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Mortgage and Loans Payable - Schedule of Consolidated Debt (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Company's consolidated debt	$ 22,532,839	$ 18,820,683
Term Loan [Member]
Debt Instrument [Line Items]
Company's consolidated debt	5,000,000	5,000,000
Project Term Loan [Member]
Debt Instrument [Line Items]
Company's consolidated debt	10,000,000
Face Value $10,000,000, 8% Convertible Senior Note Payable [Member]
Debt Instrument [Line Items]
Company's consolidated debt	1,716,333	8,234,367
Face Value $8,000,000, 9% Convertible Senior Note Payable [Member]
Debt Instrument [Line Items]
Company's consolidated debt	3,962,053	3,628,779
Mortgage Payable [Member]
Debt Instrument [Line Items]
Company's consolidated debt	$ 1,854,453	$ 1,957,537

X

- Definition

Mortgage and loans payable current and non current.

+ References

No definition available.

+ Details

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Namespace Prefix:	omex_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

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