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Stockholders' Equity (Deficit) - Summary of Preferred Stock Allocated to Investors (Detail) (USD $)	Mar. 31, 2015
Preferred Stock [Line Items]
Shares	187,801,782us-gaap_PreferredStockSharesIssued
Total Investment	$ 144,462,912us-gaap_PreferredStockValue
Penelope Mining LLC [Member] | Series AA-1 Convertible Preferred Stock [Member]
Preferred Stock [Line Items]
Shares	101,124,042us-gaap_PreferredStockSharesIssued / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = omex_PenelopeMiningLlcMember / us-gaap_StatementClassOfStockAxis = omex_SeriesAaOneConvertiblePreferredStockMember
Price Per Share	$ 1.00us-gaap_SharePrice / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = omex_PenelopeMiningLlcMember / us-gaap_StatementClassOfStockAxis = omex_SeriesAaOneConvertiblePreferredStockMember
Total Investment	101,124,042us-gaap_PreferredStockValue / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = omex_PenelopeMiningLlcMember / us-gaap_StatementClassOfStockAxis = omex_SeriesAaOneConvertiblePreferredStockMember
Penelope Mining LLC [Member] | Series AA-2 Convertible Preferred Stock [Member]
Preferred Stock [Line Items]
Shares	86,677,740us-gaap_PreferredStockSharesIssued / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = omex_PenelopeMiningLlcMember / us-gaap_StatementClassOfStockAxis = omex_SeriesAaTwoConvertiblePreferredStockMember
Price Per Share	$ 0.50us-gaap_SharePrice / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = omex_PenelopeMiningLlcMember / us-gaap_StatementClassOfStockAxis = omex_SeriesAaTwoConvertiblePreferredStockMember
Total Investment	$ 43,338,870us-gaap_PreferredStockValue / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = omex_PenelopeMiningLlcMember / us-gaap_StatementClassOfStockAxis = omex_SeriesAaTwoConvertiblePreferredStockMember

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- Definition

Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.28)

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



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29

-Article 5

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- Definition

Aggregate par or stated value of issued nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable preferred shares, par value and other disclosure concepts are in another section within stockholders' equity.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770



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 210.5-02.28)

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



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29

-Article 5

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- Definition

Price of a single share of a number of saleable stocks of a company.

+ References

No definition available.

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