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Commitments and Contingencies - Additional Information (Detail) (USD $) Share data in Millions, unless otherwise specified | 1 Months Ended | 9 Months Ended |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | ---
Sep. 26, 2013 | Nov. 15, 2012 | Apr. 16, 2012 | Sep. 30, 2013 | Jul. 31, 2013 | Sep. 30, 2013 Fixed Price Swap Hedge [Member] Contract | Sep. 30, 2013 Fixed Price Swap First Contract [Member] oz | Sep. 30, 2013 Fixed Price Swap Second Contract [Member] oz | Sep. 30, 2013 Third Party [Member]
Gain Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Fees and costs |  | $ 130,000 |  |  |  |  |  |  |
Excess of claim |  |  | 3,000,000 |  |  |  |  |  |
Attorney fees | 1,072,979 |  |  |  |  |  |  |  |
Marketing, general and administrative expenses |  |  |  | 942,979 |  |  |  |  |
Charter agreement period |  |  |  | 90 days |  |  |  |  |
Project financing |  |  |  |  |  |  |  |  | 37,000,000
Minimum expected monetize amount |  |  |  | 30,000,000 |  |  |  |  |
Bank borrowing |  |  |  |  | 10,000,000 |  |  |  |
Oceanica Resources investments held by subsidiary |  |  |  | $ 17,500,000 |  |  |  |  |
Option to purchase outstanding shares of Oceanica Resources held by subsidiary |  |  |  | 7 |  |  |  |  |
Number of contracts entered |  |  |  |  |  | 2 |  |  |
Weight of troy ounce for first contract |  |  |  |  |  |  | 250,000 | 250,000 |
Weight of troy ounce for first contract price per share |  |  |  |  |  |  | 24.40 | 23.10 |
Weight of troy ounce difference multiplied description |  |  |  |  |  | If the average silver price is less than the fixed price, we receive the difference multiplied by the 250,000 troy ounces. If the average silver price is greater than the fixed price, we owe the difference multiplied by the 250,000 troy ounces. |  |  |

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