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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Property, Plant and Equipment [Line Items]          
Number of shares sold         24,000,000
Proceeds from sale of subsidiary stock       $ 25,000,000 $ 27,500,000
Operating expenses 7,923,887 8,999,181 23,353,615 30,204,201  
Ratio of remaining net proceed     0.25    
Percentage of cash proceeds from monetization of recovered cargo     80.00%    
Percentage of subsequent cash proceeds after priority recoupment     45.00%    
Short-term investment maturity period     Three months or less    
Weighted average number of common shares outstanding 85,271,429 80,252,203 84,707,367 78,991,192  
Gairsoppa [Member]
          
Property, Plant and Equipment [Line Items]          
Operating expenses     0    
Dorado Discovery Charter [Member]
          
Property, Plant and Equipment [Line Items]          
Impairment losses included in depreciation at the time of impairment, depreciation was accelerated due to the termination $ 1,700,000        
Receiver [Member]
          
Property, Plant and Equipment [Line Items]          
Percentage of cash proceeds from monetization of recovered cargo     20.00%    
Percentage of subsequent cash proceeds after priority recoupment     55.00%    
Minimum [Member]
          
Property, Plant and Equipment [Line Items]          
Property and Equipment, estimated useful life     3 years    
Maximum [Member]
          
Property, Plant and Equipment [Line Items]          
Property and Equipment, estimated useful life     10 years