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Derivative Financial Instruments - Significant Assumptions Utilized in Binomial Lattice Process (Parenthetical) (Detail) | May 10, 2012 | Nov. 08, 2011 | Mar. 31, 2015
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Derivative [Line Items] |  |  |
Shares available for issuance upon exercise | 434,027 omex_NumberOfSecuritiesCalledByWarrantsOrRightsUponAdditionalFinancing | 434,027 omex_NumberOfSecuritiesCalledByWarrantsOrRightsUponAdditionalFinancing |
Level 3 [Member] | Derivative Financial Instruments, Assets [Member] | Warrant Group 2 [Member] |  |  |
Derivative [Line Items] |  |  |
Shares available for issuance upon exercise |  |  | 434,027 omex_NumberOfSecuritiesCalledByWarrantsOrRightsUponAdditionalFinancing / us-gaap_ClassOfWarrantOrRightAxis = omex_WarrantGroupTwoMember / us-gaap_FairValueByAssetClassAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member

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- Definition Number of securities called by warrants or rights upon additional financing. + References No definition available. + Details
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Namespace Prefix: | omex_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |