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Derivative Financial Instruments - Significant Assumptions Utilized in Valuation Technique (Parenthetical) (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015
Derivative [Line Items]
Underlying price per share used in the MCS calculations	$ 2.50omex_FairValueAssumptionsQuotedPrice
Oceanica Resources S. de. R.L [Member]
Derivative [Line Items]
Percentage of shares purchased by private investor	24.00%omex_PercentageOfSharesPurchasedByAgentInPrivatePlacement / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = omex_OceanicaResourcesMember
Per share value of shares purchased by private investor	$ 2.50us-gaap_SaleOfStockPricePerShare / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = omex_OceanicaResourcesMember

X

- Definition

Fair value assumptions quoted price.

+ References

No definition available.

+ Details

Name:	omex_FairValueAssumptionsQuotedPrice
Namespace Prefix:	omex_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Percentage of shares purchased by agent in private placement.

+ References

No definition available.

+ Details

Name:	omex_PercentageOfSharesPurchasedByAgentInPrivatePlacement
Namespace Prefix:	omex_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_DerivativeLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

+ References

No definition available.

+ Details

Name:	us-gaap_SaleOfStockPricePerShare
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=omex_OceanicaResourcesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: