10-K Filing

SEACOR MARINE HOLDINGS INC. CIK: 1690334 FY 2020

Filing Information

Form Type	10-K
Accession Number	`0001564590-21-012639`
Period End Date	20201231
Filing Date	20210312
Fiscal Year	2020
Fiscal Period	FY
XBRL Instance	smhi-10k_20201231_htm.xml

Filing Contents

This filing contains the following financial statements:

Balance Sheet 125 Income Statement 154 Cash Flow Statement 143 Stockholders Equity 52 Comprehensive Income 37

Balance Sheet 125 line items

Line Item	Tag	Value	Unit	Period
Trade receivables, allowance for credit loss	`AllowanceForDoubtfulAccountsReceivableCurrent`	$582.00K	USD	Point-in-time
Trade receivables, allowance for credit loss	`AllowanceForDoubtfulAccountsReceivableCurrent`	$455.00K	USD	Point-in-time
Preferred stock, par value (in dollars per share)	`PreferredStockParOrStatedValuePerShare`	$0.01	USD	Point-in-time
Preferred stock, par value (in dollars per share)	`PreferredStockParOrStatedValuePerShare`	$0.01	USD	Point-in-time
Preferred stock, shares authorized (in shares)	`PreferredStockSharesAuthorized`	10.00M	shares	Point-in-time
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$32.67M	USD	Point-in-time
Preferred stock, shares authorized (in shares)	`PreferredStockSharesAuthorized`	10.00M	shares	Point-in-time
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$81.38M	USD	Point-in-time
Restricted cash	`RestrictedCashAndCashEquivalents`	$3.10M	USD	Point-in-time
Restricted cash	`RestrictedCashAndCashEquivalents`	$3.35M	USD	Point-in-time
Preferred stock, shares issued (in shares)	`PreferredStockSharesIssued`	0.00	shares	Point-in-time
Preferred stock, shares issued (in shares)	`PreferredStockSharesIssued`	0.00	shares	Point-in-time
Preferred stock, shares outstanding (in shares)	`PreferredStockSharesOutstanding`	0.00	shares	Point-in-time
Preferred stock, shares outstanding (in shares)	`PreferredStockSharesOutstanding`	0.00	shares	Point-in-time
Trade, net of allowance for credit loss reserve of $582 and $455 in 2020 and 2019, respectively	`AccountsReceivableNetCurrent`	$43.05M	USD	Point-in-time
Trade, net of allowance for credit loss reserve of $582 and $455 in 2020 and 2019, respectively	`AccountsReceivableNetCurrent`	$45.33M	USD	Point-in-time
Common stock, par value (in dollars per share)	`CommonStockParOrStatedValuePerShare`	$0.01	USD	Point-in-time
Common stock, par value (in dollars per share)	`CommonStockParOrStatedValuePerShare`	$0.01	USD	Point-in-time
Other	`OtherReceivablesNetCurrent`	$18.24M	USD	Point-in-time
Common stock, shares authorized (in shares)	`CommonStockSharesAuthorized`	60.00M	shares	Point-in-time
Other	`OtherReceivablesNetCurrent`	$10.92M	USD	Point-in-time
Common stock, shares authorized (in shares)	`CommonStockSharesAuthorized`	60.00M	shares	Point-in-time
Common stock, shares issued (in shares)	`CommonStockSharesIssued`	21.93M	shares	Point-in-time
Receivables from SEACOR Holdings	`DueFromAffiliateCurrent`	$18.83M	USD	Point-in-time
Common stock, shares issued (in shares)	`CommonStockSharesIssued`	23.50M	shares	Point-in-time
Shares held in treasury (in shares)	`TreasuryStockShares`	73,284.00	shares	Point-in-time
Tax Receivable	`IncomeTaxesReceivable`	$13.56M	USD	Point-in-time
Shares held in treasury (in shares)	`TreasuryStockShares`	47,185.00	shares	Point-in-time
Inventories	`InventoryNet`	$576.00K	USD	Point-in-time
Inventories	`InventoryNet`	$1.23M	USD	Point-in-time
Prepaid expenses and other	`PrepaidExpenseAndOtherAssetsCurrent`	$1.94M	USD	Point-in-time
Prepaid expenses and other	`PrepaidExpenseAndOtherAssetsCurrent`	$3.23M	USD	Point-in-time
Assets held for sale	`AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent`	$45.72M	USD	Point-in-time
Assets held for sale	`AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent`	$50.23M	USD	Point-in-time
Total current assets	`AssetsCurrent`	$178.70M	USD	Point-in-time
Total current assets	`AssetsCurrent`	$194.66M	USD	Point-in-time
Historical cost	`PropertyPlantAndEquipmentGross`	$1.05B	USD	Point-in-time
Historical cost	`PropertyPlantAndEquipmentGross`	$1.01B	USD	Point-in-time
Historical cost	`PropertyPlantAndEquipmentGross`	$899.02M	USD	Point-in-time
Accumulated depreciation	`AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment`	$291.54M	USD	Point-in-time
Accumulated depreciation	`AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment`	$418.34M	USD	Point-in-time
Accumulated depreciation	`AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment`	$308.92M	USD	Point-in-time
Property and equipment	`PropertyPlantAndEquipmentExcludingConstructionInProgress`	$629.46M	USD	Point-in-time
Property and equipment	`PropertyPlantAndEquipmentExcludingConstructionInProgress`	$721.34M	USD	Point-in-time
Property and equipment	`PropertyPlantAndEquipmentExcludingConstructionInProgress`	$590.11M	USD	Point-in-time
Construction in progress	`ConstructionInProgressGross`	$70.81M	USD	Point-in-time
Construction in progress	`ConstructionInProgressGross`	$32.33M	USD	Point-in-time
Net property and equipment	`PropertyPlantAndEquipmentNet`	$660.91M	USD	Point-in-time
Net property and equipment	`PropertyPlantAndEquipmentNet`	$753.66M	USD	Point-in-time
Right-of-Use Asset - Operating Leases	`OperatingLeaseRightOfUseAsset`	$16.54M	USD	Point-in-time
Right-of-Use Asset - Operating Leases	`OperatingLeaseRightOfUseAsset`	$7.13M	USD	Point-in-time
Right-of-Use Asset - Finance Leases	`FinanceLeaseRightOfUseAsset`	$129.00K	USD	Point-in-time
Investments, at Equity, and Advances to 50% or Less Owned Companies	`InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures`	$120.83M	USD	Point-in-time
Investments, at Equity, and Advances to 50% or Less Owned Companies	`InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures`	$75.31M	USD	Point-in-time
Construction Reserve Funds	`ConstructionReserveFunds`	$12.89M	USD	Point-in-time
Other Assets	`OtherAssetsNoncurrent`	$2.73M	USD	Point-in-time
Other Assets	`OtherAssetsNoncurrent`	$3.36M	USD	Point-in-time
Total assets	`Assets`	$1.02B	USD	Point-in-time
Total assets	`Assets`	$1.01B	USD	Point-in-time
Current portion of operating lease liabilities	`OperatingLeaseLiabilityCurrent`	$7.03M	USD	Point-in-time
