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Organization and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Number of shares sold		24,000,000us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction
Proceeds from sale of subsidiary stock		$ 27,500,000omex_ProceedsFromSaleOfSubsidiaryStock
Ratio of remaining net proceed	0.25omex_DistributionRatioOfRemainingNetProceed
Percentage of cash proceeds from monetization of recovered cargo	80.00%omex_PercentageOfCashProceedsFromMonetizationOfRecoveredCargo
Percentage of subsequent cash proceeds after priority recoupment	45.00%omex_PercentageOfSubsequentCashProceedsAfterReimbursement
Short-term investment maturity period	Three months or less
Weighted average number of common shares outstanding	84,870,635us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	80,128,827us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	73,889,112us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Receiver [Member]
Property, Plant and Equipment [Line Items]
Percentage of cash proceeds from monetization of recovered cargo	20.00%omex_PercentageOfCashProceedsFromMonetizationOfRecoveredCargo / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = omex_ReceiverMember
Percentage of subsequent cash proceeds after priority recoupment	55.00%omex_PercentageOfSubsequentCashProceedsAfterReimbursement / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = omex_ReceiverMember
Minimum [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, estimated useful life	3 years
Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, estimated useful life	30 years

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 45

-Paragraph 16

-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1505-109256

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