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Loans Payable - Note 2 - Monaco 2016 - Additional Information (Detail)
 1 Months Ended 3 Months Ended 9 Months Ended
Dec. 10, 2015
USD ($)
Mar. 31, 2016
USD ($)
Installment
$ / shares
shares
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2013
$ / shares
May 10, 2012
USD ($)
Debt Instrument [Line Items]                    
Aggregate amount issuable                   $ 8,000,000
Equipment carrying value     $ 16,738,898     $ 16,738,898   $ 17,188,699    
Cash proceeds from sale of vessel           80,000 $ 200,000      
Loans payable     26,150,524     26,150,524   25,067,308    
Expected interest expenses     638,940   $ 598,931 2,018,570 $ 1,529,278      
Marine Vessel [Member]                    
Debt Instrument [Line Items]                    
Cash proceeds from sale of vessel       $ 650,000            
Loans payable       650,000            
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  
Note 2 [Member]                    
Debt Instrument [Line Items]                    
Aggregate amount issuable   $ 1,825,000                
Interest rate, stated percentage   10.00%                
Debt instrument maturity date   Apr. 15, 2018                
Outstanding notes balance     1,175,000     1,175,000        
Loans payable       650,000            
Note 2 [Member] | Marine Vessel [Member]                    
Debt Instrument [Line Items]                    
Cash proceeds from sale of vessel       $ 650,000            
Note 2 [Member] | Monaco Notes [Member]                    
Debt Instrument [Line Items]                    
Aggregate amount issuable     2,800,000     2,800,000        
Fair value     3,617,858     3,617,858        
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                
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                
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    
Equipment carrying value   $ 900,000                
Loan Modification [Member]                    
Debt Instrument [Line Items]                    
Conversion price of Notes | $ / shares   $ 1.00                
Loans payable   $ 2,800,000                
BCF amount recorded           456,250        
Remaining BCF amount           $ 76,770        
Expected interest expenses     38,791   52,320          
Accrued interest     $ 29,616   $ 45,000          
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   $ 3,174,603                
Debt instrument, number of shares | shares   3,174,603                
Debt instrument, value of shares   $ 3,174,603                
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