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

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Mortgage and loans payable current and non current.

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