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Gain on Silver Fixed Price Swap - Additional Information (Detail) (USD $) | 3 Months Ended | 1 Months Ended
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Dec. 31, 2013 Fixed Price Swap Hedge [Member] Contract | Sep. 30, 2013 Fixed Price Swap Hedge [Member] Contract | Oct. 31, 2013 Fixed Price Swap First Contract [Member] oz | Nov. 30, 2013 Fixed Price Swap Second Contract [Member] oz
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Number of contracts entered | 0 | 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 was less than the fixed price, we would receive the difference multiplied by the 250,000 troy ounces. If the average silver price was greater than the fixed price, we would owe the difference multiplied by the 250,000 troy ounces. |  |
Combined gain from contract | $ 1,206,350 |  |  |

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