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Mortgage and Loans Payable - Schedule of Consolidated Debt (Detail) (USD $) | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Debt Instrument [Line Items] |  |
Company's consolidated debt | $ 22,532,839 | $ 18,820,683
Term Loan [Member] |  |
Debt Instrument [Line Items] |  |
Company's consolidated debt | 5,000,000 | 5,000,000
Project Term Loan [Member] |  |
Debt Instrument [Line Items] |  |
Company's consolidated debt | 10,000,000 |
Face Value $10,000,000, 8% Convertible Senior Note Payable [Member] |  |
Debt Instrument [Line Items] |  |
Company's consolidated debt | 1,716,333 | 8,234,367
Face Value $8,000,000, 9% Convertible Senior Note Payable [Member] |  |
Debt Instrument [Line Items] |  |
Company's consolidated debt | 3,962,053 | 3,628,779
Mortgage Payable [Member] |  |
Debt Instrument [Line Items] |  |
Company's consolidated debt | $ 1,854,453 | $ 1,957,537

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- Definition Mortgage and loans payable current and non current. + References No definition available. + Details
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Namespace Prefix: | omex_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration