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Accounts Receivable - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Reserves for doubtful accounts	$ 4,631,593us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent	$ 5,131,593us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Recoupment of operations and research costs	6,290,465us-gaap_RecoveryOfDirectCosts
Neptune Minerals, Inc. [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Reserves for doubtful accounts		5,131,593us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent / us-gaap_BusinessAcquisitionAxis = omex_NeptuneMineralsIncorporatedMember
Dorado Ocean Resources, Ltd. [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Reserves for doubtful accounts	$ 4,631,593us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent / us-gaap_BusinessAcquisitionAxis = omex_DoradoOceanResourcesLimitedMember

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- Definition

A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 4

-Article 5



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5074-111524



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.4)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Return of or reimbursements received in relation to direct costs and expenses previously paid or incurred.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.2)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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