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Mortgage and Loans Payable - Schedule of Allocation of Cash Proceeds to Derivative Components at their Fair Values - Promissory Note (Detail) (USD $)
Mar. 31, 2015
Mar. 11, 2015
Debt Instrument [Line Items]    
Cash proceeds $ 9,955,000us-gaap_ConvertibleNotesPayable  
Promissory Note [Member]    
Debt Instrument [Line Items]    
Cash proceeds   14,750,000us-gaap_ConvertibleNotesPayable
/ us-gaap_LongtermDebtTypeAxis
= omex_PromissoryNoteMember
Promissory Note [Member] | Oceanica Resources S. de. R.L [Member] | First Tranche [Member]    
Debt Instrument [Line Items]    
Cash proceeds 2,000,000us-gaap_ConvertibleNotesPayable
/ us-gaap_DebtInstrumentAxis
= omex_TrancheOneMember
/ us-gaap_LongtermDebtTypeAxis
= omex_PromissoryNoteMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= omex_OceanicaResourcesMember		  
Promissory Note [Member] | Oceanica Resources S. de. R.L [Member] | Deferred Income Call Option [Member] | First Tranche [Member]    
Debt Instrument [Line Items]    
Cash proceeds 67,241us-gaap_ConvertibleNotesPayable
/ us-gaap_DebtInstrumentAxis
= omex_TrancheOneMember
/ us-gaap_DerivativeInstrumentRiskAxis
= omex_DeferredRevenueCallOptionMember
/ us-gaap_LongtermDebtTypeAxis
= omex_PromissoryNoteMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= omex_OceanicaResourcesMember		  
Promissory Note [Member] | Oceanica Resources S. de. R.L [Member] | 2014 Convertible Promissory Notes [Member] | First Tranche [Member]    
Debt Instrument [Line Items]    
Cash proceeds $ 1,932,759us-gaap_ConvertibleNotesPayable
/ us-gaap_DebtInstrumentAxis
= omex_TrancheOneMember
/ us-gaap_LongtermDebtTypeAxis
= omex_PromissoryNoteMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= omex_OceanicaResourcesMember
/ us-gaap_StatementClassOfStockAxis
= omex_TwoThousandAndFourteenConvertiblePromissoryNotesMember