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Derivative Financial Instruments - Significant Assumptions Utilized in Valuation Technique (Parenthetical) (Detail) (USD $)	9 Months Ended
	Sep. 30, 2014
Derivative [Line Items]
Underlying price per share used in the MCS calculations	$ 2.50
Oceanica Resources S. de. R.L [Member]
Derivative [Line Items]
Percentage of shares purchased by private investor	21.00%
Per share value of shares purchased by private investor	$ 2.50

X

- Definition

Derivative financial instruments fair value assumptions quoted market price.

+ References

No definition available.

+ Details

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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