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Income Taxes - Schedule of Income (Loss) Before Income Taxes (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Alternative Minimum Tax Rate	20.00%omex_AlternativeMinimumTaxRate

X

- Definition

Alternative minimum tax rate.

+ References

No definition available.

+ Details

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

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- Details

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