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Cash and Cash Equivalents - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2013 Investment
Cash And Cash Equivalents [Abstract] |
Maturity days of cash and cash equivalents | 90 days
Number of United States Treasury Bills owned | 0

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- Definition Cash and cash equivalents maturity days . + References No definition available. + Details
Name: | omex_CashAndCashEquivalentsMaturityDays
Namespace Prefix: | omex_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of treasury bills owned. + References No definition available. + Details
Name: | omex_NumberOfTreasuryBillsOwned
Namespace Prefix: | omex_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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