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Accrued Expenses - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2014
Payables and Accruals [Abstract]
Percentage of expense received	20.00%omex_PercentageOfReimbursementOfSearchAndRecoveryExpenses

X

- Definition

Percentage of reimbursement of search and recovery expenses.

+ References

No definition available.

+ Details

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

X

- Details

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