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Loans Payable - Note 2 - Monaco 2016 - Additional Information (Detail)
 1 Months Ended 3 Months Ended
Dec. 10, 2015
USD ($)
Mar. 31, 2016
USD ($)
Installment
$ / shares
shares
Mar. 31, 2017
USD ($)
Mar. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
Dec. 31, 2013
$ / shares
May 10, 2012
USD ($)
Debt Instrument [Line Items]              
Aggregate amount issuable             $ 8,000,000
Equipment carrying value     $ 17,188,699   $ 17,188,699    
Expected interest expenses     714,896 $ 334,060      
Loans payable     25,941,724   25,067,308    
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 $ 1,825,000      
Interest rate, stated percentage   10.00%   10.00%      
Debt instrument maturity date   Apr. 15, 2018          
Outstanding notes balance     1,825,000        
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   $ 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    
Equipment carrying value   $ 1,500,000   $ 1,500,000      
Loan Modification [Member]              
Debt Instrument [Line Items]              
Conversion price of Notes | $ / shares   $ 1.00   $ 1.00      
BCF amount recorded     456,250        
Expected interest expenses     56,222 $ 9,722      
Accrued interest     $ 45,000 6,774      
Loans payable   $ 2,800,000   2,800,000      
Debt component in loans payable   1,450,397   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   $ 1,349,603      
Loan Modification [Member] | Monaco [Member]              
Debt Instrument [Line Items]              
Number of options eliminated under share purchase option | shares   3,174,603   3,174,603      
Per share value of shares purchased by private investor | $ / shares   $ 3.15   $ 3.15