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Deferred Income and Revenue Participation Rights - Additional Information (Detail) (USD $)	0 Months Ended	3 Months Ended	1 Months Ended
	Mar. 11, 2015	Mar. 31, 2015	Feb. 28, 2011	Dec. 31, 2014	Mar. 31, 2013
Deferred Revenue Arrangement [Line Items]
Deferred income from revenue participation rights		$ 4,643,750us-gaap_DeferredRevenueNoncurrent		$ 4,643,750us-gaap_DeferredRevenueNoncurrent
Revenue participation agreement		15,000,000omex_RevenueParticipationAgreementValue
Promissory note face amount		9,955,000us-gaap_ConvertibleNotesPayable
Oceanica Call Option [Member]
Deferred Revenue Arrangement [Line Items]
Stock granted during period, value	40,000,000omex_StockGrantedValueUponConversionOfConvertibleSecurities / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_CallOptionMember	40,000,000omex_StockGrantedValueUponConversionOfConvertibleSecurities / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_CallOptionMember
Stock granted during period, percentage	54.00%omex_StockGrantedPercentageUponConversionOfConvertibleSecurities / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_CallOptionMember	54.00%omex_StockGrantedPercentageUponConversionOfConvertibleSecurities / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_CallOptionMember
Promissory Note [Member]
Deferred Revenue Arrangement [Line Items]
Promissory note face amount	14,750,000us-gaap_ConvertibleNotesPayable / us-gaap_LongtermDebtTypeAxis = omex_PromissoryNoteMember
"Seattle" Project [Member]
Deferred Revenue Arrangement [Line Items]
Percentage of revenue owed to certificate holder per each million invested		1.00%omex_PercentageOfRevenueOwedToCertificateHoldersPerUnit / us-gaap_DeferredRevenueArrangementTypeAxis = omex_SeattleProjectMember
Common shares issued per unit		100,000omex_CommonSharesIssuedPerUnit / us-gaap_DeferredRevenueArrangementTypeAxis = omex_SeattleProjectMember
Galt Resources, LLC [Member]
Deferred Revenue Arrangement [Line Items]
Percentage of revenue owed to certificate holders		50.00%omex_PercentageOfRevenueOwedToCertificateHolders / us-gaap_DeferredRevenueArrangementTypeAxis = omex_GaltResourcesLlcMember
Percentage of revenue owed to certificate holder per each million invested		1.00%omex_PercentageOfRevenueOwedToCertificateHoldersPerUnit / us-gaap_DeferredRevenueArrangementTypeAxis = omex_GaltResourcesLlcMember
Investment multiplier in case of project success		3omex_InvestmentMultiplierInCaseOfProjectSuccess / us-gaap_DeferredRevenueArrangementTypeAxis = omex_GaltResourcesLlcMember
Projects after bifurcation		2omex_NumberOfProjectsAfterBifurcation / us-gaap_DeferredRevenueArrangementTypeAxis = omex_GaltResourcesLlcMember
Galt Resources, LLC [Member] | SS Gairsoppa [Member]
Deferred Revenue Arrangement [Line Items]
Deferred revenue		3,756,250us-gaap_DeferredRevenueRevenueRecognized / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = omex_SsGairsoppaMember / us-gaap_DeferredRevenueArrangementTypeAxis = omex_GaltResourcesLlcMember
Deferred income from revenue participation rights					12,506,755us-gaap_DeferredRevenueNoncurrent / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = omex_SsGairsoppaMember / us-gaap_DeferredRevenueArrangementTypeAxis = omex_GaltResourcesLlcMember
Galt Resources, LLC [Member] | Maximum [Member]
Deferred Revenue Arrangement [Line Items]
Investment for future revenue rights			7,512,500omex_InvestmentForFutureRevenueRights / us-gaap_DeferredRevenueArrangementTypeAxis = omex_GaltResourcesLlcMember / us-gaap_RangeAxis = us-gaap_MaximumMember
HMS Victory Project [Member]
Deferred Revenue Arrangement [Line Items]
Percentage of revenue owed to certificate holders		7.5125%omex_PercentageOfRevenueOwedToCertificateHolders / us-gaap_DeferredRevenueArrangementTypeAxis = omex_HmsVictoryProjectMember
Revenue Participation Certificates [Member] | "Cambridge" Project [Member]
Deferred Revenue Arrangement [Line Items]
Revenue participation certificates per unit value		50,000us-gaap_InvestmentOwnedRestrictedCarryingValuePerUnitAtDateOfBalanceSheet / us-gaap_DeferredRevenueArrangementTypeAxis = omex_CambridgeProjectMember / invest_InvestmentAxis = omex_RevenueParticipationCertificatesMember
Revenue Participation Certificates [Member] | "Seattle" Project [Member]
Deferred Revenue Arrangement [Line Items]
Revenue participation certificates per unit value		50,000us-gaap_InvestmentOwnedRestrictedCarryingValuePerUnitAtDateOfBalanceSheet / us-gaap_DeferredRevenueArrangementTypeAxis = omex_SeattleProjectMember / invest_InvestmentAxis = omex_RevenueParticipationCertificatesMember
First Payment [Member] | "Cambridge" Project [Member]
Deferred Revenue Arrangement [Line Items]
Percentage of revenue owed to certificate holders		100.00%omex_PercentageOfRevenueOwedToCertificateHolders / us-gaap_DeferredRevenueArrangementTypeAxis = omex_CambridgeProjectMember / invest_InvestmentAxis = omex_ParticipationRevenueRightsFirstPaymentMember
Revenue owed to certificate holder		825,000omex_RevenueOwedToCertificateHolders / us-gaap_DeferredRevenueArrangementTypeAxis = omex_CambridgeProjectMember / invest_InvestmentAxis = omex_ParticipationRevenueRightsFirstPaymentMember
Second Payment [Member] | "Cambridge" Project [Member]
Deferred Revenue Arrangement [Line Items]
Percentage of revenue owed to certificate holders		24.75%omex_PercentageOfRevenueOwedToCertificateHolders / us-gaap_DeferredRevenueArrangementTypeAxis = omex_CambridgeProjectMember / invest_InvestmentAxis = omex_ParticipationRevenueRightsSecondPaymentMember
Second Payment [Member] | "Cambridge" Project [Member] | Minimum [Member]
Deferred Revenue Arrangement [Line Items]
Revenue owed to certificate holder		4,000,000omex_RevenueOwedToCertificateHolders / us-gaap_DeferredRevenueArrangementTypeAxis = omex_CambridgeProjectMember / invest_InvestmentAxis = omex_ParticipationRevenueRightsSecondPaymentMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Second Payment [Member] | "Cambridge" Project [Member] | Maximum [Member]
Deferred Revenue Arrangement [Line Items]
Revenue owed to certificate holder		35,000,000omex_RevenueOwedToCertificateHolders / us-gaap_DeferredRevenueArrangementTypeAxis = omex_CambridgeProjectMember / invest_InvestmentAxis = omex_ParticipationRevenueRightsSecondPaymentMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Third Payment [Member] | "Cambridge" Project [Member]
Deferred Revenue Arrangement [Line Items]
Percentage of revenue owed to certificate holders		12.375%omex_PercentageOfRevenueOwedToCertificateHolders / us-gaap_DeferredRevenueArrangementTypeAxis = omex_CambridgeProjectMember / invest_InvestmentAxis = omex_ParticipationRevenueRightsThirdPaymentMember
Revenue owed to certificate holder		$ 35,000,000omex_RevenueOwedToCertificateHolders / us-gaap_DeferredRevenueArrangementTypeAxis = omex_CambridgeProjectMember / invest_InvestmentAxis = omex_ParticipationRevenueRightsThirdPaymentMember

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- Definition

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

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