Current portion of operating lease liabilities	`OperatingLeaseLiabilityCurrent`	$14.90M	USD	Point-in-time
Current portion of finance lease liabilities	`FinanceLeaseLiabilityCurrent`	$36.00K	USD	Point-in-time
Recourse	`RecourseLongTermDebtCurrent`	$17.80M	USD	Point-in-time
Recourse	`RecourseLongTermDebtCurrent`	$26.73M	USD	Point-in-time
Non Recourse	`NonRecourseLongTermDebtCurrent`	$5.64M	USD	Point-in-time
Accounts payable and accrued expenses	`AccountsPayableAndAccruedLiabilitiesCurrent`	$24.60M	USD	Point-in-time
Accounts payable and accrued expenses	`AccountsPayableAndAccruedLiabilitiesCurrent`	$29.97M	USD	Point-in-time
Due to SEACOR Holdings	`DueToAffiliateCurrent`	$74.00K	USD	Point-in-time
Accrued wages and benefits	`EmployeeRelatedLiabilitiesCurrent`	$1.74M	USD	Point-in-time
Accrued wages and benefits	`EmployeeRelatedLiabilitiesCurrent`	$1.54M	USD	Point-in-time
Accrued interest	`InterestAndDividendsPayableCurrent`	$1.66M	USD	Point-in-time
Accrued interest	`InterestAndDividendsPayableCurrent`	$729.00K	USD	Point-in-time
Accrued capital, repair and maintenance expenditures	`AccruedCapitalRepairAndMaintenanceExpendituresCurrent`	$11.33M	USD	Point-in-time
Accrued capital, repair and maintenance expenditures	`AccruedCapitalRepairAndMaintenanceExpendituresCurrent`	$15.98M	USD	Point-in-time
Deferred and Unearned revenues	`ContractWithCustomerLiabilityCurrent`	$4.45M	USD	Point-in-time
Deferred and Unearned revenues	`ContractWithCustomerLiabilityCurrent`	$5.30M	USD	Point-in-time
Accrued insurance deductibles and premiums	`AccruedInsuranceCurrent`	$3.56M	USD	Point-in-time
Accrued insurance deductibles and premiums	`AccruedInsuranceCurrent`	$2.27M	USD	Point-in-time
Accrued professional fees	`AccruedProfessionalFeesCurrent`	$871.00K	USD	Point-in-time
Accrued professional fees	`AccruedProfessionalFeesCurrent`	$975.00K	USD	Point-in-time
Derivatives	`DerivativeLiabilitiesCurrent`	$2.92M	USD	Point-in-time
Derivatives	`DerivativeLiabilitiesCurrent`	$4.59M	USD	Point-in-time
Other current liabilities	`OtherLiabilitiesCurrent`	$4.44M	USD	Point-in-time
Other current liabilities	`OtherLiabilitiesCurrent`	$4.48M	USD	Point-in-time
Liabilities associated with assets held for sale	`LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent`	$27.54M	USD	Point-in-time
Liabilities associated with assets held for sale	`LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent`	$30.93M	USD	Point-in-time
Total current liabilities	`LiabilitiesCurrent`	$120.30M	USD	Point-in-time
Total current liabilities	`LiabilitiesCurrent`	$131.80M	USD	Point-in-time
Long-Term Operating Lease Liabilities	`OperatingLeaseLiabilityNoncurrent`	$9.26M	USD	Point-in-time
Long-Term Operating Lease Liabilities	`OperatingLeaseLiabilityNoncurrent`	$4.34M	USD	Point-in-time
Long-Term Finance Lease Liabilities	`FinanceLeaseLiabilityNoncurrent`	$105.00K	USD	Point-in-time
Recourse	`RecourseLongTermDebtNoncurrent`	$239.94M	USD	Point-in-time
Recourse	`RecourseLongTermDebtNoncurrent`	$328.69M	USD	Point-in-time
Non Recourse	`NonRecourseLongTermDebtNoncurrent`	$111.82M	USD	Point-in-time
Non Recourse	`NonRecourseLongTermDebtNoncurrent`	$115.78M	USD	Point-in-time
Conversion Option Liability on Convertible Senior Notes	`DerivativeLiabilitiesNoncurrent`	$2.00K	USD	Point-in-time
Conversion Option Liability on Convertible Senior Notes	`DerivativeLiabilitiesNoncurrent`	$5.21M	USD	Point-in-time
Deferred Income Taxes	`DeferredIncomeTaxLiabilitiesNet`	$35.82M	USD	Point-in-time
Deferred Income Taxes	`DeferredIncomeTaxLiabilitiesNet`	$33.56M	USD	Point-in-time
Deferred Gains and Other Liabilities	`OtherLiabilitiesNoncurrent`	$6.23M	USD	Point-in-time
Deferred Gains and Other Liabilities	`OtherLiabilitiesNoncurrent`	$3.24M	USD	Point-in-time
Total liabilities	`Liabilities`	$530.27M	USD	Point-in-time
Total liabilities	`Liabilities`	$615.83M	USD	Point-in-time
Preferred stock, $.01 par value, 10,000,000 shares authorized; none issued nor outstanding	`PreferredStockValue`	-	USD	Point-in-time
Preferred stock, $.01 par value, 10,000,000 shares authorized; none issued nor outstanding	`PreferredStockValue`	-	USD	Point-in-time
Common stock, $.01 par value, 60,000,000 shares authorized; 23,504,050 and 21,928,674 shares issued in 2020 and 2019, respectively	`CommonStockValue`	$219.00K	USD	Point-in-time
Common stock, $.01 par value, 60,000,000 shares authorized; 23,504,050 and 21,928,674 shares issued in 2020 and 2019, respectively	`CommonStockValue`	$235.00K	USD	Point-in-time
Additional paid-in capital	`AdditionalPaidInCapitalCommonStock`	$451.18M	USD	Point-in-time
Additional paid-in capital	`AdditionalPaidInCapitalCommonStock`	$429.32M	USD	Point-in-time
Retained earnings	`RetainedEarningsAccumulatedDeficit`	$-51.84M	USD	Point-in-time
Retained earnings	`RetainedEarningsAccumulatedDeficit`	$27.08M	USD	Point-in-time
Shares held in treasury of 73,284 and 47,185 in 2020 and 2019, respectively, at cost	`TreasuryStockValue`	$848.00K	USD	Point-in-time
Shares held in treasury of 73,284 and 47,185 in 2020 and 2019, respectively, at cost	`TreasuryStockValue`	$669.00K	USD	Point-in-time
Accumulated other comprehensive loss, net of tax	`AccumulatedOtherComprehensiveIncomeLossNetOfTax`	$1.55M	USD	Point-in-time
Accumulated other comprehensive loss, net of tax	`AccumulatedOtherComprehensiveIncomeLossNetOfTax`	$2.79M	USD	Point-in-time
Total stockholders equity	`StockholdersEquity`	$401.52M	USD	Point-in-time
Total stockholders equity	`StockholdersEquity`	$457.49M	USD	Point-in-time
Noncontrolling interests in subsidiaries	`MinorityInterest`	$21.43M	USD	Point-in-time
Noncontrolling interests in subsidiaries	`MinorityInterest`	$319.00K	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$511.10M	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$478.92M	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$565.35M	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$401.84M	USD	Point-in-time
Total liabilities and equity	`LiabilitiesAndStockholdersEquity`	$1.02B	USD	Point-in-time
Total liabilities and equity	`LiabilitiesAndStockholdersEquity`	$1.01B	USD	Point-in-time

