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Commitments and Contingencies - Additional Information (Detail) (USD $) | 12 Months Ended | 0 Months Ended | 1 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Mar. 11, 2015 | Mar. 09, 2015 | Feb. 28, 2011 | Dec. 31, 2011 | Dec. 09, 2002 | May 26, 1998
Gain Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Deferred income from revenue participation rights |  | $ (555,064)omex_DeferredIncomeFromRevenueParticipationRights | $ (4,465,868)omex_DeferredIncomeFromRevenueParticipationRights |  |  |  |  |  |
Income derived from Cambridge RPC's | 12,986 omex_PaymentForOneTimeRevenueDistribution |  |  |  |  |  |  |  |
Post finance cost proceeds |  |  |  |  |  |  |  | 5.00%omex_PercentageOfProceedsFromShipwrecksReceivableUnderAgreement | 5.00%omex_PercentageOfProceedsFromShipwrecksReceivableUnderAgreement
Non-restricted cash balance | 3,143,550 us-gaap_CashAndCashEquivalentsAtCarryingValue | 21,322,257 us-gaap_CashAndCashEquivalentsAtCarryingValue | 10,096,414 us-gaap_CashAndCashEquivalentsAtCarryingValue |  |  |  | 7,971,794 us-gaap_CashAndCashEquivalentsAtCarryingValue |  |
Working capital deficit | 7,600,000 omex_WorkingCapitalDeficit |  |  |  |  |  |  |  |
Bank loan amount | 7,700,000 us-gaap_BankLoans |  |  |  |  |  |  |  |
Bank loan maturity period | 2015 |  |  |  |  |  |  |  |
Total assets | 25,089,539 us-gaap_Assets | 51,460,607 us-gaap_Assets |  |  |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Gain Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Minimum bid price |  |  |  |  | $ 1.00 omex_CommonStockMinimumBidPrice / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |
Number of consecutive business days not complied with minimum bid price |  |  |  |  | 30 days |  |  |  |
Number of days afforded to regain compliance with minimum bid price requirement |  |  |  |  | 180 days |  |  |  |
Loans amount |  |  |  | 14,800,000 omex_LoansAndLeasesReceivableNetReportedAmountRelatedToPurchasedCreditImpairedLoans / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |  |
Period to purchase additional preferred shares |  |  |  | 5 years |  |  |  |  |
Seattle and Cambridge Projects [Member] |  |  |  |  |  |  |  |  |
Gain Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Deferred income from revenue participation rights | 887,500 omex_DeferredIncomeFromRevenueParticipationRights / us-gaap_DeferredRevenueArrangementTypeAxis = omex_SeattleAndCambridgeProjectsMember |  |  |  |  |  |  |  |
Galt Resources [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Gain Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Investment for future revenue rights |  |  |  |  |  | $ 7,512,500 omex_InvestmentForFutureRevenueRights / us-gaap_ExtinguishmentOfDebtAxis = omex_GaltResourcesMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |

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