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Income Taxes - Additional Information (Detail) (USD $)
 3 Months Ended
Mar. 31, 2015
Income Taxes [Line Items]  
Net deferred tax asset $ 0us-gaap_DeferredTaxAssetsLiabilitiesNet
Income tax expense 0us-gaap_CurrentFederalTaxExpenseBenefit
Dividend from subsidiaries 10,200,000omex_DividendsReceivedFromSubsidiary
Estimated annual effective tax rate 34.84%omex_EstimatedAnnualEffectiveTaxRate
Effective tax rate 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Federal [Member]  
Income Taxes [Line Items]  
Net operating loss carryforwards during the period 9,300,000omex_OperatingLossCarryforwardsArisingDuringPeriod
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
Net operating loss carryforwards 138,400,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
Net operating loss carryforwards expiration year 2025
Net operating loss carryforwards expiration year 2035
Foreign [Member]  
Income Taxes [Line Items]  
Net operating loss carryforwards during the period 900,000omex_OperatingLossCarryforwardsArisingDuringPeriod
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember
Net operating loss carryforwards $ 14,200,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember