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

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- 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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