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Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jun. 30, 2014
Income Taxes [Line Items]
Net operating loss carryforwards subject to expiration	$ 129,118,760us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration
Net operating loss carryforwards related to foreign income tax	13,325,245us-gaap_OperatingLossCarryforwards
Net deferred tax asset	0us-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	0omex_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	496,055us-gaap_IncomeTaxExpenseBenefit
Reversal of AMT [Member]
Income Taxes [Line Items]
Income tax benefit				481,055us-gaap_IncomeTaxExpenseBenefit / us-gaap_TaxCreditCarryforwardAxis = omex_ReversalOfAlternativeMinimumTaxMember
2025 Through 2027 [Member]
Income Taxes [Line Items]
Net operating loss carryforwards subject to expiration	43,000,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration / us-gaap_IncomeTaxAuthorityAxis = omex_OperatingLossCarryforwardsExpiringTwoThousandAndTwentyFiveThroughTwoThousandAndTwentySevenMember
2028 Through 2034 [Member]
Income Taxes [Line Items]
Net operating loss carryforwards subject to expiration	$ 86,000,000us-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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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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