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Investments in Unconsolidated Entities - Additional Information (Detail) (USD $) | 0 Months Ended | 12 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 30, 2014 | Dec. 31, 2013 | Mar. 31, 2015 | Jun. 30, 2012 | Jul. 31, 2013 | Dec. 31, 2011
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Convertible notes, interest rate |  |  | 8.00%us-gaap_DebtInstrumentInterestRateStatedPercentage |  |  |
Common shares received in settlement of accounts receivable/Preferred Non-Voting Class A stock | 5,225 us-gaap_DebtConversionConvertedInstrumentSharesIssued1 |  |  |  |  |
Face Value $10,000,000, 8% Convertible Senior Note Payable [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Convertible notes |  |  |  |  | $ 500,000 omex_DebtInstrumentIssuedFaceAmount / us-gaap_ShortTermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember |
Convertible notes, maturity date |  | Apr. 26, 2014 |  |  |  |
Series A Preferred Stock [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Preferred Voting Class A stock | 522,500 us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |  |  |  |
Neptune Minerals, Inc. [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Net share position in NMI |  |  | 6,190,201 us-gaap_ConversionOfStockSharesConverted1 / us-gaap_BusinessAcquisitionAxis = omex_NeptuneMineralsIncorporatedMember |  |  |
Ownership percentage |  |  | 28.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_BusinessAcquisitionAxis = omex_NeptuneMineralsIncorporatedMember |  |  |
Investment carrying value |  |  | 0 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_BusinessAcquisitionAxis = omex_NeptuneMineralsIncorporatedMember |  |  |
Neptune Minerals, Inc. [Member] | Face Value $10,000,000, 8% Convertible Senior Note Payable [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Convertible notes, interest rate |  | 6.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_BusinessAcquisitionAxis = omex_NeptuneMineralsIncorporatedMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember |  |  |  |
Neptune Minerals, Inc. [Member] | Common Class A [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Shares owned |  |  | 0 omex_EquityMethodInvestmentsSharesOwned / us-gaap_BusinessAcquisitionAxis = omex_NeptuneMineralsIncorporatedMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  |  |
Neptune Minerals, Inc. [Member] | Common Class B [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Net share position in NMI |  |  | 6,184,976 us-gaap_ConversionOfStockSharesConverted1 / us-gaap_BusinessAcquisitionAxis = omex_NeptuneMineralsIncorporatedMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |  |  |
Neptune Minerals, Inc. [Member] | Series A Preferred Stock [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Net share position in NMI |  |  | 5,225 us-gaap_ConversionOfStockSharesConverted1 / us-gaap_BusinessAcquisitionAxis = omex_NeptuneMineralsIncorporatedMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |  |
Neptune Minerals, Inc. [Member] | Series A Voting Shares [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Investment carrying value | 522,500 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_BusinessAcquisitionAxis = omex_NeptuneMineralsIncorporatedMember / us-gaap_StatementClassOfStockAxis = omex_SeriesOneVotingSharesMember |  |  |  |  |
Chatham Rock Phosphate, Ltd. [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Investment carrying value |  |  | 0 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_BusinessAcquisitionAxis = omex_ChathamRockPhosphateLtdMember |  |  |
Deep sea mining exploratory services |  |  |  | 1,680,000 omex_MiningExploratoryServiceRevenue / us-gaap_BusinessAcquisitionAxis = omex_ChathamRockPhosphateLtdMember |  |
Shares received from CRP |  |  |  | 9,320,348 omex_SharesReceivedFromUnconsolidatedEntities / us-gaap_BusinessAcquisitionAxis = omex_ChathamRockPhosphateLtdMember |  |
Chatham Rock Phosphate, Ltd. [Member] | Maximum [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity stake in CRP |  |  | 10.00%us-gaap_MinorityInterestOwnershipPercentageByParent / us-gaap_BusinessAcquisitionAxis = omex_ChathamRockPhosphateLtdMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |
Dorado Ocean Resources, Ltd. [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership percentage |  |  |  |  |  | 41.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_BusinessAcquisitionAxis = omex_DoradoOceanResourcesLimitedMember
Loss from unconsolidated entity |  |  | $ 20,700,000 omex_CumulativeAndOutstandingLosses / us-gaap_BusinessAcquisitionAxis = omex_DoradoOceanResourcesLimitedMember |  |  |

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