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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 |  |

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