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Income Taxes - Schedule of Income (Loss) Before Income Taxes (Parenthetical) (Detail) | 9 Months Ended
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Sep. 30, 2013
Income Tax Disclosure [Abstract] |
Alternative Minimum Tax Rate | 20.00%

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- Definition Alternative minimum tax rate. + References No definition available. + Details
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Namespace Prefix: | omex_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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