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Derivative Financial Instruments - Significant Assumptions Utilized in Valuation Technique (Parenthetical) (Detail) (USD $) | 9 Months Ended
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Sep. 30, 2014
Derivative [Line Items] |
Underlying price per share used in the MCS calculations | $ 2.50
Oceanica Resources S. de. R.L [Member] |
Derivative [Line Items] |
Percentage of shares purchased by private investor | 21.00%
Per share value of shares purchased by private investor | $ 2.50

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- Definition Derivative financial instruments fair value assumptions quoted market price. + References No definition available. + Details
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Namespace Prefix: | omex_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

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- 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

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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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- 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
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Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant