equivalents, period increase (decrease), discontinued operations, including exchange rate effect.
Noncash decrease in joint venture investments related to acquisition.
Noncash increase in long term debt related to asset purchases.
Statement Of Cash Flows [Abstract]
Cash Flows from Continuing Operating Activities:
Net Cash Provided By Used In Operating Activities Continuing Operations [Abstract]
Net Loss
Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Adjustments Noncash Items To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities [Abstract]
Deferred financing costs amortization
Amortization Of Financing Costs
Amortization of employee share awards
Employee Benefits And Share Based Compensation
Restricted stock vesting
Restricted Stock Vesting
Director share awards
Director Stock Awards
Debt discount amortization
Amortization Of Debt Discount Premium
Bad debt recoveries
Provision For Doubtful Accounts
Loss from equipment sales, retirements or impairments
Derivative (gains) losses
Cash settlement (payments) on derivative transactions, net
Payments For Proceeds From Derivative Instruments Operating Activities
Currency losses
Deferred income taxes
Deferred Income Tax Expense Benefit
Equity losses
Dividends received from equity investees
Proceeds From Dividends Received
Changes in Operating Assets and Liabilities:
Increase Decrease In Operating Capital [Abstract]
Accounts receivables
Increase Decrease In Receivables
Other assets
Increase Decrease In Prepaid Deferred Expense And Other Assets
Accounts payable and accrued liabilities
Increase Decrease In Accounts Payable And Accrued Liabilities
Net cash used in operating activities
Net Cash Provided By Used In Operating Activities Continuing Operations
Cash Flows from Continuing Investing Activities:
Net Cash Provided By Used In Investing Activities Continuing Operations [Abstract]
Purchases of property and equipment
Payments To Acquire Property Plant And Equipment
Proceeds from disposition of property and equipment
Proceeds From Sale Of Property Plant And Equipment
Construction reserve funds utilized
Payments For Proceeds From Other Investing Activities
Construction reserve funds transferred to short-term cash
Construction Reserve Funds Transferred To Short Term Cash
Purchase of subsidiary from joint venture
Payments To Acquire Interest In Joint Venture
Investments in and advances to 50% or less owned companies
Payments To Acquire Equity Method Investments
Net cash provided by (used in) investing activities
Net Cash Provided By Used In Investing Activities Continuing Operations
Cash Flows from Continuing Financing Activities:
Net Cash Provided By Used In Financing Activities Continuing Operations [Abstract]
Payments on long-term debt
Repayments Of Long Term Debt
Purchase of subsidiary shares from noncontrolling interests
Payment To Subsidiary Shares From Noncontrolling Interests
Proceeds from exercise of stock options and Warrants
Proceeds From Stock Options And Warrants Exercised
Net cash used in financing activities
Net Cash Provided By Used In Financing Activities
Effects of Exchange Rate Changes on Cash and Cash Equivalents
Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents
Net Decrease in Cash, Restricted Cash and Cash Equivalents
Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Continuing Operations Including Exchange Rate Effect
Cash Flows from Discontinued Operations:
Net Cash Provided By Used In Discontinued Operations [Abstract]
Operating Activities
Cash Provided By Used In Operating Activities Discontinued Operations
Investing Activities
Cash Provided By Used In Investing Activities Discontinued Operations
Effects of Exchange Rate Changes on Cash, Restricted Cash and Cash Equivalents
Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Disposal Group Including Discontinued Operations
Net Decrease in Cash, Restricted Cash and Cash Equivalents on Discontinued Operations
Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Discontinued Operations Including Exchange Rate Effect
Net Decrease in Cash, Restricted Cash and Cash Equivalents
Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect
Cash, Restricted Cash and Cash Equivalents, Beginning of Period
Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations
Cash, Restricted Cash and Cash Equivalents, End of Period
Supplemental disclosures:
Supplemental Cash Flow Information [Abstract]
Cash paid for interest
Interest Paid Net
Taxes Paid
Income Taxes Paid Net
Noncash Investing and Financing Activities:
Noncash Investing And Financing Items [Abstract]
Increase in property, plant and equipment related to an acquisition
Noncash Or Part Noncash Acquisition Fixed Assets Acquired1
Decrease in joint venture investments related to an acquisition
Noncash Decrease In Joint Venture Investments Related To Acquisition
Increase in long-term debt related to an acquisition
Noncash Or Part Noncash Acquisition Debt Assumed1
Increase in long-term debt related to asset purchases
Noncash Increase In Long Term Debt Related To Asset Purchases
Increase in capital expenditures in accounts payable and accrued liabilities
Capital Expenditures Incurred But Not Yet Paid
Basis of presentation and accounting policies.
Basis Of Presentation And Accounting Policies [Abstract]
Basis of Presentation and Accounting Policies
Basis Of Accounting
Restructuring And Related Activities [Abstract]
Transformation, Facility Restructuring and Severance Charges
Restructuring And Related Activities Disclosure [Text Block]
Schedule Of Investments [Abstract]
Seacosco Acquisition
Equity Method Investments Disclosure [Text Block]
Equipment Acquisitions and Dispositions
Property Plant And Equipment Disclosure [Text Block]
Debt Disclosure [Abstract]
Long Term Debt
Long Term Debt [Text Block]
Leases [Abstract]
Leases
Lessee Operating Leases [Text Block]
Income Tax Disclosure [Abstract]
Income Taxes
Income Tax Disclosure [Text Block]
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Derivative Instruments and Hedging Strategies
Derivative Instruments And Hedging Activities Disclosure [Text Block]
Fair Value Disclosures [Abstract]
Fair Value Measurements
Fair Value Disclosures [Text Block]
Notes to Financial Statements
Stockholders' Equity
Stockholders Equity Note Disclosure [Text Block]
Noncontrolling Interest [Abstract]
Noncontrolling Interests in Subsidiaries
Minority Interest Disclosure [Text Block]
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies
Commitments And Contingencies Disclosure [Text Block]
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock Based Compensation
Disclosure Of Compensation Related Costs Share Based Payments [Text Block]
Segment Reporting [Abstract]
Segment Information
Segment Reporting Disclosure [Text Block]
Discontinued Operations And Disposal Groups [Abstract]
Discontinued Operations
Disposal Groups Including Discontinued Operations Disclosure [Text Block]
Disclosure of accounting policy pertaining to recently adopted accounting standards.
Accounting Policies [Abstract]
Recently Adopted Accounting Standards
Recently Adopted Accounting Standards Policy [Text Block]
Basis of Consolidation
Consolidation Policy [Text Block]
Use of Estimates
Use Of Estimates
Revenue Recognition
Revenue Recognition Policy [Text Block]
Cash and Cash Equivalents
Cash And Cash Equivalents Policy [Text Block]
Property and Equipment
Property Plant And Equipment Policy [Text Block]
Impairment of Long-Lived Assets and Impairment of 50% or Less Owned Companies
Impairment Or Disposal Of Long Lived Assets Including Intangible Assets Policy Policy [Text Block]
Income Taxes
Income Tax Policy [Text Block]
Accumulated Other Comprehensive Income (Loss)
Comprehensive Income Policy Policy [Text Block]
Loss Per Share
Earnings Per Share Policy [Text Block]
Schedule of Deferred Revenues
Deferred Revenue By Arrangement Disclosure [Text Block]
Schedule of Property and Equipment Useful Life
Property Plant And Equipment [Text Block]
Schedule of Accumulated Other Comprehensive Loss
Schedule Of Comprehensive Income Loss Table [Text Block]
Schedule of Components of Restructuring Charges By Segment
Schedule Of Restructuring And Related Costs [Text Block]
Schedule of cumulative restructuring and reorganization cost incurred to date, estimated remaining and to be incurred.
Schedule of Cumulative Restructuring and Reorganization Cost Incurred to Date, Estimated Remaining and to be Incurred
Schedule Of Cumulative Restructuring And Reorganization Cost Incurred To Date Estimated Remaining And To Be Incurred Table [Text Block]
Summary of Purchase Price Allocation of Acquired Assets
Equity Method Investments [Text Block]
Schedule of Long-term Debt Obligations
Schedule Of Debt Instruments [Text Block]
Summary of Future Minimum Payments For Operating Leases
Lessee Operating Lease Liability Maturity Table [Text Block]
Summary of Components of Leases Expense
Lease Cost Table [Text Block]
Schedule of other information related to operating leases.
Summary of Other Information Related to Operating Leases
Schedule Of Other Information Related To Operating Leases Table [Text Block]
Schedule of Effective Income Tax Rate Reconciliation
Schedule Of Effective Income Tax Rate Reconciliation Table [Text Block]
Schedule of Fair Value of Derivative Assets and Liabilities
Schedule Of Derivative Instruments In Statement Of Financial Position Fair Value [Text Block]
Schedule of Gains (Losses) on Derivative Instruments not Designated as Hedging Instruments
Schedule Of Other Derivatives Not Designated As Hedging Instruments Statements Of Financial Performance And Financial Position Location Table [Text Block]
Schedule of Fair Value of Assets and Liabilities Measured on Recurring Basis
Schedule Of Fair Value Assets And Liabilities Measured On Recurring Basis Table [Text Block]
Schedule of Estimated Fair Values of Financial Assets and Liabilities
Fair Value By Balance Sheet Grouping [Text Block]
Schedule of Other Assets and Liabilities Measured at Fair Value
Fair Value Assets Measured On Recurring And Nonrecurring Basis Table [Text Block]
Tabular disclosure of noncontrolling interest.
Schedule of Noncontrolling Interests in the Company's Consolidated Subsidiaries
Schedule Of Noncontrolling Interest Table [Text Block]
Summary of Transactions in Connection with Equity Incentive Plans
Schedule Of Share Based Compensation Activity Table [Text Block]
Schedule of Segment Reporting Information, by Segment
Schedule Of Segment Reporting Information By Segment [Text Block]
Schedule of Assets Held for Sale
Schedule Of Disposal Groups Including Discontinued Operations Income Statement Balance Sheet And Additional Disclosures [Text Block]
Basis of presentation and accounting policies.
Basis of presentation and accounting policies.
Basis Of Presentation And Accounting Policies [Table]
Basis Of Presentation And Accounting Policies [Table]
Statistical Measurement
Range [Axis]
Statistical Measurement
Range [Member]
Minimum
Minimum [Member]
Maximum
Maximum [Member]
Legal Entity
Legal Entity [Axis]
Entity
Entity [Domain]
SEACOR Marine Foreign Holdings.
SEACOR Marine Foreign Holdings
S E A C O R Marine Foreign Holdings [Member]
Geographic Distribution
Geographic Distribution [Axis]
Geographic Distribution
Geographic Distribution [Domain]
Geographic Distribution, Domestic
Geographic Distribution Domestic [Member]
Geographic Distribution, Foreign
Geographic Distribution Foreign [Member]
Balance Sheet Location
Balance Sheet Location [Axis]
Balance Sheet Location
Balance Sheet Location [Domain]
Prepaid vessel management fees.
Prepaid Vessel Management Fees
Prepaid Vessel Management Fees [Member]
Antidilutive Securities
Antidilutive Securities Excluded From Computation Of Earnings Per Share By Antidilutive Securities [Axis]
Antidilutive Securities, Name
Antidilutive Securities Name [Domain]
Restricted Stock
Restricted Stock [Member]
Employee Stock Option
Employee Stock Option [Member]
Basis Of Presentation And Accounting Policies [Line Items]
Basis Of Presentation And Accounting Policies [Line Items]
Equity method investment, ownership percentage
Equity Method Investment Ownership Percentage
Balance at beginning of period
Contract With Customer Liability
Revenues deferred during the period
Deferred Revenue Additions
Revenues recognized during the period
Deferred Revenue Revenue Recognized1
Balance at end of period
Contract with customer, liability
Prepaid management fees
Construction reserve funds current.
