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Mortgage and Loans Payable - Schedule of Consolidated Debt (Detail) (USD $) | Mar. 31, 2015 | Dec. 31, 2014
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Debt Instrument [Line Items] |  |
Total mortgages and loans payable | $ 22,314,458 omex_MortgageAndLoansPayableCurrentAndNonCurrent | $ 21,164,881 omex_MortgageAndLoansPayableCurrentAndNonCurrent
Project Term Loans [Member] |  |
Debt Instrument [Line Items] |  |
Total mortgages and loans payable | 15,789,600 omex_MortgageAndLoansPayableCurrentAndNonCurrent / us-gaap_LongtermDebtTypeAxis = omex_ProjectTermLoanMember | 15,502,422 omex_MortgageAndLoansPayableCurrentAndNonCurrent / us-gaap_LongtermDebtTypeAxis = omex_ProjectTermLoanMember
2014 Convertible Promissory Notes [Member] |  |
Debt Instrument [Line Items] |  |
Total mortgages and loans payable | 1,937,858 omex_MortgageAndLoansPayableCurrentAndNonCurrent / us-gaap_LongtermDebtTypeAxis = omex_TwoThousandAndFourteenConvertiblePromissoryNotesMember |
Mortgages Payable [Member] |  |
Debt Instrument [Line Items] |  |
Total mortgages and loans payable | 1,087,000 omex_MortgageAndLoansPayableCurrentAndNonCurrent / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember | 1,662,459 omex_MortgageAndLoansPayableCurrentAndNonCurrent / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember
Term Loan [Member] |  |
Debt Instrument [Line Items] |  |
Total mortgages and loans payable | $ 3,500,000 omex_MortgageAndLoansPayableCurrentAndNonCurrent / us-gaap_ShortTermDebtTypeAxis = omex_TermLoanMember | $ 4,000,000 omex_MortgageAndLoansPayableCurrentAndNonCurrent / us-gaap_ShortTermDebtTypeAxis = omex_TermLoanMember

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- Definition Mortgage and loans payable current and non current. + References No definition available. + Details
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- Details
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- Details
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- Details
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Period Type: |