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Mortgage and Loans Payable - Schedule of Consolidated Debt (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Total mortgages and loans payable	$ 21,164,881omex_MortgageAndLoansPayableCurrentAndNonCurrent	$ 22,031,808omex_MortgageAndLoansPayableCurrentAndNonCurrent
Term Loan [Member]
Debt Instrument [Line Items]
Total mortgages and loans payable	4,000,000omex_MortgageAndLoansPayableCurrentAndNonCurrent / us-gaap_LongtermDebtTypeAxis = us-gaap_LoansPayableMember	5,000,000omex_MortgageAndLoansPayableCurrentAndNonCurrent / us-gaap_LongtermDebtTypeAxis = us-gaap_LoansPayableMember
Project Term Loans [Member]
Debt Instrument [Line Items]
Total mortgages and loans payable	15,502,422omex_MortgageAndLoansPayableCurrentAndNonCurrent / us-gaap_LongtermDebtTypeAxis = omex_ProjectTermLoanMember	10,000,000omex_MortgageAndLoansPayableCurrentAndNonCurrent / us-gaap_LongtermDebtTypeAxis = omex_ProjectTermLoanMember
Face Value $8,000,000, 9% Convertible Senior Note Payable [Member]
Debt Instrument [Line Items]
Total mortgages and loans payable		4,039,446omex_MortgageAndLoansPayableCurrentAndNonCurrent / us-gaap_LongtermDebtTypeAxis = omex_NinePercentConvertibleSeniorNotePayableMember
Mortgages Payable [Member]
Debt Instrument [Line Items]
Total mortgages and loans payable	1,662,459omex_MortgageAndLoansPayableCurrentAndNonCurrent / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember	1,816,286omex_MortgageAndLoansPayableCurrentAndNonCurrent / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember
Face Value $10,000,000, 8% Convertible Senior Note Payable [Member]
Debt Instrument [Line Items]
Total mortgages and loans payable		$ 1,176,076omex_MortgageAndLoansPayableCurrentAndNonCurrent / us-gaap_ShortTermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember

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Mortgage and loans payable current and non current.

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