Construction reserve funds, current
Construction Reserve Funds Current
Schedule Of Property Plant And Equipment [Table]
Schedule Of Property Plant And Equipment [Table]
Property, Plant and Equipment, Type
Property Plant And Equipment By Type [Axis]
Property, Plant and Equipment, Type
Property Plant And Equipment Type [Domain]
Information pertaining to crew transfer vessels.
Crew Transfer Vessels
Crew Transfer Vessels [Member]
Information pertaining to all other offshore support vessels.
All Other Offshore Support Vessels
All Other Offshore Support Vessels [Member]
Property Plant And Equipment [Line Items]
Property Plant And Equipment [Line Items]
Estimated useful life (Year)
Property Plant And Equipment Useful Life
Capitalized interest costs, including allowance for funds used during construction, total
Interest Costs Incurred Capitalized
Partial impairment of right to use assets.
Additional impairment of right-to-use assets.
Impairment of long-lived assets right-to-use
Impairment Of Long Lived Assets Held For Use
Partial impairment of right to use assets
Partial Impairment Of Right To Use Assets
Additional impairment of right-to-use assets
Additional Impairment Of Right To Use Assets
Equity method investment, other than temporary impairment
Equity Method Investment Other Than Temporary Impairment
Effective income tax rate reconciliation, percent, total
Effective Income Tax Rate Continuing Operations
Accumulated Other Comprehensive Income Loss [Table]
Accumulated Other Comprehensive Income Loss [Table]
Accumulated Foreign Currency Adjustment Attributable to Parent
Accumulated Translation Adjustment [Member]
Accumulated Loss, Net, Cash Flow Hedge, Parent
Accumulated Gain Loss Net Cash Flow Hedge Parent [Member]
AOCI Attributable to Parent
Accumulated Foreign Currency Adjustment Attributable to Noncontrolling Interest
Accumulated Foreign Currency Adjustment Attributable To Noncontrolling Interest [Member]
Accumulated Gain (Loss), Net, Cash Flow Hedge, Noncontrolling Interest
Accumulated Gain Loss Net Cash Flow Hedge Noncontrolling Interest [Member]
AOCI Attributable to Noncontrolling Interest
Aoci Attributable To Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated Other Comprehensive Income Loss [Line Items]
Other comprehensive loss
Class of warrant or right, exercise price of warrants or rights
Class Of Warrant Or Right Exercise Price Of Warrants Or Rights1
Incremental common shares attributable to conversion of debt securities, total
Incremental Common Shares Attributable To Conversion Of Debt Securities
Antidilutive securities excluded from computation of earnings per share, amount
Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount
Schedule Of Restructuring And Related Costs [Table]
Schedule Of Restructuring And Related Costs [Table]
Restructuring Plan
Restructuring Plan [Axis]
Restructuring Plan
Restructuring Plan [Domain]
Transformation Plan.
Transformation Plan
Transformation Plan [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring Cost And Reserve [Line Items]
Restructuring and related activities, description
Restructuring And Related Activities Description
Severance charges.
Restructuring and transformation charges
Restructuring Charges
Severance charges
Severance Charges
Other restructuring charges
Other Restructuring Costs
Geographical
Statement Geographical [Axis]
Geographical
Segment Geographical [Domain]
UNITED STATES
UNITED STATES
Africa
Africa [Member]
Information pertaining to Middle East and Asia.
Middle East and Asia
Middle East And Asia [Member]
Latin America
Latin America [Member]
Europe
Europe [Member]
Severance Charges
Severance Costs1
Other Charges
Total Charges
Cumulative restructuring costs incurred to date in operating charges
Restructuring And Related Cost Cost Incurred To Date1
Estimated additional restructuring costs to be incurred
Restructuring And Related Cost Expected Cost Remaining1
Total restructuring and reorganization costs incurred and to be incurred
Restructuring And Related Cost Expected Cost1
Schedule Of Investments [Table]
Schedule Of Investments [Table]
Investment, Name
Schedule Of Equity Method Investment Equity Method Investee Name [Axis]
Investment, Name
Equity Method Investee Name [Domain]
SEACOR Offshore Delta LLC.
SEACOR Offshore Delta LLC
S E A C O R Offshore Delta L L C [Member]
Ownership
Ownership [Axis]
Ownership
Ownership [Domain]
SEACOR offshore asia.
SEACOR Offshore Asia
S E A C O R Offshore Asia [Member]
Collaborative Arrangement and Arrangement Other than Collaborative
Type Of Arrangement [Axis]
Collaborative Arrangement and Arrangement Other than Collaborative
Arrangements And Nonarrangement Transactions [Member]
Sale and purchase agreement.
Sale And Purchase Agreement
Sale And Purchase Agreement [Member]
Member stands for platform supply vessels ("PSVs").
Platform Supply Vessels
Platform Supply Vessels [Member]
Deferred purchase agreements.
Deferred Purchase Agreements
Deferred Purchase Agreements [Member]
Schedule Of Investments [Line Items]
Schedule Of Investments [Line Items]
Purchase price payable for equity method investment.
Purchase price payable for equity method investment at or prior to closing of transaction.
Purchase price payable for equity method investment in year one.
Purchase price payable for equity method investment in year two.
Purchase price payable for equity method investment in year three.
Purchase price payable for equity method investment in year four.
Percentage of purchase price fixed accrued interest rate for equity method investment in year one.
Percentage of purchase price fixed accrued interest rate for equity method investment in year two.
