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Deferred Revenue - Additional Information (Detail) (USD $) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2013 Contract | Dec. 31, 2012 Contract
Deferred Revenue Disclosure [Abstract] |  |
Marine services obligations | $ 2,835,522 | $ 2,835,522
Number of service contract with service obligation | 2 | 2

X
- Definition Marine services obligations deferred revenue. + References No definition available. + Details
Name: | omex_MarineServicesObligationsDeferredRevenue
Namespace Prefix: | omex_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Number of service contracts under service obligation. + References No definition available. + Details
Name: | omex_NumberOfServiceContractsUnderServiceObligation
Namespace Prefix: | omex_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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