Derivative Financial Instruments - Significant Assumptions Utilized in Binomial Lattice Process (Parenthetical) (Detail)	May 10, 2012	Nov. 08, 2011	Jun. 30, 2014 Level 3 [Member]
Derivative [Line Items]
Shares available for issuance upon exercise	434,027	434,027	434,027

Number of securities called by warrants or rights upon additional financing.

No definition available.

Name:	omex_NumberOfSecuritiesCalledByWarrantsOrRightsUponAdditionalFinancing
Namespace Prefix:	omex_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant