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Derivative Financial Instruments - Significant Assumptions Utilized in Valuation Technique (Parenthetical) (Detail) (USD $) | 3 Months Ended
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Mar. 31, 2015
Derivative [Line Items] |
Underlying price per share used in the MCS calculations | $ 2.50 omex_FairValueAssumptionsQuotedPrice
Oceanica Resources S. de. R.L [Member] |
Derivative [Line Items] |
Percentage of shares purchased by private investor | 24.00%omex_PercentageOfSharesPurchasedByAgentInPrivatePlacement / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = omex_OceanicaResourcesMember
Per share value of shares purchased by private investor | $ 2.50 us-gaap_SaleOfStockPricePerShare / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = omex_OceanicaResourcesMember

X
- Definition Fair value assumptions quoted price. + References No definition available. + Details
Name: | omex_FairValueAssumptionsQuotedPrice
Namespace Prefix: | omex_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of shares purchased by agent in private placement. + References No definition available. + Details
Name: | omex_PercentageOfSharesPurchasedByAgentInPrivatePlacement
Namespace Prefix: | omex_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction. + References No definition available. + Details
Name: | us-gaap_SaleOfStockPricePerShare
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=omex_OceanicaResourcesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |