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Other Long-Term Assets - Additional Information (Detail)	Dec. 31, 2015 USD ($)
Other Long Term Assets [Line Items]
Deposits for conservation and documentation of artifacts	$ 100,000
UNITED KINGDOM
Other Long Term Assets [Line Items]
Deposits with United Kingdom's Ministry of Defense	$ 432,500

X

- Definition

Deposits to fund conservation and documentation.

+ References

No definition available.

+ Details

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Namespace Prefix:	omex_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Deposits with ministry of defense.

+ References

No definition available.

+ Details

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Namespace Prefix:	omex_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Other long term assets.

+ References

No definition available.

+ Details

Name:	omex_OtherLongTermAssetsLineItems
Namespace Prefix:	omex_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_StatementGeographicalAxis=country_GB
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: