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Concentration of Credit Risk - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015 Institution
Concentration Of Credit Risk [Line Items]
Uninsured cash balance	$ 859,000us-gaap_CashUninsuredAmount
Number of financial institutions in which cash is deposited	1omex_NumberOfFinancialInstitutionsInWhichCashDeposited
Mortgages Payable [Member]
Concentration Of Credit Risk [Line Items]
Basis spread on variable rate, points	0.01%omex_DebtInstrumentBasisSpreadOnVariableRatePoints / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember
Interest obligation from basis points variation, per month	852omex_InterestObligationFromBasisPointVariation / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember
Credit risk maturity period	2016-07
Term Loan [Member]
Concentration Of Credit Risk [Line Items]
Interest obligation from basis points variation, per month	2,436omex_InterestObligationFromBasisPointVariation / us-gaap_LongtermDebtTypeAxis = omex_TermLoanMember
Basis spread on variable rate, points	0.01%us-gaap_DebtInstrumentInterestRateIncreaseDecrease / us-gaap_LongtermDebtTypeAxis = omex_TermLoanMember
Project Term Loans [Member]
Concentration Of Credit Risk [Line Items]
Interest obligation from basis points variation, per month	$ 6,510omex_InterestObligationFromBasisPointVariation / us-gaap_LongtermDebtTypeAxis = omex_ProjectTermLoanMember

X

- Details

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

X

- Definition

Debt instrument basis spread on variable rate points.

+ References

No definition available.

+ Details

Name:	omex_DebtInstrumentBasisSpreadOnVariableRatePoints
Namespace Prefix:	omex_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Interest obligation from basis point variation.

+ References

No definition available.

+ Details

Name:	omex_InterestObligationFromBasisPointVariation
Namespace Prefix:	omex_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Maturity period of concentration of credit risk.

+ References

No definition available.

+ Details

Name:	omex_MaturityPeriodOfConcentrationOfCreditRisk
Namespace Prefix:	omex_
Data Type:	xbrli:gYearMonthItemType
Balance Type:	na
Period Type:	duration

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

- Definition

Incremental percentage increase (decrease) in the stated rate on a debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentInterestRateIncreaseDecrease
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=omex_ProjectTermLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=omex_TermLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_MortgagesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: