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Redeemable Series G Preferred Stock - Allocation of Cash from Series G Preferred and Warrants Issued (Parenthetical) (Detail)	6 Months Ended
	Jun. 30, 2013
Minimum [Member]
Temporary Equity [Line Items]
Credit-risk adjusted rates	3.98%
Maximum [Member]
Temporary Equity [Line Items]
Credit-risk adjusted rates	4.89%

X

- Definition

Credit risk adjustment rate.

+ References

No definition available.

+ Details

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

X

- Details

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