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Mortgage and Loans Payable - Schedule of Disbursement of Promissory Notes (Detail) (USD $) | Mar. 31, 2015
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Debt Instrument [Line Items] |
Proceeds from issuance of promissory note | $ 9,955,000 us-gaap_ConvertibleNotesPayable
Minosa [Member] |
Debt Instrument [Line Items] |
Proceeds from issuance of promissory note | 14,750,000 us-gaap_ConvertibleNotesPayable / us-gaap_LineOfCreditFacilityAxis = omex_MinosaMember
Minosa [Member] | March 11, 2015 (Received March 2015) [Member] |
Debt Instrument [Line Items] |
Proceeds from issuance of promissory note | 2,000,000 us-gaap_ConvertibleNotesPayable / us-gaap_LineOfCreditFacilityAxis = omex_MinosaMember / us-gaap_LongtermDebtTypeAxis = omex_PromissoryNoteIssuedOnMarchElevenTwoThousandFifteenMember
Minosa [Member] | March 31, 2015 (Received April 2015) [Member] |
Debt Instrument [Line Items] |
Proceeds from issuance of promissory note | 6,000,000 us-gaap_ConvertibleNotesPayable / us-gaap_LineOfCreditFacilityAxis = omex_MinosaMember / us-gaap_LongtermDebtTypeAxis = omex_PromissoryNoteIssuedOnMarchThirtyOneTwoThousandFifteenMember
Minosa [Member] | April 30, 2015 (Received April 2015) [Member] |
Debt Instrument [Line Items] |
Proceeds from issuance of promissory note | 3,000,000 us-gaap_ConvertibleNotesPayable / us-gaap_LineOfCreditFacilityAxis = omex_MinosaMember / us-gaap_LongtermDebtTypeAxis = omex_PromissoryNoteIssuedOnAprilThirtyTwoThousandFifteenMember
Minosa [Member] | May 31, 2015 [Member] |
Debt Instrument [Line Items] |
Proceeds from issuance of promissory note | 2,000,000 us-gaap_ConvertibleNotesPayable / us-gaap_LineOfCreditFacilityAxis = omex_MinosaMember / us-gaap_LongtermDebtTypeAxis = omex_PromissoryNoteIssuedOnMayThirtyOneTwoThousandFifteenMember
Minosa [Member] | June 30, 2015 [Member] |
Debt Instrument [Line Items] |
Proceeds from issuance of promissory note | $ 1,750,000 us-gaap_ConvertibleNotesPayable / us-gaap_LineOfCreditFacilityAxis = omex_MinosaMember / us-gaap_LongtermDebtTypeAxis = omex_PromissoryNoteIssuedOnJuneThirtyTwoThousandFifteenMember

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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of a written promise to pay a note, initially due after one year or beyond the operating cycle if longer, which can be exchanged for a specified amount of one or more securities (typically common stock), at the option of the issuer or the holder. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Details
Name: | us-gaap_LineOfCreditFacilityAxis=omex_MinosaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |