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Derivative Financial Instruments - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	May 10, 2012	Nov. 08, 2011	Oct. 11, 2010	Apr. 08, 2011	Apr. 13, 2014	Oct. 11, 2013
Derivative [Line Items]
Compound embedded derivatives	$ 0us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeNet
Warrants issued to acquire common shares			260,417omex_ClassOfWarrantOrRightWarrantsIssued		1,800,000omex_ClassOfWarrantOrRightWarrantsIssued
Linked common shares	1,562,500omex_DerivativeFinancialInstrumentsFairValueAssumptionsLinkedCommonShares	1,562,500omex_DerivativeFinancialInstrumentsFairValueAssumptionsLinkedCommonShares
Warrants expiration date	Apr. 13, 2014
Shares available for issuance upon exercise			434,027omex_NumberOfSecuritiesCalledByWarrantsOrRightsUponAdditionalFinancing	434,027omex_NumberOfSecuritiesCalledByWarrantsOrRightsUponAdditionalFinancing
Additional financing			$ 8,000,000us-gaap_DebtInstrumentFaceAmount
Warrants Attached to Series G Preferred Stock [Member]
Derivative [Line Items]
Warrants issued to acquire common shares						525,000omex_ClassOfWarrantOrRightWarrantsIssued / us-gaap_ClassOfWarrantOrRightAxis = omex_WarrantsAttachedToSeriesGPreferredStockMember
Warrants Attached to Senior Convertible Debt [Member]
Derivative [Line Items]
Warrants issued to acquire common shares				1,302,083omex_ClassOfWarrantOrRightWarrantsIssued / us-gaap_ClassOfWarrantOrRightAxis = omex_WarrantsAttachedToSeniorConvertibleDebtMember
Warrants linked to common stock, outstanding	1,562,500us-gaap_ClassOfWarrantOrRightOutstanding / us-gaap_ClassOfWarrantOrRightAxis = omex_WarrantsAttachedToSeniorConvertibleDebtMember
Warrants expiration date	Nov. 09, 2016
Common Stock [Member]
Derivative [Line Items]
Linked common shares							525,000omex_DerivativeFinancialInstrumentsFairValueAssumptionsLinkedCommonShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Warrants linked to common stock, outstanding	0us-gaap_ClassOfWarrantOrRightOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	1,725,000us-gaap_ClassOfWarrantOrRightOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Common Stock [Member] | Level 3 [Member]
Derivative [Line Items]
Linked common shares								1,725,000omex_DerivativeFinancialInstrumentsFairValueAssumptionsLinkedCommonShares / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Warrants linked to common stock, outstanding	0us-gaap_ClassOfWarrantOrRightOutstanding / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	0us-gaap_ClassOfWarrantOrRightOutstanding / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Warrants expiration date	Oct. 11, 2013

X

- Definition

Class Of Warrant Or Right, Warrants Issued

+ References

No definition available.

+ Details

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Namespace Prefix:	omex_
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Balance Type:	na
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X

- Definition

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+ References

No definition available.

+ Details

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X

- Definition

Number of securities called by warrants or rights upon additional financing.

+ References

No definition available.

+ Details

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Namespace Prefix:	omex_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Date the warrants or rights are exercisable, in CCYY-MM-DD format.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(i)(3))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph i

-Subparagraph 3

-Article 4

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X

- Definition

Number of warrants or rights outstanding.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(i))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690



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-Publisher SEC

-Name Regulation S-X (SX)

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-Section 08

-Paragraph i

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X

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

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- Details

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X

- Definition

Net fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as assets, net of those classified as liabilities.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 45

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958

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