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Derivative Financial Instruments - Significant Assumptions Utilized in Binomial Lattice Process (Parenthetical) (Detail) | May 10, 2012 | Nov. 08, 2011 | Sep. 30, 2014 Level 3 [Member] Warrant Group 3 [Member]
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Derivative [Line Items] |  |  |
Shares available for issuance upon exercise | 434,027 | 434,027 | 434,027

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

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