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Concentration of Credit Risk - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2016 USD ($) Institution
Debt Disclosure [Abstract]
Uninsured cash balance	$ 2,533,137
Number of financial institutions in which cash is deposited | Institution	1
Debt obligations with variable interest rates	$ 0

X

- Definition

Number of financial institutions in which cash deposited.

+ References

No definition available.

+ Details

Name:	omex_NumberOfFinancialInstitutionsInWhichCashDeposited
Namespace Prefix:	omex_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of cash as of the balance sheet date that is not insured by the Federal Deposit Insurance Corporation.

+ References

No definition available.

+ Details

Name:	us-gaap_CashUninsuredAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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

X

- Definition

The portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time.

+ References

No definition available.

+ Details

Name:	us-gaap_LongtermDebtPercentageBearingVariableInterestAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant