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Income Taxes - Schedule of Income (Loss) Before Income Taxes (Parenthetical) (Detail)	6 Months Ended
	Jun. 30, 2013
Income Tax Disclosure [Abstract]
Alternative Minimum Tax Rate	20.00%

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- 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
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