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Summary of Significant Accounting Policies - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Property, Plant and Equipment [Line Items]
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	86,515,835us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	83,937,883us-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

X

- Definition

Percentage of cash proceeds from monetization of recovered cargo.

+ References

No definition available.

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X

- Definition

Percentage of subsequent cash proceeds after reimbursement.

+ References

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X

- Definition

Short-term investments maturity period.

+ References

No definition available.

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X

- Details

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X

- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

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X

- Definition

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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