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Note 8. Shareholders’ Equity (Detail) (USD $) | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jun. 30, 2011 | Jan. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Apr. 12, 2011 | Dec. 31, 2010 | Jun. 30, 2010 | Sep. 30, 2011 | Sep. 30, 2010
Stock Issued During Period, Shares, New Issues (in Shares) | 7,968 |  |  | 42,636 |  |  | 48,825 |  |
Share-based Compensation | $ 100,000 |  |  |  |  |  |  | $ 1,497,000 | $ 3,336,000
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period (in Shares) | 256,927 |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Restricted Stock Award, Gross (in Shares) | 163,649 |  |  |  |  |  |  |  |
Restricted Stock or Unit Expense | 600,000 |  |  |  |  |  |  |  |
Employee Benefits and Share-based Compensation |  |  |  |  |  |  |  | 1,500,000 | 3,300,000
Stock Repurchased During Period, Shares (in Shares) |  |  |  |  |  |  |  | 56,688 |
Stock Repurchased During Period, Value |  |  |  |  |  |  |  | 500,000 |
Treasury Stock Acquired, Average Cost Per Share (in Dollars per share) |  |  |  |  |  |  |  | $ 8.29 |
Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options |  |  |  |  |  |  |  | 500,000 | 400,000
Common Stock, Dividends, Per Share, Declared (in Dollars per share) |  |  | $ 0.02 |  |  |  |  |  |
Dividends, Common Stock |  |  | 5,600,000 |  |  |  |  |  |
Average Realized Silver Price |  |  | 37.02 |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Ratio |  | 9.3773 |  |  |  |  |  |  |
Stock Issued During Period, Shares, Conversion of Convertible Securities (in Shares) |  | 18,900,000 |  |  |  |  |  |  |
Mandatory Convertible Preferred Stock Dividend |  |  |  |  |  | 3,300,000 |  |  |
Warrants Exercised |  |  | 1,900,000 |  |  |  |  | 1,900,000 |
Proceeds from Warrant Exercises |  |  |  |  | 9,500,000 |  |  | 4,600,000 |
Vesting 2012 [Member] |  |  |  |  |  |  |  |  |
RemainingStockUnitAwardExpense |  |  |  |  |  |  |  | 1,400,000 |
Vesting 2014 [Member] |  |  |  |  |  |  |  |  |
RemainingStockUnitAwardExpense |  |  |  |  |  |  |  | $ 1,100,000 |

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