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Concentration of Credit Risk - Additional Information (Detail) (USD $) | 3 Months Ended
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Mar. 31, 2015 Institution
Concentration Of Credit Risk [Line Items] |
Uninsured cash balance | $ 859,000 us-gaap_CashUninsuredAmount
Number of financial institutions in which cash is deposited | 1 omex_NumberOfFinancialInstitutionsInWhichCashDeposited
Mortgages Payable [Member] |
Concentration Of Credit Risk [Line Items] |
Basis spread on variable rate, points | 0.01%omex_DebtInstrumentBasisSpreadOnVariableRatePoints / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember
Interest obligation from basis points variation, per month | 852 omex_InterestObligationFromBasisPointVariation / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember
Credit risk maturity period | 2016-07
Term Loan [Member] |
Concentration Of Credit Risk [Line Items] |
Interest obligation from basis points variation, per month | 2,436 omex_InterestObligationFromBasisPointVariation / us-gaap_LongtermDebtTypeAxis = omex_TermLoanMember
Basis spread on variable rate, points | 0.01%us-gaap_DebtInstrumentInterestRateIncreaseDecrease / us-gaap_LongtermDebtTypeAxis = omex_TermLoanMember
Project Term Loans [Member] |
Concentration Of Credit Risk [Line Items] |
Interest obligation from basis points variation, per month | $ 6,510 omex_InterestObligationFromBasisPointVariation / us-gaap_LongtermDebtTypeAxis = omex_ProjectTermLoanMember

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- Details
Name: | omex_ConcentrationOfCreditRiskLineItems
Namespace Prefix: | omex_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Debt instrument basis spread on variable rate points. + References No definition available. + Details
Name: | omex_DebtInstrumentBasisSpreadOnVariableRatePoints
Namespace Prefix: | omex_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Interest obligation from basis point variation. + References No definition available. + Details
Name: | omex_InterestObligationFromBasisPointVariation
Namespace Prefix: | omex_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Maturity period of concentration of credit risk. + References No definition available. + Details
Name: | omex_MaturityPeriodOfConcentrationOfCreditRisk
Namespace Prefix: | omex_
Data Type: | xbrli:gYearMonthItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of financial institutions in which cash deposited. + References No definition available. + Details
Name: | omex_NumberOfFinancialInstitutionsInWhichCashDeposited
Namespace Prefix: | omex_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of cash as of the balance sheet date that is not insured by the Federal Deposit Insurance Corporation. + References No definition available. + Details
Name: | us-gaap_CashUninsuredAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Incremental percentage increase (decrease) in the stated rate on a debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentInterestRateIncreaseDecrease
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=omex_ProjectTermLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=omex_TermLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_MortgagesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |