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Deferred Income and Revenue Participation Rights - Additional Information (Detail) (USD $) | 12 Months Ended | 1 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2014 Project Investment | Feb. 28, 2011 | Dec. 31, 2013 | Mar. 31, 2013
Deferred Revenue Arrangement [Line Items] |  |  |  |
Deferred income from revenue participation rights | 4,643,750 us-gaap_DeferredRevenueNoncurrent |  | $ 4,643,750 us-gaap_DeferredRevenueNoncurrent |
Revenue participation agreement | 15,000,000 omex_RevenueParticipationAgreementValue |  |  |
Deferred income and participating revenue rights | 4,643,750 us-gaap_DeferredRevenue |  | 6,484,154 us-gaap_DeferredRevenue |
"Cambridge" Project [Member] |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |
Deferred income and participating revenue rights | 825,000 us-gaap_DeferredRevenue / us-gaap_DeferredRevenueArrangementTypeAxis = omex_CambridgeProjectMember |  | 825,000 us-gaap_DeferredRevenue / us-gaap_DeferredRevenueArrangementTypeAxis = omex_CambridgeProjectMember |
"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 | 100,000 omex_CommonSharesIssuedPerUnit / us-gaap_DeferredRevenueArrangementTypeAxis = omex_SeattleProjectMember |  |  |
Deferred income and participating revenue rights | 62,500 us-gaap_DeferredRevenue / us-gaap_DeferredRevenueArrangementTypeAxis = omex_SeattleProjectMember |  | 62,500 us-gaap_DeferredRevenue / 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 | 3 omex_InvestmentMultiplierInCaseOfProjectSuccess / us-gaap_DeferredRevenueArrangementTypeAxis = omex_GaltResourcesLlcMember |  |  |
Projects after bifurcation | 2 omex_NumberOfProjectsAfterBifurcation / us-gaap_DeferredRevenueArrangementTypeAxis = omex_GaltResourcesLlcMember |  |  |
Galt Resources, LLC [Member] | SS Gairsoppa [Member] |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |
Deferred revenue | 3,756,250 us-gaap_DeferredRevenueRevenueRecognized / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = omex_SsGairsoppaMember / us-gaap_DeferredRevenueArrangementTypeAxis = omex_GaltResourcesLlcMember |  |  |
Deferred income from revenue participation rights |  |  |  | 12,506,755 us-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 |  | 7,512,500 omex_InvestmentForFutureRevenueRights / us-gaap_DeferredRevenueArrangementTypeAxis = omex_GaltResourcesLlcMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Marine Services Projects [Member] |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |
Deferred income and participating revenue rights | 0 us-gaap_DeferredRevenue / us-gaap_DeferredRevenueArrangementTypeAxis = omex_MarineServicesProjectsMember |  | 1,840,404 us-gaap_DeferredRevenue / us-gaap_DeferredRevenueArrangementTypeAxis = omex_MarineServicesProjectsMember |
Deferred revenue,return of funds | 1,400,000 us-gaap_DeferredRevenueRefundPayments / us-gaap_DeferredRevenueArrangementTypeAxis = omex_MarineServicesProjectsMember |  |  |
Deferred revenue,Accounts payable | 1,840,404 us-gaap_AccountsPayableCurrentAndNoncurrent / us-gaap_DeferredRevenueArrangementTypeAxis = omex_MarineServicesProjectsMember |  |  |
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 |  |  |
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 / omex_ParticipationRevenueRightsAxis = omex_ParticipationRevenueRightsFirstPaymentMember |  |  |
Revenue owed to certificate holder | 825,000 omex_RevenueOwedToCertificateHolders / us-gaap_DeferredRevenueArrangementTypeAxis = omex_CambridgeProjectMember / omex_ParticipationRevenueRightsAxis = 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 / omex_ParticipationRevenueRightsAxis = omex_ParticipationRevenueRightsSecondPaymentMember |  |  |
Second Payment [Member] | "Cambridge" Project [Member] | Minimum [Member] |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |
Revenue owed to certificate holder | 4,000,000 omex_RevenueOwedToCertificateHolders / us-gaap_DeferredRevenueArrangementTypeAxis = omex_CambridgeProjectMember / omex_ParticipationRevenueRightsAxis = 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 | 35,000,000 omex_RevenueOwedToCertificateHolders / us-gaap_DeferredRevenueArrangementTypeAxis = omex_CambridgeProjectMember / omex_ParticipationRevenueRightsAxis = 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 / omex_ParticipationRevenueRightsAxis = omex_ParticipationRevenueRightsThirdPaymentMember |  |  |
Revenue owed to certificate holder | 35,000,000 omex_RevenueOwedToCertificateHolders / us-gaap_DeferredRevenueArrangementTypeAxis = omex_CambridgeProjectMember / omex_ParticipationRevenueRightsAxis = omex_ParticipationRevenueRightsThirdPaymentMember |  |  |
Revenue Participation Certificates [Member] | "Cambridge" Project [Member] |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |
Revenue participation certificates per unit value | 50,000 us-gaap_InvestmentOwnedRestrictedCarryingValuePerUnitAtDateOfBalanceSheet / us-gaap_DeferredRevenueArrangementTypeAxis = omex_CambridgeProjectMember / omex_ParticipationRevenueRightsAxis = omex_RevenueParticipationCertificatesMember |  |  |
Revenue Participation Certificates [Member] | "Seattle" Project [Member] |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |
Revenue participation certificates per unit value | 50,000 us-gaap_InvestmentOwnedRestrictedCarryingValuePerUnitAtDateOfBalanceSheet / us-gaap_DeferredRevenueArrangementTypeAxis = omex_SeattleProjectMember / omex_ParticipationRevenueRightsAxis = omex_RevenueParticipationCertificatesMember |  |  |

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