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Accounts Receivable - Summary of Accounts Receivable (Detail) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Reserve for doubtful accounts receivable $ (4,631,593)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ (5,131,593)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Accounts receivable, net 6,476,049us-gaap_AccountsReceivableNetCurrent 207,005us-gaap_AccountsReceivableNetCurrent
Trade [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable, gross 11,053,118us-gaap_AccountsReceivableGrossCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_TradeAccountsReceivableMember
4,808,678us-gaap_AccountsReceivableGrossCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_TradeAccountsReceivableMember
Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable, gross $ 54,524us-gaap_AccountsReceivableGrossCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= omex_OtherAccountsReceivableMember
$ 529,920us-gaap_AccountsReceivableGrossCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= omex_OtherAccountsReceivableMember