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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.