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Other Long-Term Assets - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Other Long Term Assets [Line Items]
Deposits for conservation and documentation of artifacts	100,000omex_DepositsToFundConservationAndDocumentation
Deposits transferrable to fixed assets	541,590us-gaap_DepositsAssetsNoncurrent	1,673,709us-gaap_DepositsAssetsNoncurrent
Maximum [Member]
Other Long Term Assets [Line Items]
Number of years for Image use rights	5 years
UNITED KINGDOM
Other Long Term Assets [Line Items]
Deposits with United Kingdom's Ministry of Defense	432,500omex_DepositsWithMinistryOfDefense / us-gaap_StatementGeographicalAxis = country_GB
Fixed Assets [Member]
Other Long Term Assets [Line Items]
Deposits transferrable to fixed assets	1,187,400us-gaap_DepositsAssetsNoncurrent / us-gaap_BalanceSheetLocationAxis = omex_FixedAssetsMember

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+ References

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.17)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 17

-Article 5

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