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Other Long-Term Assets - Components of Other Long-Term Assets (Detail) (USD $) | Dec. 31, 2014 | Dec. 31, 2013
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Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |  |
Recovered cargo | $ 730,463 omex_RecoveredCargoNonCurrent | $ 1,191,952 omex_RecoveredCargoNonCurrent
Deposits | 541,590 us-gaap_DepositsAssetsNoncurrent | 1,673,709 us-gaap_DepositsAssetsNoncurrent
Image use rights, net |  | 280 omex_ImageUseRightsNetNonCurrent
Total other long-term assets | $ 1,272,053 us-gaap_OtherAssetsNoncurrent | $ 2,865,941 us-gaap_OtherAssetsNoncurrent

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- Definition Image use rights net non current. + References No definition available. + Details
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Namespace Prefix: | omex_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Recovered cargo non current. + References No definition available. + Details
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Namespace Prefix: | omex_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Aggregate carrying amount, as of the balance sheet date, of noncurrent assets not separately disclosed in the balance sheet. Noncurrent assets are expected to be realized or consumed after one year (or the normal 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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant