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Cash and Cash Equivalents - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2013 Investment
Cash And Cash Equivalents [Abstract]
Maturity days of cash and cash equivalents	90 days
Number of United States Treasury Bills owned	0

X

- Definition

Cash and cash equivalents maturity days .

+ References

No definition available.

+ Details

Name:	omex_CashAndCashEquivalentsMaturityDays
Namespace Prefix:	omex_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of treasury bills owned.

+ References

No definition available.

+ Details

Name:	omex_NumberOfTreasuryBillsOwned
Namespace Prefix:	omex_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Details

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