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Loans Payable - Note 2 - Monaco 2016 - Additional Information (Detail)		1 Months Ended		12 Months Ended
	Dec. 10, 2015 USD ($)	Aug. 31, 2016	Mar. 31, 2016 USD ($) Installment $ / shares shares	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 $ / shares	May 10, 2012 USD ($)
Debt Instrument [Line Items]
Aggregate amount issuable								$ 8,000,000
Debt instrument maturity date		Aug. 31, 2018
Equipment carrying value				$ 17,188,699	$ 22,460,256
Expected interest expenses				2,396,994	4,551,799	$ 1,560,254
Additional consideration percentage	21.25%
Loans payable				25,067,308	$ 18,199,632
Monaco Notes [Member]
Debt Instrument [Line Items]
Aggregate amount issuable				2,800,000
Expected interest expenses				0
Notes payable, carrying value				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
Note 2 [Member]
Debt Instrument [Line Items]
Aggregate amount issuable			$ 1,825,000	1,825,000
Interest rate, stated percentage			10.00%
Debt instrument maturity date			Apr. 15, 2018
Accrued interest				143,774
Note 2 [Member] | Monaco Notes [Member]
Debt Instrument [Line Items]
Aggregate amount issuable				2,800,000
Fair value				3,617,858
Equity component in loans payable				1,063,487
Note 2 [Member] | Oceanica Resources S. de. R.L [Member]
Debt Instrument [Line Items]
Conversion price of Notes | $ / shares			$ 1.00
Note 2 [Member] | Exploraciones Oceanicas [Member]
Debt Instrument [Line Items]
Aggregate amount issuable			$ 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
Equipment carrying value			$ 1,700,000
Debt instrument term			30 days
Aggregate consideration payable			$ 1,800,000
Debt instrument number of installments | Installment			10
Installment amount of Notes			$ 750,000
Fair value				0
Loan Modification [Member]
Debt Instrument [Line Items]
Conversion price of Notes | $ / shares			$ 1.00
BCF amount recorded				456,250
Expected interest expenses				$ 166,750
Loans payable			$ 2,800,000
Debt component in loans payable			1,450,397
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
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
Loan Modification [Member] | Monaco [Member]
Debt Instrument [Line Items]
Number of options eliminated under share purchase option | shares			3,174,603
Per share value of shares purchased by private investor | $ / shares			$ 3.15

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