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Mortgage and Loans Payable - Schedule of Consolidated Debt (Detail) (USD $) | Sep. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Debt Instrument [Line Items] |  |
Company's consolidated debt | $ 17,344,071 | $ 22,031,808
Term Loan [Member] |  |
Debt Instrument [Line Items] |  |
Company's consolidated debt | 4,000,000 | 5,000,000
Project Term Loans [Member] |  |
Debt Instrument [Line Items] |  |
Company's consolidated debt | 11,642,772 | 10,000,000
Face Value $8,000,000, 9% Convertible Senior Note Payable [Member] |  |
Debt Instrument [Line Items] |  |
Company's consolidated debt |  | 4,039,446
Mortgages Payable [Member] |  |
Debt Instrument [Line Items] |  |
Company's consolidated debt | 1,701,299 | 1,816,286
Face Value $10,000,000, 8% Convertible Senior Note Payable [Member] |  |
Debt Instrument [Line Items] |  |
Company's consolidated debt |  | $ 1,176,076

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Namespace Prefix: | omex_
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Balance Type: | credit
Period Type: | instant

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