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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
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Debt Instrument [Line Items] |  |
Cash proceeds | $ 9,955,000 us-gaap_ConvertibleNotesPayable |
Promissory Note [Member] |  |
Debt Instrument [Line Items] |  |
Cash proceeds |  | 14,750,000 us-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 | 2,000,000 us-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 | 67,241 us-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 | $ 1,932,759 us-gaap_ConvertibleNotesPayable / us-gaap_DebtInstrumentAxis = omex_TrancheOneMember / us-gaap_LongtermDebtTypeAxis = omex_PromissoryNoteMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = omex_OceanicaResourcesMember / us-gaap_StatementClassOfStockAxis = omex_TwoThousandAndFourteenConvertiblePromissoryNotesMember |

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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of a written promise to pay a note, initially due after one year or beyond the operating cycle if longer, which can be exchanged for a specified amount of one or more securities (typically common stock), at the option of the issuer or the holder. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=omex_PromissoryNoteMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |