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Mortgage and Loans Payable - Schedule of Consolidated Debt (Parenthetical) (Detail) (USD $)
May 10, 2012
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]      
Total mortgages and loans payable, face amount $ 8,000,000us-gaap_DebtInstrumentFaceAmount    
Face Value $10,000,000, 8% Convertible Senior Note Payable [Member]      
Debt Instrument [Line Items]      
Total mortgages and loans payable, face amount   10,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ConvertibleNotesPayableMember		 10,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ConvertibleNotesPayableMember
Total mortgages and loans payable, interest rate   8.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ConvertibleNotesPayableMember		 8.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ConvertibleNotesPayableMember
Face Value $8,000,000, 9% Convertible Senior Note Payable [Member]      
Debt Instrument [Line Items]      
Total mortgages and loans payable, face amount   $ 8,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= omex_NinePercentConvertibleSeniorNotePayableMember		 $ 8,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= omex_NinePercentConvertibleSeniorNotePayableMember
Total mortgages and loans payable, interest rate   9.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= omex_NinePercentConvertibleSeniorNotePayableMember		 9.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= omex_NinePercentConvertibleSeniorNotePayableMember