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Deferred Income and Revenue Participation Rights - Participating Revenue Rights (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Deferred Revenue Arrangement [Line Items]
Deferred income and participating revenue rights	$ 4,643,750us-gaap_DeferredRevenue	$ 6,484,154us-gaap_DeferredRevenue
"Cambridge" Project [Member]
Deferred Revenue Arrangement [Line Items]
Deferred income and participating revenue rights	825,000us-gaap_DeferredRevenue / us-gaap_DeferredRevenueArrangementTypeAxis = omex_CambridgeProjectMember	825,000us-gaap_DeferredRevenue / us-gaap_DeferredRevenueArrangementTypeAxis = omex_CambridgeProjectMember
"Seattle" Project [Member]
Deferred Revenue Arrangement [Line Items]
Deferred income and participating revenue rights	62,500us-gaap_DeferredRevenue / us-gaap_DeferredRevenueArrangementTypeAxis = omex_SeattleProjectMember	62,500us-gaap_DeferredRevenue / us-gaap_DeferredRevenueArrangementTypeAxis = omex_SeattleProjectMember
Galt Resources, LLC (HMS Victory) [Member]
Deferred Revenue Arrangement [Line Items]
Deferred income and participating revenue rights	3,756,250us-gaap_DeferredRevenue / us-gaap_DeferredRevenueArrangementTypeAxis = omex_GaltResourcesLlcHmsVictoryMember	3,756,250us-gaap_DeferredRevenue / us-gaap_DeferredRevenueArrangementTypeAxis = omex_GaltResourcesLlcHmsVictoryMember
Marine Services Projects [Member]
Deferred Revenue Arrangement [Line Items]
Deferred income and participating revenue rights	$ 0us-gaap_DeferredRevenue / us-gaap_DeferredRevenueArrangementTypeAxis = omex_MarineServicesProjectsMember	$ 1,840,404us-gaap_DeferredRevenue / us-gaap_DeferredRevenueArrangementTypeAxis = omex_MarineServicesProjectsMember

X

- Definition

Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 13

-Section A



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 605

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 13.A.4(a).Q1 Response)

-URI http://asc.fasb.org/extlink&oid=27012821&loc=d3e214044-122780

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Details

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Balance Type:	na
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- Details

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- Details

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X

- Details

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X

- Details

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