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v2.4.1.9

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 | 100,000 omex_DepositsToFundConservationAndDocumentation |
Deposits transferrable to fixed assets | 541,590 us-gaap_DepositsAssetsNoncurrent | 1,673,709 us-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 | 432,500 omex_DepositsWithMinistryOfDefense / us-gaap_StatementGeographicalAxis = country_GB |
Fixed Assets [Member] |  |
Other Long Term Assets [Line Items] |  |
Deposits transferrable to fixed assets | 1,187,400 us-gaap_DepositsAssetsNoncurrent / us-gaap_BalanceSheetLocationAxis = omex_FixedAssetsMember |

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- Definition Carrying value of amounts transferred to third parties for security purposes that are expected to be returned or applied towards payment after one year or beyond the operating cycle, if longer. + 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 -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 + Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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