Income Statement 154 line items

Line Item	Tag	Value	Unit	Period
Operating Revenues	`RevenueFromContractWithCustomerIncludingAssessedTax`	$42.48M	USD	1 Quarter
Operating Revenues	`RevenueFromContractWithCustomerIncludingAssessedTax`	$39.97M	USD	1 Quarter
Operating Revenues	`RevenueFromContractWithCustomerIncludingAssessedTax`	$45.01M	USD	1 Quarter
Operating Revenues	`RevenueFromContractWithCustomerIncludingAssessedTax`	$36.20M	USD	1 Quarter
Operating Revenues	`RevenueFromContractWithCustomerIncludingAssessedTax`	$47.00M	USD	1 Quarter
Operating Revenues	`RevenueFromContractWithCustomerIncludingAssessedTax`	$141.84M	USD	Annual
Operating Revenues	`RevenueFromContractWithCustomerIncludingAssessedTax`	$33.92M	USD	1 Quarter
Operating Revenues	`RevenueFromContractWithCustomerIncludingAssessedTax`	$36.04M	USD	1 Quarter
Operating Revenues	`RevenueFromContractWithCustomerIncludingAssessedTax`	$174.45M	USD	Annual
Operating Revenues	`RevenueFromContractWithCustomerIncludingAssessedTax`	$35.67M	USD	1 Quarter
Operating Revenues	`RevenueFromContractWithCustomerIncludingAssessedTax`	$179.16M	USD	Annual
Operating	`OperatingCostsAndExpenses`	$109.52M	USD	Annual
Operating	`OperatingCostsAndExpenses`	$119.59M	USD	Annual
Operating	`OperatingCostsAndExpenses`	$91.14M	USD	Annual
Administrative and general	`GeneralAndAdministrativeExpense`	$40.05M	USD	Annual
Administrative and general	`GeneralAndAdministrativeExpense`	$41.62M	USD	Annual
Administrative and general	`GeneralAndAdministrativeExpense`	$39.79M	USD	Annual
Lease expense	`LeaseExpense`	$15.84M	USD	Annual
Lease expense	`LeaseExpense`	$12.96M	USD	Annual
Lease expense	`LeaseExpense`	$7.53M	USD	Annual
Depreciation and amortization	`DepreciationDepletionAndAmortization`	$57.17M	USD	Annual
Depreciation and amortization	`DepreciationDepletionAndAmortization`	$57.17M	USD	Annual
Depreciation and amortization	`DepreciationDepletionAndAmortization`	$61.42M	USD	Annual
Costs and expenses	`CostsAndExpenses`	$222.32M	USD	Annual
Costs and expenses	`CostsAndExpenses`	$235.59M	USD	Annual
Costs and expenses	`CostsAndExpenses`	$195.89M	USD	Annual
Losses on Asset Dispositions and Impairments, Net	`GainLossOnSalesOfAssetsAndAssetImpairmentCharges`	$-6.46M	USD	Annual
Losses on Asset Dispositions and Impairments, Net	`GainLossOnSalesOfAssetsAndAssetImpairmentCharges`	$-17.59M	USD	Annual
Losses on Asset Dispositions and Impairments, Net	`GainLossOnSalesOfAssetsAndAssetImpairmentCharges`	$-11.99M	USD	Annual
Operating Loss	`OperatingIncomeLoss`	$-23.72M	USD	1 Quarter
Operating Loss	`OperatingIncomeLoss`	$-13.18M	USD	1 Quarter
Operating Loss	`OperatingIncomeLoss`	$-10.55M	USD	1 Quarter
Operating Loss	`OperatingIncomeLoss`	$-71.64M	USD	Annual
Operating Loss	`OperatingIncomeLoss`	$-68.41M	USD	Annual
Operating Loss	`OperatingIncomeLoss`	$-16.91M	USD	1 Quarter
Operating Loss	`OperatingIncomeLoss`	$-5.57M	USD	1 Quarter
Operating Loss	`OperatingIncomeLoss`	$-18.59M	USD	1 Quarter
Operating Loss	`OperatingIncomeLoss`	$-19.62M	USD	1 Quarter
Operating Loss	`OperatingIncomeLoss`	$-17.82M	USD	1 Quarter
Operating Loss	`OperatingIncomeLoss`	$-54.33M	USD	Annual
Interest income	`InvestmentIncomeInterest`	$1.39M	USD	Annual
Interest income	`InvestmentIncomeInterest`	$1.17M	USD	Annual
Interest income	`InvestmentIncomeInterest`	$1.27M	USD	Annual
Interest expense	`InterestExpense`	$28.96M	USD	Annual
Interest expense	`InterestExpense`	$30.69M	USD	Annual
Interest expense	`InterestExpense`	$26.73M	USD	Annual
SEACOR Holdings guarantee fees	`GuaranteeFeesRelatedParty`	$29.00K	USD	Annual
SEACOR Holdings guarantee fees	`GuaranteeFeesRelatedParty`	$47.00K	USD	Annual
SEACOR Holdings guarantee fees	`GuaranteeFeesRelatedParty`	$108.00K	USD	Annual
Loss on Debt Extinguishment	`GainsLossesOnExtinguishmentOfDebt`	$-638.00K	USD	Annual
Derivative gains, net	`GainLossOnDerivativeInstrumentsNetPretax`	$2.85M	USD	Annual
Derivative gains, net	`GainLossOnDerivativeInstrumentsNetPretax`	$4.31M	USD	Annual
Derivative gains, net	`GainLossOnDerivativeInstrumentsNetPretax`	$71.00K	USD	Annual
Foreign currency losses, net	`ForeignCurrencyTransactionGainLossBeforeTax`	$-2.54M	USD	Annual
Foreign currency losses, net	`ForeignCurrencyTransactionGainLossBeforeTax`	$-1.33M	USD	Annual
Foreign currency losses, net	`ForeignCurrencyTransactionGainLossBeforeTax`	$-1.29M	USD	Annual
Other, net	`OtherNonoperatingIncomeExpense`	$-1.00K	USD	Annual
Other, net	`OtherNonoperatingIncomeExpense`	$677.00K	USD	Annual
Other, net	`OtherNonoperatingIncomeExpense`	$-19.00K	USD	Annual
Nonoperating income expense	`NonoperatingIncomeExpense`	$-24.02M	USD	Annual
Nonoperating income expense	`NonoperatingIncomeExpense`	$-26.47M	USD	Annual
Nonoperating income expense	`NonoperatingIncomeExpense`	$-30.15M	USD	Annual
Loss from Continuing Operations Before Tax Benefit and Equity in Losses of 50% or Less Owned Companies	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments`	$-98.11M	USD	Annual
Loss from Continuing Operations Before Tax Benefit and Equity in Losses of 50% or Less Owned Companies	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments`	$-84.47M	USD	Annual
Loss from Continuing Operations Before Tax Benefit and Equity in Losses of 50% or Less Owned Companies	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments`	$-92.43M	USD	Annual
Current	`CurrentIncomeTaxExpenseBenefit`	$4.92M	USD	Annual
Current	`CurrentIncomeTaxExpenseBenefit`	$-25.18M	USD	Annual
Current	`CurrentIncomeTaxExpenseBenefit`	$9.30M	USD	Annual
Deferred	`DeferredIncomeTaxExpenseBenefit`	$2.26M	USD	Annual
Deferred	`DeferredIncomeTaxExpenseBenefit`	$-12.89M	USD	Annual
Deferred	`DeferredIncomeTaxExpenseBenefit`	$-22.76M	USD	Annual
Income Tax (Benefit) Expense	`IncomeTaxExpenseBenefit`	$-22.92M	USD	Annual
Income Tax (Benefit) Expense	`IncomeTaxExpenseBenefit`	$-13.46M	USD	Annual
Income Tax (Benefit) Expense	`IncomeTaxExpenseBenefit`	$-7.97M	USD	Annual
Loss Before Equity in Losses of 50% or Less Owned Companies	`IncomeLossFromContinuingOperationsBeforeEquityMethodInvestmentsAndNoncontrollingInterestAfterTax`	$-75.18M	USD	Annual
Loss Before Equity in Losses of 50% or Less Owned Companies	`IncomeLossFromContinuingOperationsBeforeEquityMethodInvestmentsAndNoncontrollingInterestAfterTax`	$-78.97M	USD	Annual
Loss Before Equity in Losses of 50% or Less Owned Companies	`IncomeLossFromContinuingOperationsBeforeEquityMethodInvestmentsAndNoncontrollingInterestAfterTax`	$-76.50M	USD	Annual
Equity in Losses of 50% or Less Owned Companies, Net of Tax	`IncomeLossFromEquityMethodInvestments`	$-4.01M	USD	Annual
Equity in Losses of 50% or Less Owned Companies, Net of Tax	`IncomeLossFromEquityMethodInvestments`	$-8.16M	USD	Annual
Equity in Losses of 50% or Less Owned Companies, Net of Tax	`IncomeLossFromEquityMethodInvestments`	$-14.46M	USD	Annual
Loss from Continuing Operations	`IncomeLossFromContinuingOperations`	$-82.98M	USD	Annual
Loss from Continuing Operations	`IncomeLossFromContinuingOperations`	$-17.94M	USD	1 Quarter
Loss from Continuing Operations	`IncomeLossFromContinuingOperations`	$-12.59M	USD	1 Quarter
Loss from Continuing Operations	`IncomeLossFromContinuingOperations`	$-90.96M	USD	Annual
Loss from Continuing Operations	`IncomeLossFromContinuingOperations`	$-27.31M	USD	1 Quarter
Loss from Continuing Operations	`IncomeLossFromContinuingOperations`	$-31.63M	USD	1 Quarter
Loss from Continuing Operations	`IncomeLossFromContinuingOperations`	$-19.44M	USD	1 Quarter
Loss from Continuing Operations	`IncomeLossFromContinuingOperations`	$-6.67M	USD	1 Quarter
Loss from Continuing Operations	`IncomeLossFromContinuingOperations`	$-38.90M	USD	1 Quarter
Loss from Continuing Operations	`IncomeLossFromContinuingOperations`	$-19.84M	USD	1 Quarter
Loss from Continuing Operations	`IncomeLossFromContinuingOperations`	$-83.35M	USD	Annual
Income (Loss) on Discontinued Operations, Net of Tax	`IncomeLossFromDiscontinuedOperationsNetOfTax`	$927.00K	USD	Annual
Income (Loss) on Discontinued Operations, Net of Tax	`IncomeLossFromDiscontinuedOperationsNetOfTax`	$-7.73M	USD	Annual
Income (Loss) on Discontinued Operations, Net of Tax	`IncomeLossFromDiscontinuedOperationsNetOfTax`	$364.00K	USD	Annual
Net Loss	`ProfitLoss`	$-18.24M	USD	1 Quarter
Net Loss	`ProfitLoss`	$-38.85M	USD	1 Quarter
Net Loss	`ProfitLoss`	$-30.26M	USD	1 Quarter
Net Loss	`ProfitLoss`	$-6.07M	USD	1 Quarter
Net Loss	`ProfitLoss`	$-82.98M	USD	Annual
Net Loss	`ProfitLoss`	$-82.05M	USD	Annual
Net Loss	`ProfitLoss`	$-98.69M	USD	Annual
Net Loss	`ProfitLoss`	$-28.27M	USD	1 Quarter
Net Loss	`ProfitLoss`	$-21.92M	USD	1 Quarter
Net Loss	`ProfitLoss`	$-19.99M	USD	1 Quarter
Net Loss	`ProfitLoss`	$-18.08M	USD	1 Quarter
Net Loss attributable to Noncontrolling Interests in Subsidiaries	`NetIncomeLossAttributableToNoncontrollingInterest`	$-4.44M	USD	Annual
Net Loss attributable to Noncontrolling Interests in Subsidiaries	`NetIncomeLossAttributableToNoncontrollingInterest`	$-5.86M	USD	Annual
Net Loss attributable to Noncontrolling Interests in Subsidiaries	`NetIncomeLossAttributableToNoncontrollingInterest`	$-4.07M	USD	Annual
Net Loss attributable to SEACOR Marine Holdings Inc.	`NetIncomeLoss`	$-15.95M	USD	1 Quarter
Net Loss attributable to SEACOR Marine Holdings Inc.	`NetIncomeLoss`	$-28.39M	USD	1 Quarter
Net Loss attributable to SEACOR Marine Holdings Inc.	`NetIncomeLoss`	$-18.44M	USD	1 Quarter
Net Loss attributable to SEACOR Marine Holdings Inc.	`NetIncomeLoss`	$-77.61M	USD	Annual
Net Loss attributable to SEACOR Marine Holdings Inc.	`NetIncomeLoss`	$-6.07M	USD	1 Quarter
Net Loss attributable to SEACOR Marine Holdings Inc.	`NetIncomeLoss`	$-18.08M	USD	1 Quarter
Net Loss attributable to SEACOR Marine Holdings Inc.	`NetIncomeLoss`	$-38.82M	USD	1 Quarter
Net Loss attributable to SEACOR Marine Holdings Inc.	`NetIncomeLoss`	$-92.84M	USD	Annual
Net Loss attributable to SEACOR Marine Holdings Inc.	`NetIncomeLoss`	$-25.55M	USD	1 Quarter
Net Loss attributable to SEACOR Marine Holdings Inc.	`NetIncomeLoss`	$-78.92M	USD	Annual
Net Loss attributable to SEACOR Marine Holdings Inc.	`NetIncomeLoss`	$-20.45M	USD	1 Quarter
Continuing operations	`IncomeLossFromContinuingOperationsPerBasicAndDilutedShare`	$-0.79	USD	1 Quarter
Continuing operations	`IncomeLossFromContinuingOperationsPerBasicAndDilutedShare`	$-1.27	USD	1 Quarter
Continuing operations	`IncomeLossFromContinuingOperationsPerBasicAndDilutedShare`	$-0.26	USD	1 Quarter
Continuing operations	`IncomeLossFromContinuingOperationsPerBasicAndDilutedShare`	$-0.54	USD	1 Quarter
Continuing operations	`IncomeLossFromContinuingOperationsPerBasicAndDilutedShare`	$-1.54	USD	1 Quarter
Continuing operations	`IncomeLossFromContinuingOperationsPerBasicAndDilutedShare`	$-0.76	USD	1 Quarter
Continuing operations	`IncomeLossFromContinuingOperationsPerBasicAndDilutedShare`	$-3.62	USD	Annual
Continuing operations	`IncomeLossFromContinuingOperationsPerBasicAndDilutedShare`	$-0.58	USD	1 Quarter
Continuing operations	`IncomeLossFromContinuingOperationsPerBasicAndDilutedShare`	$-3.74	USD	Annual
Continuing operations	`IncomeLossFromContinuingOperationsPerBasicAndDilutedShare`	$-3.20	USD	Annual
Continuing operations	`IncomeLossFromContinuingOperationsPerBasicAndDilutedShare`	$-1.07	USD	1 Quarter
Discontinued operations	`IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare`	$0.04	USD	Annual
Discontinued operations	`IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare`	$0.06	USD	1 Quarter
Discontinued operations	`IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare`	$-0.04	USD	1 Quarter
Discontinued operations	`IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare`	$0.02	USD	Annual
Discontinued operations	`IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare`	$-0.08	USD	1 Quarter
Discontinued operations	`IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare`	$0.02	USD	1 Quarter
Discontinued operations	`IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare`	$-0.10	USD	1 Quarter
Discontinued operations	`IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare`	$0.07	USD	1 Quarter
Discontinued operations	`IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare`	$-0.24	USD	1 Quarter
Discontinued operations	`IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare`	$-0.33	USD	Annual
Basic and Diluted Income (Loss) Per Common Share and Warrants	`EarningsPerShareBasicAndDiluted`	$-0.86	USD	1 Quarter
Basic and Diluted Income (Loss) Per Common Share and Warrants	`EarningsPerShareBasicAndDiluted`	$-0.24	USD	1 Quarter
Basic and Diluted Income (Loss) Per Common Share and Warrants	`EarningsPerShareBasicAndDiluted`	$-0.72	USD	1 Quarter
Basic and Diluted Income (Loss) Per Common Share and Warrants	`EarningsPerShareBasicAndDiluted`	$-1.11	USD	1 Quarter
Basic and Diluted Income (Loss) Per Common Share and Warrants	`EarningsPerShareBasicAndDiluted`	$-0.78	USD	1 Quarter
Basic and Diluted Income (Loss) Per Common Share and Warrants	`EarningsPerShareBasicAndDiluted`	$-1.54	USD	1 Quarter
Basic and Diluted Income (Loss) Per Common Share and Warrants	`EarningsPerShareBasicAndDiluted`	$-0.66	USD	1 Quarter
Basic and Diluted Income (Loss) Per Common Share and Warrants	`EarningsPerShareBasicAndDiluted`	$-3.70	USD	Annual
Basic and Diluted Income (Loss) Per Common Share and Warrants	`EarningsPerShareBasicAndDiluted`	$-1.21	USD	1 Quarter
Basic and Diluted Income (Loss) Per Common Share and Warrants	`EarningsPerShareBasicAndDiluted`	$-3.95	USD	Annual
Basic and Diluted Income (Loss) Per Common Share and Warrants	`EarningsPerShareBasicAndDiluted`	$-3.18	USD	Annual
Basic and diluted shares	`WeightedAverageNumberOfShareOutstandingBasicAndDiluted`	20.93M	shares	Annual
Basic and diluted shares	`WeightedAverageNumberOfShareOutstandingBasicAndDiluted`	23.51M	shares	Annual
Basic and diluted shares	`WeightedAverageNumberOfShareOutstandingBasicAndDiluted`	24.79M	shares	Annual

Cash Flow Statement 143 line items

Line Item	Tag	Value	Unit	Period
Net Loss	`IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest`	$100.07M	USD	Annual
Net Loss	`IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest`	$82.98M	USD	Annual
Net Loss	`IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest`	$83.35M	USD	Annual
Depreciation and amortization	`DepreciationDepletionAndAmortization`	$57.17M	USD	Annual
Depreciation and amortization	`DepreciationDepletionAndAmortization`	$57.17M	USD	Annual
Depreciation and amortization	`DepreciationDepletionAndAmortization`	$61.42M	USD	Annual
Deferred financing cost amortization	`AmortizationOfFinancingCosts`	$1.11M	USD	Annual
Deferred financing cost amortization	`AmortizationOfFinancingCosts`	$1.05M	USD	Annual
Deferred financing cost amortization	`AmortizationOfFinancingCosts`	$1.89M	USD	Annual
Amortization of deferred gains against charter expense	`SaleLeasebackTransactionCurrentPeriodGainRecognized`	$8.04M	USD	Annual
Amortization of employee share awards	`EmployeeBenefitsAndShareBasedCompensation`	$3.49M	USD	Annual
Amortization of employee share awards	`EmployeeBenefitsAndShareBasedCompensation`	$4.07M	USD	Annual
Amortization of employee share awards	`EmployeeBenefitsAndShareBasedCompensation`	$5.05M	USD	Annual
Restricted stock vesting	`RestrictedStockVesting`	$88.00K	USD	Annual
Restricted stock vesting	`RestrictedStockVesting`	$577.00K	USD	Annual
Restricted stock vesting	`RestrictedStockVesting`	$178.00K	USD	Annual
Director share awards	`DirectorStockAwards`	$755.00K	USD	Annual
Director share awards	`DirectorStockAwards`	$893.00K	USD	Annual
Director share awards	`DirectorStockAwards`	$894.00K	USD	Annual
Debt discount amortization	`AmortizationOfDebtDiscountPremium`	$5.35M	USD	Annual
Debt discount amortization	`AmortizationOfDebtDiscountPremium`	$6.67M	USD	Annual
Debt discount amortization	`AmortizationOfDebtDiscountPremium`	$5.66M	USD	Annual
Provision for expected credit losses	`ProvisionForDoubtfulAccounts`	$-404.00K	USD	Annual
Provision for expected credit losses	`ProvisionForDoubtfulAccounts`	$230.00K	USD	Annual
Provision for expected credit losses	`ProvisionForDoubtfulAccounts`	$-880.00K	USD	Annual
Losses from equipment sales, retirements or impairments	`GainLossOnSalesOfAssetsAndAssetImpairmentCharges`	$-6.46M	USD	Annual
Losses from equipment sales, retirements or impairments	`GainLossOnSalesOfAssetsAndAssetImpairmentCharges`	$-17.59M	USD	Annual
Losses from equipment sales, retirements or impairments	`GainLossOnSalesOfAssetsAndAssetImpairmentCharges`	$-11.99M	USD	Annual
Loss from sale of Boston Putford Offshore Safety	`GainLossOnDispositionOfAssets1`	$-9.11M	USD	Annual
Gain from other sales	`GainLossOnSaleOfOtherAssets`	$428.00K	USD	Annual
Derivative gains	`GainLossOnDerivativeInstrumentsNetPretax`	$2.85M	USD	Annual
Derivative gains	`GainLossOnDerivativeInstrumentsNetPretax`	$4.31M	USD	Annual
Derivative gains	`GainLossOnDerivativeInstrumentsNetPretax`	$71.00K	USD	Annual
Cash settlement payments on derivative transactions, net	`PaymentsForProceedsFromDerivativeInstrumentsOperatingActivities`	$1.33M	USD	Annual
Cash settlement payments on derivative transactions, net	`PaymentsForProceedsFromDerivativeInstrumentsOperatingActivities`	$482.00K	USD	Annual
Cash settlement payments on derivative transactions, net	`PaymentsForProceedsFromDerivativeInstrumentsOperatingActivities`	$-1.41M	USD	Annual
Currency losses	`ForeignCurrencyTransactionGainLossBeforeTax`	$-2.54M	USD	Annual
Currency losses	`ForeignCurrencyTransactionGainLossBeforeTax`	$-1.33M	USD	Annual
Currency losses	`ForeignCurrencyTransactionGainLossBeforeTax`	$-1.29M	USD	Annual
Deferred	`DeferredIncomeTaxExpenseBenefit`	$2.26M	USD	Annual
Deferred	`DeferredIncomeTaxExpenseBenefit`	$-12.89M	USD	Annual
Deferred	`DeferredIncomeTaxExpenseBenefit`	$-22.76M	USD	Annual
Equity losses	`IncomeLossFromEquityMethodInvestments`	$-4.01M	USD	Annual
Equity losses	`IncomeLossFromEquityMethodInvestments`	$-8.16M	USD	Annual
Equity losses	`IncomeLossFromEquityMethodInvestments`	$-14.46M	USD	Annual
Dividends received from equity investees	`ProceedsFromDividendsReceived`	$2.12M	USD	Annual
Dividends received from equity investees	`ProceedsFromDividendsReceived`	$1.72M	USD	Annual
Dividends received from equity investees	`ProceedsFromDividendsReceived`	$2.07M	USD	Annual
Accounts Receivables	`IncreaseDecreaseInReceivables`	$30.16M	USD	Annual
Accounts Receivables	`IncreaseDecreaseInReceivables`	$18.73M	USD	Annual
Accounts Receivables	`IncreaseDecreaseInReceivables`	$-10.18M	USD	Annual
Other Assets	`IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets`	$-6.53M	USD	Annual
Other Assets	`IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets`	$-925.00K	USD	Annual
Other Assets	`IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets`	$-554.00K	USD	Annual
Accounts payable and accrued liabilities	`IncreaseDecreaseInAccountsPayableAndAccruedLiabilities`	$-18.34M	USD	Annual
Accounts payable and accrued liabilities	`IncreaseDecreaseInAccountsPayableAndAccruedLiabilities`	$-21.25M	USD	Annual
Accounts payable and accrued liabilities	`IncreaseDecreaseInAccountsPayableAndAccruedLiabilities`	$957.00K	USD	Annual
Net cash (used in) provided by operating activities	`NetCashProvidedByUsedInOperatingActivitiesContinuingOperations`	$-63.59M	USD	Annual
Net cash (used in) provided by operating activities	`NetCashProvidedByUsedInOperatingActivitiesContinuingOperations`	$1.66M	USD	Annual
Net cash (used in) provided by operating activities	`NetCashProvidedByUsedInOperatingActivitiesContinuingOperations`	$-29.72M	USD	Annual
Purchases of property and equipment	`PaymentsToAcquirePropertyPlantAndEquipment`	$44.77M	USD	Annual
Purchases of property and equipment	`PaymentsToAcquirePropertyPlantAndEquipment`	$20.81M	USD	Annual
Purchases of property and equipment	`PaymentsToAcquirePropertyPlantAndEquipment`	$35.65M	USD	Annual
Proceeds from disposition of property and equipment	`ProceedsFromSaleOfPropertyPlantAndEquipment`	$10.65M	USD	Annual
Proceeds from disposition of property and equipment	`ProceedsFromSaleOfPropertyPlantAndEquipment`	$55.32M	USD	Annual
Proceeds from disposition of property and equipment	`ProceedsFromSaleOfPropertyPlantAndEquipment`	$20.67M	USD	Annual
Cash impact of sale of ERRV fleet	`PaymentsForProceedsFromCashImpactOfSaleOfERRVFleet`	$5.14M	USD	Annual
Purchase of subsidiary from joint venture	`PaymentsToAcquireProceedsFromDivestitureInterestInJointVenture`	$8.45M	USD	Annual
Purchase of subsidiary from joint venture	`PaymentsToAcquireProceedsFromDivestitureInterestInJointVenture`	$-8.02M	USD	Annual
Investments in and advances to 50% or less owned companies	`PaymentsToAcquireEquityMethodInvestments`	$17.39M	USD	Annual
Investments in and advances to 50% or less owned companies	`PaymentsToAcquireEquityMethodInvestments`	$2.21M	USD	Annual
Investments in and advances to 50% or less owned companies	`PaymentsToAcquireEquityMethodInvestments`	$43.39M	USD	Annual
Return of investments and advances from 50% or less owned companies	`ProceedsFromInvestmentsDistributionReturnOfCapital`	$461.00K	USD	Annual
Return of investments and advances from 50% or less owned companies	`ProceedsFromInvestmentsDistributionReturnOfCapital`	$16.26M	USD	Annual
Construction reserve funds transferred to short-term cash	`ConstructionReserveFundsTransferredToShortTermCash`	$3.75M	USD	Annual
Construction reserve funds utilized	`PaymentsForProceedsFromOtherInvestingActivities`	$-9.15M	USD	Annual
Construction reserve funds utilized	`PaymentsForProceedsFromOtherInvestingActivities`	$-17.30M	USD	Annual
Construction reserve funds utilized	`PaymentsForProceedsFromOtherInvestingActivities`	$-15.17M	USD	Annual
Principal payments on notes due from equity investees	`RepaymentOfNotesReceivableFromRelatedParties`	$1.72M	USD	Annual
Net cash provided by (used in) investing activities	`NetCashProvidedByUsedInInvestingActivitiesContinuingOperations`	$31.03M	USD	Annual
Net cash provided by (used in) investing activities	`NetCashProvidedByUsedInInvestingActivitiesContinuingOperations`	$3.82M	USD	Annual
Net cash provided by (used in) investing activities	`NetCashProvidedByUsedInInvestingActivitiesContinuingOperations`	$-26.80M	USD	Annual
Payments on long-term debt	`RepaymentsOfLongTermDebt`	$23.97M	USD	Annual
Payments on long-term debt	`RepaymentsOfLongTermDebt`	$22.60M	USD	Annual
Payments on long-term debt	`RepaymentsOfLongTermDebt`	$41.93M	USD	Annual
Proceeds from issuance of long-term debt	`ProceedsFromIssuanceOfLongTermDebt`	$53.55M	USD	Annual
Proceeds from exercise of stock options and warrants	`ProceedsFromStockOptionsAndWarrantsExercised`	$2.00K	USD	Annual
Proceeds from exercise of stock options and warrants	`ProceedsFromStockOptionsAndWarrantsExercised`	$1.42M	USD	Annual
Proceeds from exercise of stock options and warrants	`ProceedsFromStockOptionsAndWarrantsExercised`	$833.00K	USD	Annual
Interest on Finance Leases	`ProceedsFromInterestOnFinanceLeases`	$1.00K	USD	Annual
Issuance of stock	`ProceedsFromIssuanceOfCommonStock`	$43.00M	USD	Annual
Issuance of warrants	`ProceedsFromIssuanceOfWarrants`	$12.81M	USD	Annual
Purchase of subsidiary shares from noncontrolling interests	`PaymentToSubsidiarySharesFromNoncontrollingInterests`	$3.39M	USD	Annual
Net cash (used in) provided by financing activities	`NetCashProvidedByUsedInFinancingActivitiesContinuingOperations`	$68.25M	USD	Annual
Net cash (used in) provided by financing activities	`NetCashProvidedByUsedInFinancingActivitiesContinuingOperations`	$-22.60M	USD	Annual
Net cash (used in) provided by financing activities	`NetCashProvidedByUsedInFinancingActivitiesContinuingOperations`	$-25.94M	USD	Annual
Effects of Exchange Rate Changes on Cash, Cash Equivalents and Restricted Cash	`EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$30.00K	USD	Annual
Effects of Exchange Rate Changes on Cash, Cash Equivalents and Restricted Cash	`EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$299.00K	USD	Annual
Effects of Exchange Rate Changes on Cash, Cash Equivalents and Restricted Cash	`EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$-16.62M	USD	Annual
Net Decrease in Cash, Cash Equivalents and Restricted Cash, Continuing Operations	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseContinuingOperationsIncludingExchangeRateEffect`	$-9.87M	USD	Annual
Net Decrease in Cash, Cash Equivalents and Restricted Cash, Continuing Operations	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseContinuingOperationsIncludingExchangeRateEffect`	$-21.84M	USD	Annual
Net Decrease in Cash, Cash Equivalents and Restricted Cash, Continuing Operations	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseContinuingOperationsIncludingExchangeRateEffect`	$-48.47M	USD	Annual
Operating Activities	`CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations`	$8.22M	USD	Annual
Operating Activities	`CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations`	$10.57M	USD	Annual
Operating Activities	`CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations`	$13.78M	USD	Annual
Investing Activities	`CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations`	$-8.32M	USD	Annual
Investing Activities	`CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations`	$-15.39M	USD	Annual
Investing Activities	`CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations`	$-4.35M	USD	Annual
Financing Activities	`CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations`	$998.00K	USD	Annual
Financing Activities	`CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations`	$941.00K	USD	Annual
Financing Activities	`CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations`	-	USD	Annual
Effects of Exchange Rate Changes on Cash, Restricted Cash and Cash Equivalents	`EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsDisposalGroupIncludingDiscontinuedOperations`	$1.67M	USD	Annual
Effects of Exchange Rate Changes on Cash, Restricted Cash and Cash Equivalents	`EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsDisposalGroupIncludingDiscontinuedOperations`	$119.00K	USD	Annual
Effects of Exchange Rate Changes on Cash, Restricted Cash and Cash Equivalents	`EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsDisposalGroupIncludingDiscontinuedOperations`	$-1.07M	USD	Annual
Net Increase in Cash, Restricted Cash and Cash Equivalents on Discontinued Operations	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseDiscontinuedOperationsIncludingExchangeRateEffect`	$64.00K	USD	Annual
Net Increase in Cash, Restricted Cash and Cash Equivalents on Discontinued Operations	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseDiscontinuedOperationsIncludingExchangeRateEffect`	$6.14M	USD	Annual
Net Increase in Cash, Restricted Cash and Cash Equivalents on Discontinued Operations	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseDiscontinuedOperationsIncludingExchangeRateEffect`	$959.00K	USD	Annual
Net Decrease in Cash, Cash Equivalents and Restricted Cash	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect`	$-9.80M	USD	Annual
Net Decrease in Cash, Cash Equivalents and Restricted Cash	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect`	$-15.70M	USD	Annual
Net Decrease in Cash, Cash Equivalents and Restricted Cash	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect`	$-47.51M	USD	Annual
Cash, Cash Equivalents and Restricted Cash, Beginning of Year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$112.55M	USD	Point-in-time
Cash, Cash Equivalents and Restricted Cash, Beginning of Year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$96.85M	USD	Point-in-time
Cash, Cash Equivalents and Restricted Cash, Beginning of Year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$39.54M	USD	Point-in-time
Cash, Cash Equivalents and Restricted Cash, Beginning of Year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$87.05M	USD	Point-in-time
Cash, Cash Equivalents and Restricted Cash, End of Year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$112.55M	USD	Point-in-time
Cash, Cash Equivalents and Restricted Cash, End of Year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$96.85M	USD	Point-in-time
Cash, Cash Equivalents and Restricted Cash, End of Year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$39.54M	USD	Point-in-time
Cash, Cash Equivalents and Restricted Cash, End of Year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$87.05M	USD	Point-in-time
Cash paid for interest, excluding capitalized interest	`InterestPaidNet`	$21.48M	USD	Annual
Cash paid for interest, excluding capitalized interest	`InterestPaidNet`	$21.98M	USD	Annual
Cash paid for interest, excluding capitalized interest	`InterestPaidNet`	$20.01M	USD	Annual
Income taxes refunded, net	`IncomeTaxesPaidNet`	$2.00M	USD	Annual
Income taxes refunded, net	`IncomeTaxesPaidNet`	$1.09M	USD	Annual
Income taxes refunded, net	`IncomeTaxesPaidNet`	$321.00K	USD	Annual
Increase in property, plant and equipment related to an acquisition	`NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1`	$142.28M	USD	Annual
Increase in property, plant and equipment related to an acquisition	`NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1`	$140.26M	USD	Annual
Decrease in joint venture investments related to an acquisition	`NoncashDecreaseInJointVentureInvestmentsRelatedToAcquisition`	$22.22M	USD	Annual
Increase in long-term debt related to an acquisition	`NoncashOrPartNoncashAcquisitionDebtAssumed1`	$75.57M	USD	Annual
Increase in long-term debt related to an acquisition	`NoncashOrPartNoncashAcquisitionDebtAssumed1`	$106.64M	USD	Annual
Increase in long-term debt related to asset purchases	`NoncashIncreaseInLongTermDebtRelatedToAssetPurchases`	$21.25M	USD	Annual
Increase in long-term debt related to asset purchases	`NoncashIncreaseInLongTermDebtRelatedToAssetPurchases`	$10.63M	USD	Annual
Increase in capital expenditures in accounts payable and accrued liabilities	`IncreaseDecreaseInCapitalExpendituresInAccountsPayableAndAccruedLiabilities`	$2.41M	USD	Annual
Increase in capital expenditures in accounts payable and accrued liabilities	`IncreaseDecreaseInCapitalExpendituresInAccountsPayableAndAccruedLiabilities`	$3.19M	USD	Annual

Stockholders Equity 52 line items

Line Item	Tag	Value	Unit	Period
Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$511.10M	USD	Point-in-time
Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$478.92M	USD	Point-in-time
Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$565.35M	USD	Point-in-time
Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$401.84M	USD	Point-in-time
Balance (in shares)	`CommonStockSharesIssued`	21.93M	shares	Point-in-time
Balance (in shares)	`CommonStockSharesIssued`	23.50M	shares	Point-in-time
Issuance of Common Stock	`StockIssuedDuringPeriodValueNewIssues`	$6.60M	USD	Annual
Issuance of Common Stock	`StockIssuedDuringPeriodValueNewIssues`	$43.00M	USD	Annual
Issuance of Warrants	`AdjustmentsToAdditionalPaidInCapitalWarrantIssued`	$62.81M	USD	Annual
Restricted stock grants	`StockIssuedDuringPeriodValueRestrictedStockAwardGross`	$3.00K	USD	Annual
Restricted stock grants	`StockIssuedDuringPeriodValueRestrictedStockAwardGross`	$2.00K	USD	Annual
Cancellation of grants and options	`AdjustmentToAdditionalPaidInCapitalValueCancellationOfGrantsAndOptions`	$101.00K	USD	Annual
Amortization of employee share awards	`AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue`	$5.05M	USD	Annual
Amortization of employee share awards	`AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue`	$3.49M	USD	Annual
Amortization of employee share awards	`AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue`	$3.97M	USD	Annual
Exercise of options	`StockIssuedDuringPeriodValueStockOptionsExercised`	$1.42M	USD	Annual
Exercise of options	`StockIssuedDuringPeriodValueStockOptionsExercised`	$833.00K	USD	Annual
Exercise of options (in shares)	`StockIssuedDuringPeriodSharesStockOptionsExercised`	113,750.00	shares	Annual
Exercise of options (in shares)	`StockIssuedDuringPeriodSharesStockOptionsExercised`	0.00	shares	Annual
Exercise of Warrants	`StockRepurchasedDuringPeriodValueExerciseOfWarrants`	$2.00K	USD	Annual
Exercise of Warrants	`StockRepurchasedDuringPeriodValueExerciseOfWarrants`	$3.00K	USD	Annual
Restricted stock vesting	`TreasuryStockValueAcquiredCostMethod`	$178.00K	USD	Annual
Restricted stock vesting	`TreasuryStockValueAcquiredCostMethod`	$88.00K	USD	Annual
Restricted stock vesting	`TreasuryStockValueAcquiredCostMethod`	$579.00K	USD	Annual
Director share awards	`StockIssuedDuringPeriodValueIssuedForServices`	$893.00K	USD	Annual
Director share awards	`StockIssuedDuringPeriodValueIssuedForServices`	$755.00K	USD	Annual
Director share awards	`StockIssuedDuringPeriodValueIssuedForServices`	$894.00K	USD	Annual
Acquisition of consolidated joint venture	`StockGrantedDuringPeriodValueSharebasedCompensation`	$2.11M	USD	Annual
Acquisition of consolidated joint venture	`StockGrantedDuringPeriodValueSharebasedCompensation`	$12.04K	USD	Annual
Sale of Standby Safety Fleet	`SaleOfStandbySafetyFleet`	$17.40M	USD	Annual
Dissolution of an entity	`DissolutionOfEntity`	$62.00K	USD	Annual
Issuance of noncontrolling interests	`NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance`	$31.01M	USD	Annual
Net Loss	`ProfitLoss`	$-18.24M	USD	1 Quarter
Net Loss	`ProfitLoss`	$-38.85M	USD	1 Quarter
Net Loss	`ProfitLoss`	$-30.26M	USD	1 Quarter
Net Loss	`ProfitLoss`	$-6.07M	USD	1 Quarter
Net Loss	`ProfitLoss`	$-82.98M	USD	Annual
Net Loss	`ProfitLoss`	$-82.05M	USD	Annual
Net Loss	`ProfitLoss`	$-98.69M	USD	Annual
Net Loss	`ProfitLoss`	$-28.27M	USD	1 Quarter
Net Loss	`ProfitLoss`	$-21.92M	USD	1 Quarter
Net Loss	`ProfitLoss`	$-19.99M	USD	1 Quarter
Net Loss	`ProfitLoss`	$-18.08M	USD	1 Quarter
Other comprehensive (income) loss	`OtherComprehensiveIncomeLossNetOfTax`	$18.34M	USD	Annual
Other comprehensive (income) loss	`OtherComprehensiveIncomeLossNetOfTax`	$1.24M	USD	Annual
Other comprehensive (income) loss	`OtherComprehensiveIncomeLossNetOfTax`	$-4.39M	USD	Annual
Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$511.10M	USD	Point-in-time
Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$478.92M	USD	Point-in-time
Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$565.35M	USD	Point-in-time
Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$401.84M	USD	Point-in-time
Balance (in shares)	`CommonStockSharesIssued`	21.93M	shares	Point-in-time
Balance (in shares)	`CommonStockSharesIssued`	23.50M	shares	Point-in-time

Comprehensive Income 37 line items

Line Item	Tag	Value	Unit	Period
Reclassification of derivative losses on cash flow hedges to equity in losses	`PercentageOfOwnedCompaniesDerivativeLossesOnCashFlowHedgesReclassificationToEquityInEarnings`	0.50	pure	Annual
Reclassification of derivative losses on cash flow hedges to equity in losses	`PercentageOfOwnedCompaniesDerivativeLossesOnCashFlowHedgesReclassificationToEquityInEarnings`	0.50	pure	Annual
Reclassification of derivative losses on cash flow hedges to equity in losses	`PercentageOfOwnedCompaniesDerivativeLossesOnCashFlowHedgesReclassificationToEquityInEarnings`	0.50	pure	Annual
Net Loss	`ProfitLoss`	$-18.24M	USD	1 Quarter
Net Loss	`ProfitLoss`	$-38.85M	USD	1 Quarter
Net Loss	`ProfitLoss`	$-30.26M	USD	1 Quarter
Net Loss	`ProfitLoss`	$-6.07M	USD	1 Quarter
Net Loss	`ProfitLoss`	$-82.98M	USD	Annual
Net Loss	`ProfitLoss`	$-82.05M	USD	Annual
Net Loss	`ProfitLoss`	$-98.69M	USD	Annual
Net Loss	`ProfitLoss`	$-28.27M	USD	1 Quarter
Net Loss	`ProfitLoss`	$-21.92M	USD	1 Quarter
Net Loss	`ProfitLoss`	$-19.99M	USD	1 Quarter
Net Loss	`ProfitLoss`	$-18.08M	USD	1 Quarter
Foreign currency translation gains (losses), net	`OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax`	$-2.37M	USD	Annual
Foreign currency translation gains (losses), net	`OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax`	$2.11M	USD	Annual
Foreign currency translation gains (losses), net	`OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax`	$20.16M	USD	Annual
Derivative losses on cash flow hedges	`OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax`	$-1.90M	USD	Annual
Derivative losses on cash flow hedges	`OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax`	$-2.14M	USD	Annual
Derivative losses on cash flow hedges	`OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax`	$-1.94M	USD	Annual
Other comprehensive income	`OtherComprehensiveIncomeLossBeforeTax`	$-4.35M	USD	Annual
Other comprehensive income	`OtherComprehensiveIncomeLossBeforeTax`	$1.24M	USD	Annual
Other comprehensive income	`OtherComprehensiveIncomeLossBeforeTax`	$18.16M	USD	Annual
Income tax benefit (expense)	`OtherComprehensiveIncomeLossTax`	$-173.00K	USD	Annual
Income tax benefit (expense)	`OtherComprehensiveIncomeLossTax`	$46.00K	USD	Annual
Other comprehensive income, net	`OtherComprehensiveIncomeLossNetOfTax`	$18.34M	USD	Annual
Other comprehensive income, net	`OtherComprehensiveIncomeLossNetOfTax`	$1.24M	USD	Annual
Other comprehensive income, net	`OtherComprehensiveIncomeLossNetOfTax`	$-4.39M	USD	Annual
Comprehensive Loss	`ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest`	$-86.45M	USD	Annual
Comprehensive Loss	`ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest`	$-80.36M	USD	Annual
Comprehensive Loss	`ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest`	$-81.74M	USD	Annual
Comprehensive Loss attributable to Noncontrolling Interests in Subsidiaries	`ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest`	$-4.54M	USD	Annual
Comprehensive Loss attributable to Noncontrolling Interests in Subsidiaries	`ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest`	$-5.86M	USD	Annual
Comprehensive Loss attributable to Noncontrolling Interests in Subsidiaries	`ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest`	$-4.07M	USD	Annual
Comprehensive Loss attributable to SEACOR Marine Holdings Inc.	`ComprehensiveIncomeNetOfTax`	$-77.67M	USD	Annual
Comprehensive Loss attributable to SEACOR Marine Holdings Inc.	`ComprehensiveIncomeNetOfTax`	$-74.50M	USD	Annual
Comprehensive Loss attributable to SEACOR Marine Holdings Inc.	`ComprehensiveIncomeNetOfTax`	$-81.90M	USD	Annual

Data is extracted from SEC EDGAR XBRL filings. Values shown are as reported in the filing.