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Property and Equipment - Summary of Property and Equipment (Detail) (USD $) | Dec. 31, 2014 | Dec. 31, 2013
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Property, Plant and Equipment [Line Items] |  |
Property and equipment, gross | $ 29,679,030 us-gaap_PropertyPlantAndEquipmentGross | $ 26,751,337 us-gaap_PropertyPlantAndEquipmentGross
Less: Accumulated depreciation | (22,443,492)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment | (16,973,085)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Total property and equipment | 7,235,538 us-gaap_PropertyPlantAndEquipmentNet | 9,778,252 us-gaap_PropertyPlantAndEquipmentNet
Building, Improvements and Land [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property and equipment, gross | 3,758,686 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandBuildingsAndImprovementsMember | 4,756,306 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandBuildingsAndImprovementsMember
Building and Land Held for Sale [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property and equipment, gross | 1,024,999 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = omex_BuildingAndLandHeldForSaleMember |
Computers and Peripherals [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property and equipment, gross | 1,613,744 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ComputerEquipmentMember | 1,431,789 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ComputerEquipmentMember
Furniture and Office Equipment [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property and equipment, gross | 2,376,650 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_FurnitureAndFixturesMember | 1,973,130 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_FurnitureAndFixturesMember
Vessel and Equipment [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property and equipment, gross | 19,123,758 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = omex_VesselAndEquipmentMember | 16,772,083 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = omex_VesselAndEquipmentMember
Exhibits and Related [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property and equipment, gross | $ 1,781,193 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = omex_ExhibitsAndRelatedMember | $ 1,818,029 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = omex_ExhibitsAndRelatedMember

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- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 14 -Article 5 + Details
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