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Inventory - Schedule of Inventory (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Inventory Disclosure [Abstract]
Recovered cargo	$ 5,681,264omex_RetailRelatedRecoveredCargo	$ 5,406,183omex_RetailRelatedRecoveredCargo
Packaging	70,560us-gaap_RetailRelatedInventoryPackagingAndOtherSupplies	85,133us-gaap_RetailRelatedInventoryPackagingAndOtherSupplies
Merchandise	405,467us-gaap_RetailRelatedInventoryMerchandise	401,072us-gaap_RetailRelatedInventoryMerchandise
Merchandise reserve	(371,332)us-gaap_InventoryValuationReserves	(371,332)us-gaap_InventoryValuationReserves
Total Inventory (current and non-current)	$ 5,785,959omex_InventoryCurrentAndNonCurrentNet	$ 5,521,056omex_InventoryCurrentAndNonCurrentNet

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Retail related recovered cargo.

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Amount of valuation reserve for inventory.

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