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Note 4. Commitments, Contingencies and Obligations (Detail) (USD $) | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | ---
Feb. 29, 2012 | Jun. 30, 2011 | Apr. 30, 2011 | Jan. 31, 2010 | Apr. 30, 2009 | Mar. 31, 2012 | Mar. 31, 2011 | Oct. 31, 2011 | Sep. 08, 2011
Maximum Environmental Remediation Obligation |  |  |  |  |  | $ 2,500,000 |  |  |
AdministrativePenalty |  |  |  |  | 177,500 |  |  |  |
IncurredResponseCosts |  |  |  | 91,000,000 |  |  |  |  |
EstimatedFutureResponseCost |  | 100,000,000 |  | 72,000,000 |  |  |  |  |
ContributionAndCostRecovery |  |  | 9,000,000 |  |  |  |  |  |
Payments to Acquire Land | 1,875,000 |  |  |  |  |  |  |  |
Other Accrued Liabilities, Noncurrent |  |  |  |  |  | 900,000 |  |  |
Increase (Decrease) in Other Accrued Liabilities |  |  |  |  |  | (3,659,000) | (1,378,000) |  |
EstimatedResponseCosts |  | 4,500,000 |  |  |  |  |  |  |
Contractual Obligations |  |  |  |  |  | 6,200,000 |  |  |
Noncapital Costs |  |  |  |  |  | 17,500,000 |  |  |
Commitments for Capital Lease Payments |  |  |  |  |  | 14,400,000 |  |  |
Environmental Litigation and Related Claims |  |  |  |  |  |  |  |  | 95,400,000
Letters of Credit Outstanding, Amount |  |  |  |  |  | 600,000 |  |  |
Annual Maintenance Fee |  |  |  |  |  |  |  | 600,000 |
United Steel Workers Claims Lower Range |  |  |  |  |  | 0 |  |  |
UnitedSteelWorkersClaimsUpperRange |  |  |  |  |  | 10,000,000 |  |  |
Johnny M Mine [Member] |  |  |  |  |  |  |  |  |
Increase (Decrease) in Other Accrued Liabilities |  |  |  |  |  | 700,000 |  |  |
Greens Creek [Member] |  |  |  |  |  |  |  |  |
Open Purchase Orders |  |  |  |  |  | 10,000,000 |  |  |
Lucky Friday [Member] |  |  |  |  |  |  |  |  |
Open Purchase Orders |  |  |  |  |  | 900,000 |  |  |
Greens Creek [Member] |  |  |  |  |  |  |  |  |
Noncapital Costs |  |  |  |  |  | 2,700,000 |  |  |
Lucky Friday [Member] |  |  |  |  |  |  |  |  |
Noncapital Costs |  |  |  |  |  | $ 200,000 |  |  |

X
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