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Property and Equipment - Additional Information (Detail) (USD $)	12 Months Ended			6 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Depreciation charge	$ 5,510,909us-gaap_Depreciation	$ 1,937,641us-gaap_Depreciation	$ 1,589,133us-gaap_Depreciation
Dorado Discovery Vessel [Member]
Property, Plant and Equipment [Line Items]
Depreciation charge				$ 3,000,000us-gaap_Depreciation / us-gaap_BusinessAcquisitionAxis = omex_DoradoDiscoveryVesselMember

X

- Definition

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Details

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

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=omex_DoradoDiscoveryVesselMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: