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Accounts Receivable - Additional Information (Detail) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Mar. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Reserves for doubtful accounts | $ 4,631,593 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent | $ 4,631,593 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Recoupment of operations and research costs | 6,290,465 us-gaap_RecoveryOfDirectCosts |
Neptune Minerals, Inc. [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Reserves for doubtful accounts | $ 4,631,593 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent / us-gaap_BusinessAcquisitionAxis = omex_NeptuneMineralsIncorporatedMember | $ 4,631,593 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent / us-gaap_BusinessAcquisitionAxis = omex_NeptuneMineralsIncorporatedMember

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- Definition A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Return of or reimbursements received in relation to direct costs and expenses previously paid or incurred. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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