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Income Taxes - Schedule of Income (Loss) Before Income Taxes (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income Tax Disclosure [Abstract] |  |  |
Expected (benefit) | $ (9,908,804)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | $ (3,483,374)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | $ (6,180,388)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Effects of: |  |  |
U.S. income tax expense at the AMT 20% rate |  | (176,839)omex_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtAlternativeMinimumTaxRate |
State income taxes net of federal benefits | (294,933)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | 509,495 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | (181,423)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Nondeductible expense | (126,601)us-gaap_IncomeTaxReconciliationNondeductibleExpense | 31,640 us-gaap_IncomeTaxReconciliationNondeductibleExpense | 17,994 us-gaap_IncomeTaxReconciliationNondeductibleExpense
Stock options and restricted stock awards |  | 790,011 us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost | 223,720 us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost
Derivatives |  | (783,994)omex_IncomeTaxReconciliationDeductionsDerivatives | 322,848 omex_IncomeTaxReconciliationDeductionsDerivatives
Change in valuation allowance | 10,469,108 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | (6,276,369)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | 5,385,732 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Change in net operating loss |  |  | 832,408 omex_IncomeTaxReconciliationChangeInNetOperatingLossEstimate
CFC Dividend Income |  | 9,190,723 omex_IncomeTaxReconciliationControlledForeignCorporationDividendIncome | (374,051)omex_IncomeTaxReconciliationControlledForeignCorporationDividendIncome
Change in rate estimate |  | 15,767 us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate | (42,925)us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate
Foreign Rate Differential | (138,770)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential | 662,745 us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential |
Reversal of Prior Year AMT Accrual | (481,055)us-gaap_IncomeTaxReconciliationDeductionsOther |  |
Other, net |  | 16,250 us-gaap_IncomeTaxReconciliationOtherAdjustments | (3,915)us-gaap_IncomeTaxReconciliationOtherAdjustments
Income tax provision (benefit) | $ (481,055)us-gaap_IncomeTaxExpenseBenefit | $ 496,055 us-gaap_IncomeTaxExpenseBenefit |

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