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Loans Payable - Project Term Loan - Additional Information (Detail)				1 Months Ended	3 Months Ended			4 Months Ended	9 Months Ended		12 Months Ended
	Mar. 18, 2016 USD ($) $ / shares shares	Dec. 10, 2015 USD ($)	May 11, 2015 USD ($)	Mar. 31, 2016 USD ($) Installment $ / shares shares	Sep. 30, 2016 USD ($) $ / shares	Mar. 31, 2016 USD ($) $ / shares shares	Sep. 30, 2015 USD ($)	Jun. 30, 2015 Tranches	Sep. 30, 2016 USD ($) Subsidiaries $ / shares shares	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)	Oct. 01, 2015	Mar. 11, 2015 USD ($)	Oct. 01, 2014 USD ($)	Aug. 14, 2014 USD ($)	Dec. 31, 2013 $ / shares	May 10, 2012 USD ($)
Debt Instrument [Line Items]
Aggregate amount issuable																	$ 8,000,000
Expected interest expenses					$ 598,931		$ 1,206,662		$ 1,529,278	$ 2,888,386
Loans payable					22,036,460				$ 22,036,460		$ 18,199,632
Share repurchase agreement expiration date									Mar. 30, 2016
Promissory note outstanding amount					14,750,000				$ 14,750,000
Call option expiration date									Mar. 11, 2016
Derivative, fixed value					40,000,000				$ 40,000,000
Estimated market rate loan percentage									15.00%
Debt discount amount					383,148				$ 383,148
Oceanica Call Option (MINOSA) [Member]
Debt Instrument [Line Items]
Stock granted during period, value			$ 40,000,000						$ 40,000,000
Stock granted during period, percentage			54.00%						54.00%
Monaco Notes [Member]
Debt Instrument [Line Items]
Aggregate amount issuable					2,800,000				$ 2,800,000
Expected interest expenses									0
Notes payable, carrying value					$ 3,449,632				$ 3,449,632
Oceanica Resources S. de. R.L [Member]
Debt Instrument [Line Items]
Per share value of shares purchased by private investor | $ / shares																$ 2.50
Promissory Note [Member]
Debt Instrument [Line Items]
Debt instrument maturity date									Mar. 18, 2017
Interest rate, stated percentage					8.00%				8.00%
Call option			$ 14,750,000
Accrued interest									$ 960,950
Promissory Note [Member] | Stock Purchase Agreement [Member] | MINOSA [Member]
Debt Instrument [Line Items]
Number of advances | Tranches								5
Promissory Note [Member] | Stock Purchase Agreement [Member] | Maximum [Member] | MINOSA [Member]
Debt Instrument [Line Items]
Call option													$ 14,750,000
Promissory Note [Member] | Oceanica Resources S. de. R.L [Member]
Debt Instrument [Line Items]
Call option					$ 14,750,000				14,750,000
First Tranche [Member] | Promissory Note [Member] | Oceanica Resources S. de. R.L [Member]
Debt Instrument [Line Items]
Call option					2,000,000				2,000,000
Second Tranche [Member] | Promissory Note [Member] | Oceanica Resources S. de. R.L [Member]
Debt Instrument [Line Items]
Call option					6,000,000				6,000,000
Third Tranche [Member] | Promissory Note [Member] | Oceanica Resources S. de. R.L [Member]
Debt Instrument [Line Items]
Call option					$ 3,000,000				$ 3,000,000
NoteOneMonacoTwoThousandForteen [Member]
Debt Instrument [Line Items]
Aggregate amount issuable															$ 10,000,000
Number of wholly owned subsidiaries | Subsidiaries									2
Debt instrument, number of shares | shares									100,000
Debt instrument, Value of shares									$ 250,000
Amortization of components included in interest expense											1,895,263
Marketing program compensation expenses, percentage yet to be recognized									5.00%
NoteOneMonacoTwoThousandForteen [Member] | Minimum [Member]
Debt Instrument [Line Items]
Initial principal amount of note, percent									50.00%
NoteOneMonacoTwoThousandForteen [Member] | Maximum [Member]
Debt Instrument [Line Items]
Initial principal amount of note, percent									100.00%
NoteOneMonacoTwoThousandForteen [Member] | Oceanica Resources S. de. R.L [Member]
Debt Instrument [Line Items]
Shares issued to lender | shares									100,000
Per share value of shares purchased by private investor | $ / shares					$ 3.15				$ 3.15
Aggregate value of shares issued to lender									$ 1,000,000
NoteOneMonacoTwoThousandForteen [Member] | Loan Modification March Two Thousand Sixteen [Member] | Oceanica Resources S. de. R.L [Member]
Debt Instrument [Line Items]
Per share value of shares purchased by private investor | $ / shares				$ 1.00		$ 1.00
NoteOneMonacoTwoThousandForteen [Member] | First Tranche [Member]
Debt Instrument [Line Items]
Loan amount borrowed															5,000,000
Unused borrowing capacity															5,000,000
Call option					$ 5,000,000				5,000,000
NoteOneMonacoTwoThousandForteen [Member] | Second Tranche [Member]
Debt Instrument [Line Items]
Aggregate amount issuable														$ 2,500,000
Unused borrowing capacity															2,500,000
Interest rate, stated percentage												11.00%		8.00%
Call option					2,500,000				2,500,000
NoteOneMonacoTwoThousandForteen [Member] | Third Tranche [Member]
Debt Instrument [Line Items]
Unused borrowing capacity															$ 2,500,000
Call option					2,500,000				2,500,000
NoteOneMonacoTwoThousandForteen [Member] | Amended Promissory Notes [Member]
Debt Instrument [Line Items]
Extinguishment of debt, amount											2,200,000
Notes ceased to bear interest, amount											$ 5,000,000
Debt instrument maturity date											Dec. 31, 2017
Outstanding notes balance											$ 2,800,000
Long term notes					2,800,000				2,800,000
Loan Modification [Member]
Debt Instrument [Line Items]
Conversion price of Notes | $ / shares				$ 1.00		$ 1.00
BCF amount recorded									456,250
Expected interest expenses									$ 112,514
Loans payable				$ 2,800,000		$ 2,800,000
Debt component in loans payable				1,450,397		1,450,397
Loan Modification [Member] | Oceanica Resources S. de. R.L [Member]
Debt Instrument [Line Items]
Debt instrument maturity date									Dec. 31, 2017
Call option		$ 10,000,000
Equity component in loans payable				$ 1,349,603		$ 1,349,603
Loan Modification [Member] | Monaco [Member]
Debt Instrument [Line Items]
Per share value of shares purchased by private investor | $ / shares				$ 3.15		$ 3.15
Number of options eliminated under share purchase option | shares				3,174,603		3,174,603
Loan Modification [Member] | First Tranche [Member]
Debt Instrument [Line Items]
Call option		$ 5,000,000
Agreement description									Monaco agreed to cease interest as of December 10, 2015 and reduce the loan balance by (i) the cash or other value received by Monaco from the SS Central America shipwreck project (“SSCA”) or (ii) if the proceeds received by Monaco from the SSCA project are insufficient to pay off the loan balance by December 31, 2017, then Monaco can seek repayment of the remaining outstanding balance on the loan by withholding Odyssey’s 21.25% “additional consideration” in new shipwreck projects performed for Monaco in the future.
Additional consideration percentage		21.25%
Loan Modification [Member] | Second Tranche [Member]
Debt Instrument [Line Items]
Aggregate amount issuable		$ 300,000
Debt instrument maturity date		Dec. 31, 2017
Call option		$ 2,500,000
Reduced principal amount		$ 2,200,000
Loan Modification [Member] | Third Tranche [Member]
Debt Instrument [Line Items]
Debt instrument maturity date		Dec. 31, 2017
Call option		$ 2,500,000
Note 2 [Member]
Debt Instrument [Line Items]
Aggregate amount issuable				$ 1,825,000		$ 1,825,000
Debt instrument maturity date						Apr. 01, 2018
Interest rate, stated percentage				10.00%		10.00%
Note 2 [Member] | Monaco Notes [Member]
Debt Instrument [Line Items]
Aggregate amount issuable					2,800,000				$ 2,800,000
Fair value					3,617,859				3,617,859
Equity component in loans payable					1,063,487				1,063,487
Note 2 [Member] | Oceanica Resources S. de. R.L [Member]
Debt Instrument [Line Items]
Conversion price of Notes | $ / shares				$ 1.00		$ 1.00
Note 2 [Member] | Exploraciones Oceanicas [Member]
Debt Instrument [Line Items]
Aggregate amount issuable				$ 18,000,000		$ 18,000,000
Debt instrument maturity date				Sep. 25, 2015
Note 2 [Member] | Oceanica Marine Operations [Member]
Debt Instrument [Line Items]
Aggregate amount issuable				$ 9,300,000		9,300,000
Debt instrument term				30 days
Aggregate consideration payable				$ 1,800,000		1,800,000
Debt instrument number of installments | Installment				10
Installment amount of Notes				$ 750,000		$ 750,000
Fair value					0				0
Notes Payable, Other Payables [Member] | Epsilon Acquisitions, LLC [Member]
Debt Instrument [Line Items]
Aggregate amount issuable	$ 3,000,000
Debt instrument maturity date	Mar. 18, 2017
Interest rate, stated percentage	10.00%
Conversion price of Notes | $ / shares	$ 5.00
Installment amount of Notes	$ 1,500,000
BCF amount recorded									$ 96,000
Notes security description									We granted security interests to Epsilon in (a) the 54 million cuotas (a unit of ownership under Panamanian law) of Oceanica Resources S. de R.L. (“Oceanica”) held by our wholly owned subsidiary, Odyssey Marine Enterprises, Ltd. (“OME”), (b) all notes and other receivables from Oceanica and its subsidiary owed to the Odyssey Pledgors, and (c) all of the outstanding equity in OME.
Conversion price of Notes upon default | $ / shares	$ 2.50
Security deposit liability	$ 54,000,000
Number of trading days	75 days
Outstanding principal of the note					3,050,000				$ 3,050,000
Lender's out of pocket costs					$ 50,000				$ 50,000
Debt Instrument, acceleration clause description									The obligations under the Restated Note may be accelerated upon the occurrence of specified events of default including (a) OME’s failure to pay any amount payable under the Restated Note on the date due and payable; (b) OME’s or our failure to perform or observe any term, covenant, or agreement in the Restated Note or the related documents, subject to a five-day cure period; (c) the occurrence and expiration of all applicable grace periods, if any, of an event of default or material breach by OME, us or any of our affiliates under any of the other loan documents; (d) the termination of the Stock Purchase Agreement; (e) commencement of certain specified dissolution, liquidation, insolvency, bankruptcy, reorganization, or similar cases or actions by or against OME or any of its subsidiaries, in specified circumstances unless dismissed or stayed within 60 days; (f) the entry of a judgment or award against OME or any of its subsidiaries in excess of $100,000; and (g) the occurrence of a change in control (as defined in the Restated Note).
Interest expenses related to debt discount recorded									$ 51,195
Notes Payable, Other Payables [Member] | MINOSA [Member]
Debt Instrument [Line Items]
Aggregate amount issuable	$ 14,750,000
Debt instrument, number of shares | shares	100,000
Debt Instrument, acceleration clause description									The indebtedness may be accelerated upon the occurrence of specified events of default including (a) OME’s failure to pay any amount payable on the date due and payable; (b) OME or we fail to perform or observe any term, covenant, or agreement in the Purchase Agreement or the related documents, subject to a five-day cure period; (c) an event of default or material breach by OME, us or any of our affiliates under any of the other loan documents shall have occurred and all grace periods, if any, applicable thereto shall have expired; (d) the Stock Purchase Agreement shall have been terminated; (e) specified dissolution, liquidation, insolvency, bankruptcy, reorganization, or similar cases or actions are commenced by or against OME or any of its subsidiaries, in specified circumstances unless dismissed or stayed within 60 days; (f) the entry of judgment or award against OME or any of its subsidiaries in excess or $100,000; and (g) a change in control (as defined in the Purchase Agreement) occurs.

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The price per share of the conversion feature embedded in the debt instrument.

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Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instruments must exceed threshold percentage for a specified number of trading days to trigger conversion feature, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Identification of the lender and information about a contractual promise to repay a short-term or long-term obligation, which includes borrowings under lines of credit, notes payable, commercial paper, bonds payable, debentures, and other contractual obligations for payment. This may include rationale for entering into the arrangement, significant terms of the arrangement, which may include amount, repayment terms, priority, collateral required, debt covenants, borrowing capacity, call features, participation rights, conversion provisions, sinking-fund requirements, voting rights, basis for conversion if convertible and remarketing provisions. The description may be provided for individual debt instruments, rational groupings of debt instruments, or by debt in total.

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Face (par) amount of debt instrument at time of issuance.

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Increase for accrued, but unpaid interest on the debt instrument for the period.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Description of a subjective acceleration clause that is a part of the debt instrument. A subjective acceleration clause is a provision in a debt agreement that states that the creditor may accelerate the scheduled maturities of the obligation under conditions that are not objectively determinable (for example, if the debtor fails to maintain satisfactory operations or if a material adverse change occurs).

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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No definition available.

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Amount, after accumulated amortization, of debt discount.

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Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Fair value of the assets less the liabilities of a derivative or group of derivatives.

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Gross amount of debt extinguished.

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Amount of the cost of borrowed funds accounted for as interest expense.

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Date the credit facility first became available, in CCYY-MM-DD format.

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Including the current and noncurrent portions, aggregate carrying value as of the balance sheet date of loans payable (with maturities initially due after one year or beyond the operating cycle if longer).

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The carrying value as of the balance sheet date of the noncurrent portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Carrying value as of the balance sheet date of notes payable (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion.

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Amount of consideration received by subsidiary or equity investee in exchange for shares of stock issued or sold. Includes amount of cash received, fair value of noncash assets received, and fair value of liabilities assumed by the investor.

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No definition available.

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The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

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Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

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This element represents money paid in advance to protect the provider of a product or service, such as a lessor, against damage or nonpayment by the buyer or tenant (lessee) during the term of the agreement. Such damages may include physical damage to the property, theft of property, and other contractual breaches. Security deposits held may be interest or noninterest bearing.

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