Percentage of purchase price fixed accrued interest rate for equity method investment in year three.
Percentage of purchase price fixed accrued interest rate for equity method investment in year four.
Number of vessels owned.
Percentage of voting interests acquired
Business Acquisition Percentage Of Voting Interests Acquired
Purchase price payable for equity method investment
Purchase Price Payable For Equity Method Investment
Purchase price payable for equity method investment at or prior to closing of transaction
Purchase Price Payable For Equity Method Investment At Or Prior To Closing Of Transaction
Purchase price payable for equity method investment in first year
Purchase Price Payable For Equity Method Investment In Year One
Purchase price payable for equity method investment in second year
Purchase Price Payable For Equity Method Investment In Year Two
Purchase price payable for equity method investment in third year
Purchase Price Payable For Equity Method Investment In Year Three
Purchase price payable for equity method investment in fourth year
Purchase Price Payable For Equity Method Investment In Year Four
Purchase price fixed accrued interest rate in first year
Percentage Of Purchase Price Fixed Accrued Interest Rate For Equity Method Investment In Year One
Purchase price fixed accrued interest rate in second year
Percentage Of Purchase Price Fixed Accrued Interest Rate For Equity Method Investment In Year Two
Purchase price fixed accrued interest rate in third year
Percentage Of Purchase Price Fixed Accrued Interest Rate For Equity Method Investment In Year Three
Purchase price fixed accrued interest rate in fourth year
Percentage Of Purchase Price Fixed Accrued Interest Rate For Equity Method Investment In Year Four
Number of vessels owned
Number Of Vessels Owned
Equity method investment purchase price amortization period.
The number of vessels deliverd to the company.
Number of vessels owned with high specification
Number of vessels owned with identical specification.
Equity method investment, aggregate amount outstanding
Equity Method Investment Summarized Financial Information Liabilities
Equity method investment, amortization of purchase price
Equity Method Investment Purchase Price Amortization Period
Debt instrument, description of floating interest rate basis
Debt Instrument Description Of Variable Rate Basis
Debt instrument, basis spread on floating interest rate
Debt Instrument Basis Spread On Variable Rate1
Number of vessels delivered to the company
Number Of Vessels Delivered To Company
Number of vessels owned with high specification
Number Of Vessels Owned With High Specification
Number of vessels owned with identical specification
Number Of Vessels Owned With Identical Specification
Equity method investment summarized financial information book value of debt acquired.
Equity method investment summarized financial information discount of debt acquired.
SEACOR Offshore Delta LLC
Current Assets
Equity Method Investment Summarized Financial Information Current Assets
Fixed Assets
Equity Method Investment Summarized Financial Information Noncurrent Assets
Current Liabilities
Equity Method Investment Summarized Financial Information Current Liabilities
Book Value of Debt Acquired
Equity Method Investment Summarized Financial Information Book Value Of Debt Acquired
Discount on Debt Acquired
Equity Method Investment Summarized Financial Information Discount Of Debt Acquired
Fair Value of Debt Acquired
Equity Method Investment Summarized Financial Information Fair Value Of Debt Acquired
Total Cost Basis for Purchase
Equity Method Investment Quoted Market Value
Purchase Price
Equity Method Investment Aggregate Cost
Acquisition costs
Equity Method Investment Acquisition Costs
Equity Investment In SEACOR Offshore Delta (f/k/a SEACOSCO)
Equity Method Investments
Total Cost Basis for Purchase
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.
Represents the number of of equipment acquired.
Information pertaining to anchor handling towing supply.
Anchor Handling Towing Supply
Anchor Handling Towing Supply [Member]
Fast support vessels member.
Fast Support Vessels
Fast Support Vessels [Member]
Specialty vessel member.
Specialty Vessel
Specialty Vessel [Member]
Vessel under construction.
Vessel Under Construction
Vessel Under Construction [Member]
Cash and Cash Equivalents
Cash And Cash Equivalents [Axis]
Cash and Cash Equivalents
Restricted Cash And Cash Equivalents Cash And Cash Equivalents [Member]
Cash
Cash [Member]
Payments to acquire property, plant, and equipment, including fair value hedges
Payments To Acquire Property Plant And Equipment Including Fair Value Hedges
Number of equipment acquired
Number Of Equipment Acquired
Represents the number of equipment sold.
Proceeds from property, plant, and equipment, including deposits and gain on sale.
Amount of cash inflow for receipts of deposits.
Number of equipment sold
Number Of Equipment Sold
Proceeds from property, plant, and equipment, including deposits and gain on sale
Proceeds From Property Plant And Equipment Including Deposits And Gain On Sale
Proceeds from deposits
Proceeds From Deposits
Gain (loss) on disposition of property, plant and equipment
Gain Loss On Sale Of Property Plant Equipment
Increase (decrease) in contract with customer, liability
Increase Decrease In Contract With Customer Liability
Debt Instrument [Table]
Debt Instrument [Table]
Long-term Debt, Type
Longterm Debt Type [Axis]
Long-term Debt, Type
Longterm Debt Type [Domain]
Recourse.
Recourse Long-Term Debt
Recourse [Member]
Non recourse.
Non-Recourse Long-Term Debt
Non Recourse [Member]
Debt Instrument
Debt Instrument [Axis]
Debt Instrument, Name
Debt Instrument Name [Domain]
Member represents convertible senior notes.
Convertible Senior Notes
Convertible Senior Notes [Member]
Member stands for SEACOR Marine Foreign Holdings Syndicated Credit Facility.
SEACOR Marine Foreign Holdings Syndicated Credit Facility
S E A C O R Marine Foreign Holdings Syndicated Credit Facility [Member]
Represents information about Sea-Cat Crewzer III term loan facility.
Sea-Cat Crewzer III Term Loan Facility
Sea Cat Crewzer I I I Term Loan Facility [Member]
Member stands for SEACOR Offshore Delta (formerly known as SEACOSCO) Acquisition Debt.
SEACOR Offshore Delta (f/k/a SEACOSCO) Acquisition Debt
S E A C O R Offshore Delta Formerly Known As S E A C O S C O Acquisition Debt [Member]
Member stands for SEACOR Delta (formerly known as SEACOSCO) Shipyard Financing.
SEACOR Delta (f/k/a SEACOSCO) Shipyard Financing
S E A C O R Delta Formerly Known As S E A C O S C O Shipyard Financing [Member]
Member stands for SEACOR Alpine Shipyard Financing.
SEACOR Alpine Shipyard Financing
S E A C O R Alpine Shipyard Financing [Member]
Member stands for SEACOR 88/888 term loan.
SEACOR 88/888 Term Loan
S E A C O R88888 Term Loan [Member]
Member constains information about BNDES equipment consturction finance notes.
BNDES Equipment Construction Finance Notes
B N D E S Equipment Construction Finance Notes [Member]
Information pertaining to Falcon Global USA LLC term loan facility.
Falcon Global USA Term Loan Facility
Falcon Global U S A Term Loan Facility [Member]
Represents a member containing information about Falcon Global USA Revolver facilitis.
Falcon Global USA Revolver
Falcon Global U S A Revolver [Member]
Mebers stands for Windcat workboats facilities.
Windcat Workboats Facilities
Windcat Workboats Facilities [Member]
Debt Instrument [Line Items]
Debt Instrument [Line Items]
Long-term Debt, Gross
Debt Instrument Carrying Amount
Current portion due within one year
Long Term Debt Current
Unamortized debt discount
Debt Instrument Unamortized Discount
Deferred financing costs
Deferred Finance Costs Noncurrent Net
Long-term debt, less current portion
Long Term Debt Noncurrent
Number of vessels acquired.
SEACOR Delta Shipyard Financing
Business Acquisition
Business Acquisition [Axis]
Business Acquisition, Acquiree
Business Acquisition Acquiree [Domain]
Information pertaining to SEACOSCO Offshore LLC.
SEACOSCO Offshore LLC
S E A C O S C O Offshore L L C [Member]
Number of vessels acquired
Number Of Vessels Acquired
Debt instrument covenant compliance debt equity ratio.
Sea-Cat Crewzer Three Term Loan Facility.
Sea-Cat Crewzer III Term Loan Facility
Sea Cat Crewzer Three Term Loan Facility [Member]
FGUSA omnibus amendment.
FGUSA Omnibus Amendment
F G U S A Omnibus Amendment [Member]
Term and revolving loan facility.
Term and Revolving Loan Facility
Term And Revolving Loan Facility [Member]
SEACOR Alps.
SEACOR Alps
S E A C O R Alps [Member]
SEACOR Andes.
SEACOR Andes
S E A C O R Andes [Member]
SEACOR Atlas.
SEACOR Atlas
S E A C O R Atlas [Member]
Scenario
Statement Scenario [Axis]
Scenario
Scenario Unspecified [Domain]
Forecast
Scenario Forecast [Member]
SEACOR Delta (f/k/a SEACOSCO)
Related to the loan facility with DNB Bank ASA.
Loan Facility With DNB Bank ASA
Loan Facility With D N B Bank A S A [Member]
Guarantor Obligations, Nature
Guarantee Obligations By Nature [Axis]
Guarantor Obligations, Nature
Guarantee Obligations Nature [Domain]
Lease obligations and labor and performance guarantee.
Lease Obligations and Labor and Performance Guaranties
Lease Obligations And Labor And Performance Guarantee [Member]
Net financial debt to equity ratio
Debt Instrument Covenant Compliance Debt Equity Ratio
Maximum borrowing capacity under a debt agreement on the amount that could be borrowed with a combination of, but not limited to, a line of credit and term loan.
Agreement extension term, period.
Debt agreement maximum borrowing capacity
Debt Agreement Maximum Borrowing Capacity
Repayment terms
Debt Instrument Payment Terms
Repayments of long-term debt, total
Extension term of Guaranty
Agreement Extension Term Period
Debt instrument, percentage of financing on cost of each vessels.
Number of vessels scheduled to be delivered.
Debt instrument, interest rate
Debt Instrument Interest Rate Stated Percentage
Percentage of amount of loan to be financed
Debt Instrument Percentage Of Financing On Cost Of Each Vessels
Debt instrument, term of delivery
Debt Instrument Term
Number of vessels scheduled to be delivered
Number Of Vessels Scheduled To Be Delivered
Application fee paid in conjunction with amendment and amortized over credit facility term.
Debt instrument extended maturity date.
Line of credit facility, maximum borrowing capacity
Line Of Credit Facility Maximum Borrowing Capacity
Debt instrument, maturity date
Debt Instrument Maturity Date
Debt instrument, extended maturity date
Debt Instrument Extended Maturity Date
Application fee paid in conjunction with amendment and amortized over credit facility term
Application Fee Paid In Conjunction With Amendment And Amortized Over Credit Facility Term
Line of credit facility, amount available under credit facilities
Line Of Credit Facility Current Borrowing Capacity
Number of additional vessels owned.
Number of additional vessels owned
Number Of Additional Vessels Owned
Number of vessels purchased from the company.
Number of vessels purchased from the company
Number Of Vessels Purchased From Company
Letters of credit outstanding, amount
Letters Of Credit Outstanding Amount
Number of operating leases on equipment.
Lessee Lease Description [Table]
Lessee Lease Description [Table]
Anchor Handling Towing Supply
Information pertaining to liftboats.
Liftboats
Liftboats [Member]
Information pertaining to vessels.
Vessels
Vessels [Member]
Member stands for other equipment.
Other Equipment
Other Equipment [Member]
Lessee Lease Description [Line Items]
Lessee Lease Description [Line Items]
Number of operating leases on equipment
Number Of Operating Leases On Equipment
Operating lease, lease terms (in duration)
Lessee Operating Lease Term Of Contract
Remainder of 2020
Lessee Operating Lease Liability Payments Remainder Of Fiscal Year
2021
Lessee Operating Lease Liability Payments Due Year Two
2022
Lessee Operating Lease Liability Payments Due Year Three
2023
Lessee Operating Lease Liability Payments Due Year Four
2024
Lessee Operating Lease Liability Payments Due Year Five
Years subsequent to 2024
Lessee Operating Lease Liability Payments Due After Year Five
Operating lease payments due
Lessee Operating Lease Liability Payments Due
Interest component
Lessee Operating Lease Liability Undiscounted Excess Amount
Total operating leases
Operating Lease Liability
Current portion of long-term operating lease liabilities
Operating lease expense
Operating Lease Expense
Short-term lease expense (lease duration of twelve months or less at lease commencement)
Short Term Lease Cost
Total Lease expense
Lease Cost
Operating cash flows from operating leases
Operating Lease Payments
Right-of-use assets obtained for operating lease liabilities
Right Of Use Asset Obtained In Exchange For Operating Lease Liability
Weighted average remaining lease term, in years
Operating Lease Weighted Average Remaining Lease Term1
Weighted average discount rate
Operating Lease Weighted Average Discount Rate Percent
Effective income tax rate reconciliation foreign income tax not creditable percent.
Effective income tax rate reconciliation acquisition of business percent.
Effective income tax rate reconciliation cares act net operating loss carryback.
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Effective Income Tax Rate Continuing Operations Tax Rate Reconciliation [Abstract]
Statutory rate
Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate
Foreign taxes not creditable against U.S. income tax
Effective Income Tax Rate Reconciliation Foreign Income Tax Not Creditable Percent
Falcon Global Acquisition
Effective Income Tax Rate Reconciliation Acquisition Of Business Percent
Noncontrolling interests
Effective Income Tax Rate Reconciliation Minority Interest Income Expense
CARES Act NOL Carryback
Effective Income Tax Rate Reconciliation Cares Act Net Operating Loss Carryback
Other
Effective Income Tax Rate Reconciliation Other Adjustments
Effective income tax rate reconciliation, percent, total
Expected cash tax refunds receivable.
Income Taxes.
Income taxes.
Income Taxes [Table]
Income Taxes [Table]
Tax refund and indemnification agreement.
Tax Refund Agreement
Tax Refund And Indemnification Agreement [Member]
Income Taxes [Line Items]
Income Taxes [Line Items]
Expected to cash tax refunds receivable
Expected Cash Tax Refunds Receivable
Percentage of net operating losses facilitate tax savings.
Transaction fee.
Expected cash tax refunds receivable without restrictions to use.
Expected cash tax refunds receivable with restrictions to use.
Tax refunds restricted cash.
Percentage of net operating losses facilitate tax savings
Percentage Of Net Operating Losses Facilitate Tax Savings
Transaction fee
Transaction Fee
Cash tax refunds receivable without restrict to use
Expected Cash Tax Refunds Receivable With Out Restrictions To Use
Cash tax refunds receivable with restrict to use
Expected Cash Tax Refunds Receivable With Restrictions To Use
Tax refunds restricted cash
Tax Refunds Restricted Cash
Derivative [Table]
Derivative [Table]
Hedging Designation
Hedging Designation [Axis]
Hedging Designation
Hedging Designation [Domain]
Designated as Hedging Instrument
Designated As Hedging Instrument [Member]
Not Designated as Hedging Instrument
Nondesignated [Member]
Derivative Instrument
Derivative Instrument Risk [Axis]
Derivative Contract
Derivative Contract Type [Domain]
Interest Rate Swap
Interest Rate Swap [Member]
Hedging Relationship
Derivative Instruments Gain Loss By Hedging Relationship [Axis]
Hedging Relationship
Hedging Relationship [Domain]
Cash Flow Hedging
Cash Flow Hedging [Member]
Derivative [Line Items]
Derivative [Line Items]
Derivative instruments (included in other receivables)
Derivative Assets
Derivative Liability
Derivative Liabilities
Conversion option liability on Convertible Senior Notes
Embedded Derivative Fair Value Of Embedded Derivative Liability
Represents information about Windcat Workboats Ltd.
Windcat Workboats
Windcat Workboats Ltd [Member]
Interest rate swap agreement three point one nine five percent.
3.32% Interest Rate Swap Agreement
Interest Rate Swap Agreement Three Point Three Two Percent [Member]
Interest rate swap agreement three point one nine five percent.
3.195% Interest Rate Swap Agreement
Interest Rate Swap Agreement Three Point One Nine Five Percent [Member]
SEACOR 88888.
SEACOR 88/888
S E A C O R88888 [Member]
Information pertaining to MexMar.
MexMar
Mex Mar [Member]
Derivatives notional amount.
Derivative, number of instruments held, total
Derivative Number Of Instruments Held
Derivative, fixed interest rate
Derivative Fixed Interest Rate
Derivative, notional amount
Derivatives Notional Amount
Embedded Derivative Financial Instruments
Embedded Derivative Financial Instruments [Member]
Gains (losses) on derivative instruments
Derivative Instruments Not Designated As Hedging Instruments Gain Loss Net
Fair value portion of construction reserve funds.
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Table]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Table]
Fair Value Hierarchy and NAV
Fair Value By Fair Value Hierarchy Level [Axis]
Fair Value Hierarchy and NAV
Fair Value Measurements Fair Value Hierarchy [Domain]
Fair Value, Inputs, Level 1
Fair Value Inputs Level1 [Member]
Fair Value, Inputs, Level 2
Fair Value Inputs Level2 [Member]
Fair Value, Inputs, Level 3
Fair Value Inputs Level3 [Member]
Measurement Frequency
Fair Value By Measurement Frequency [Axis]
Measurement Frequency
Fair Value Measurement Frequency [Domain]
Fair Value, Measurements, Recurring
Fair Value Measurements Recurring [Member]
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]
Conversion Option Liability on Convertible Senior Notes
Derivative Instruments And Hedges Liabilities Noncurrent
Construction reserve funds
Construction Reserve Funds Fair Value Disclosure
Fair Value By Balance Sheet Grouping [Table]
Fair Value By Balance Sheet Grouping [Table]
Measurement Basis
Fair Value By Measurement Basis [Axis]
Fair Value Disclosure Item Amounts [Default]
Portion At Fair Value Fair Value Disclosure [Member]
Fair Value Measurement
Fair Value Disclosure Item Amounts [Domain]
Reported Value Measurement
Carrying Reported Amount Fair Value Disclosure [Member]
Estimate of Fair Value Measurement
Estimate Of Fair Value Fair Value Disclosure [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash, cash equivalents and restricted cash
Cash And Cash Equivalents Fair Value Disclosure
Investments, at cost, in 50% or less owned companies (included in other assets)
Cost Method Investments Fair Value Disclosure
Long-term debt, including current portion
Long Term Debt Fair Value
Specialty.
Specialty
Specialty [Member]
Property and equipment
Property Plant And Equipment Fair Value Disclosure
Liftboat and specialty.
Liftboat and Specialty
Liftboat And Specialty [Member]
Impairment charges
Asset Impairment Charges
Equity [Abstract]
Schedule Of Stock By Class [Table]
Schedule Of Stock By Class [Table]
Falcon global holding member.
Falcon Global Holdings
Falcon Global Holding [Member]
Plan Name
Plan Name [Axis]
Plan Name
Plan Name [Domain]
Two Thousand Seventeen equity incentive plan.
2017 Equity Incentive Plan
Two Thousand Seventeen Equity Incentive Plan [Member]
Two Thousand Twenty equity incentive plan.
2020 Equity Incentive Plan
Two Thousand Twenty Equity Incentive Plan [Member]
Class Of Stock [Line Items]
Class Of Stock [Line Items]
Business acquisition, percentage of voting interests acquired
Business acquisition, exchange for consideration
Business Acquisition Equity Interests Issued Or Issuable Number Of Shares Issued
Ownership percentage by parent
Minority Interest Ownership Percentage By Parent
Common shares registered for issuance
Common Stock Capital Shares Reserved For Future Issuance
Common shares authorized for issuance
Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized
Common shares remaining available for issuance
Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant
Minority Interest [Table]
Minority Interest [Table]
Falcon global member.
Falcon Global
Falcon Global [Member]
Other noncontrolling interests member.
Other Noncontrolling Interests
Other Noncontrolling Interests [Member]
Minority Interest [Line Items]
Minority Interest [Line Items]
Noncontrolling interest, ownership percentage by noncontrolling owners
Minority Interest Ownership Percentage By Noncontrolling Owners
Noncontrolling interest
Falcon Global Holdings
Common Stock
Noncontrolling Interest, ownership percentage by parent
Business acquisition, percentage of voting interests acquired
Net income (loss), including portion attributable to noncontrolling interest, total
Net income (loss) attributable to noncontrolling interest, total
Commitments and contingencies.
Commitments and contingencies.
Commitments And Contingencies [Table]
Commitments And Contingencies [Table]
Platform supply vessel.
Platform Supply Vessels
Platform Supply Vessel [Member]
Information pertaining to FSV offshore support vessels.
FSV Offshore Support Vessels
F S V Offshore Support Vessels [Member]
Litigation Case
Litigation Case [Axis]
Litigation Case
Litigation Case Type [Domain]
Deficiency notice.
Deficiency Notice
Deficiency Notice [Member]
Counterparty Name
Counterparty Name [Axis]
Counterparty Name
Repurchase Agreement Counterparty Name [Domain]
Represents wholly owned subsidiary Seabulk Overseas.
Seabulk Overseas
Seabulk Overseas [Member]
Related Party
Related Party Transactions By Related Party [Axis]
Related Party
Related Party [Domain]
Information pertaining to SEACOR Holdings.
SEACOR Holdings
S E A C O R Holdings [Member]
Commitments And Contingencies [Line Items]
Commitments And Contingencies [Line Items]
Remaining capital commitment
Unrecorded Unconditional Purchase Obligation Balance Sheet Amount
Unrecorded unconditional purchase obligation, maximum quantity
Unrecorded Unconditional Purchase Obligation Maximum Quantity
Unrecorded unconditional purchase obligation due within four years
Unrecorded Unconditional Purchase Obligation Balance On Fourth Anniversary
Unrecorded unconditional purchase obligation, due in remainder of fiscal year
Unrecorded Unconditional Purchase Obligation Due In Remainder Of Fiscal Year
Unrecorded unconditional purchase obligation, due within two years
Unrecorded Unconditional Purchase Obligation Balance On Second Anniversary
Litigation deposit.
Cost allocation percentage.
Cost allocation percentage
Cost Allocation Percentage
Potential range of levies
Loss Contingency Estimate Of Possible Loss
Deposited with Court
Litigation Deposit
Amount guaranteed under arrangement
Guarantee Obligations Maximum Exposure
Related party transaction, rate
Related Party Transaction Rate
Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table]
Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table]
Award Type
Award Type [Axis]
Award Type
Share Based Compensation Arrangements By Share Based Payment Award Award Type And Plan Name [Domain]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Outstanding as of the beginning of year (in shares)
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number
Granted (in shares)
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period
Vested (in shares)
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period
Forfeited (in shares)
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period
Outstanding as of the end of year (in shares)
Outstanding as of the beginning of year (in shares)
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number
Granted (in shares)
Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross
Forfeited (in shares)
Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period
Outstanding as of the end of year (in shares)
Treasury stock, shares acquired
Treasury stock, value acquired cost method
The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, including short term lease expenses, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line.
Schedule Of Segment Reporting Information By Segment [Table]
Schedule Of Segment Reporting Information By Segment [Table]
Product and Service
Product Or Service [Axis]
Product and Service
Products And Services [Domain]
Information pertaining to time charter.
Time Charter
Time Charter [Member]
Information pertaining to bareboat charter.
Bareboat Charter
Bareboat Charter [Member]
Other marine services.
Other Marine Services
Other Marine Services [Member]
Information pertaining to personnel services.
Personnel
Personnel [Member]
Information pertaining to repairs and maintenance services.
Repairs and Maintenance
Repairs And Maintenance [Member]
Information pertaining to drydocking services.
Drydocking
Drydocking [Member]
Information pertaining to insurance and loss reserves.
Insurance and Loss Reserves
Insurance And Loss Reserves [Member]
Information pertaining to fuel, lubes and supplies.
Fuel, Lubes and Supplies
Fuel Lubes And Supplies [Member]
Information pertaining to other direct costs and expenses.
Other Direct Costs and Expenses
Other Direct Costs And Expenses [Member]
Europe, Continuing Operations
Segment Reporting Information [Line Items]
Segment Reporting Information [Line Items]
Direct Costs and Expenses
Cost Of Goods And Services Sold And Adjustment
Direct Vessel Profit
Gross Profit
Administrative and general
General And Administrative Expense Including Short Term Lease Expense
Other Costs and Expenses
Other Cost And Expense Operating
Gain (Loss) on Asset Dispositions and Impairments
Operating Loss
The amount of assets, excluding corporate assets.
Total Assets
Assets Excluding Corporate Assets
Consolidation Items
Consolidation Items [Axis]
Consolidation Items
Consolidation Items [Domain]
Corporate, Non-Segment
Corporate Non Segment [Member]
Assets, Total
Equity in earnings (losses) of owned companies.
Segment information.
Segment information.
Segment Information [Table]
Segment Information [Table]
Information pertaining to other offshore marine services joint ventures.
Other Offshore Marine Services Joint Ventures
Other Offshore Marine Services Joint Ventures [Member]
Segment Information [Line Items]
Segment Information [Line Items]
Equity method investments
Equity in Gains (Losses) Earnings of 50% or Less Owned Companies
Equity In Earnings Losses Of Owned Companies
Disposal group including discontinued operation lease expense.
Disposal group including discontinued operation expenses.
Disposal group including discontinued operation gain (loss) on assets disposition and impairments net.
Disposal group including discontinued operation other nonoperating income expense.
Disposal group including discontinued operation income loss before income taxes and income loss from equity method investments.
Disposal group including discontinued operation income tax expense (benefit).
Disposal group including discontinued operation income loss before equity method investments after tax.
Disposal group including discontinued operation income (loss) from equity method investments.
Disposal group discontinued operation operating revenue.
Disposal group discontinued operation costs and expenses.
Disposal group including discontinued operation other nonoperating income expense.
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Table]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Table]
Disposal Group Name
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Axis]
Disposal Group Name
Disposal Groups Including Discontinued Operations Name [Domain]
Boston Putford Offshore Safety Limited.
BPOS
Boston Putford Offshore Safety Limited [Member]
Disposal Group Classification
Disposal Group Classification [Axis]
Disposal Group Classification
Disposal Group Classification [Domain]
Discontinued Operations, Held-for-sale
Discontinued Operations Heldforsale [Member]
Other revenue.
Other Revenue
Other Revenue [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Operating Revenues:
Disposal Group Discontinued Operation Operating Revenue [Abstract]
Operating Revenues
Disposal Group Including Discontinued Operation Revenue
Costs and Expenses:
Disposal Group Discontinued Operation Costs And Expenses [Abstract]
Operating
Disposal Group Including Discontinued Operation Operating Expense
Direct Vessel Profit
Disposal Group Including Discontinued Operation Gross Profit Loss
General and Administrative Expenses
Disposal Group Including Discontinued Operation General And Administrative Expense
Lease Expense
Disposal Group Including Discontinued Operation Lease Expense
Depreciation
Disposal Group Including Discontinued Operation Depreciation And Amortization
Total expenses
Disposal Group Including Discontinued Operation Expenses
Gain on Asset Dispositions and Impairments, Net
Disposal Group Including Discontinued Operation Gain Loss On Assets Disposition And Impairments Net
Operating Income
Disposal Group Including Discontinued Operation Operating Income Loss
Other Income (Expense)
Disposal Group Including Discontinued Operation Other Nonoperating Income Expense [Abstract]
Interest income
Disposal Group Including Discontinued Operation Interest Income
Interest expense
Disposal Group Including Discontinued Operation Interest Expense
Foreign currency translation loss
Disposal Group Including Discontinued Operation Foreign Currency Translation Gains Losses
Other Income (Expense)
Disposal Group Including Discontinued Operation Other Nonoperating Income Expense
Operating Loss Before Equity Earnings of 50% or Less Owned Companies, Net of Tax
Disposal Group Including Discontinued Operation Income Loss Before Income Taxes And Income Loss From Equity Method Investments
Income Tax Expense
Disposal Group Including Discontinued Operation Income Tax Expense Benefit
Operating Loss Before Equity Earnings of 50% or Less Owned Companies
Disposal Group Including Discontinued Operation Income Loss Before Equity Method Investments After Tax
Equity in Earnings of 50% or Less Owned Companies, Net of Tax
Disposal Group Including Discontinued Operation Income Loss From Equity Method Investments
Net (Loss) Income from Discontinued Operations
Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax