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Income Taxes - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Jun. 30, 2014
Income Taxes [Line Items] |  |  |  |
Net operating loss carryforwards subject to expiration | $ 129,118,760 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration |  |  |
Net operating loss carryforwards related to foreign income tax | 13,325,245 us-gaap_OperatingLossCarryforwards |  |  |
Net deferred tax asset | 0 us-gaap_DeferredTaxAssetsLiabilitiesNet |  |  |
Federal income tax rate | 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate |
General carryback period | 2 years |  |  |
Duration of carryback period to 2008 tax year | 5 years |  |  |
Cash tax benefit | 0 omex_FederalTaxBenefitRelatedToOperatingLossCarryforwards |  |  |
Percentage of future alternative minimum taxable income | 100.00%omex_NetOperatingLossCarriedForwardAvailableForOffsettingAgainstFutureTaxableIncomePercentage |  |  |
Original offsetting percentage of future alternative minimum taxable income | 90.00%omex_NetOperatingLossCarriedForwardAvailableForOffsettingAgainstFutureTaxableIncomePercentageAsOriginal |  |  |
Income tax benefit | (481,055)us-gaap_IncomeTaxExpenseBenefit | 496,055 us-gaap_IncomeTaxExpenseBenefit |  |
Reversal of AMT [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Income tax benefit |  |  |  | 481,055 us-gaap_IncomeTaxExpenseBenefit / us-gaap_TaxCreditCarryforwardAxis = omex_ReversalOfAlternativeMinimumTaxMember
2025 Through 2027 [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating loss carryforwards subject to expiration | 43,000,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration / us-gaap_IncomeTaxAuthorityAxis = omex_OperatingLossCarryforwardsExpiringTwoThousandAndTwentyFiveThroughTwoThousandAndTwentySevenMember |  |  |
2028 Through 2034 [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating loss carryforwards subject to expiration | $ 86,000,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration / us-gaap_IncomeTaxAuthorityAxis = omex_OperatingLossCarryforwardsExpiringTwoThousandAndTwentyEightThroughTwoThousandAndThirtyFourMember |  |  |
Start [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating loss carryforwards expiration year | 2025 |  |  |
End [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating loss carryforwards expiration year | 2034 |  |  |

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