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Note 4. Commitments and Contingencies (Detail) (USD $) | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  | 6 Months Ended |  | 6 Months Ended | 4 Months Ended | 16 Months Ended | 28 Months Ended | 4 Months Ended | 43 Months Ended | 1 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 31, 2010 | Dec. 31, 2009 | Apr. 30, 2009 | Jun. 30, 2011 | Jun. 30, 2010 | Nov. 30, 2008 | Jun. 13, 2011 | Jun. 30, 2011 | Jun. 30, 2010 | Jun. 30, 2011 | Dec. 31, 2007 | Feb. 01, 2010 | Sep. 30, 2002 | Jun. 30, 2011 Greens Creek [Member] | Jun. 30, 2011 Greens Creek [Member] | Jun. 30, 2011 Lucky Friday [Member] | Jun. 30, 2011 Lucky Friday [Member] | May 12, 2011 Accrual For Basin Claims Cash [Member] | May 12, 2012 Accrual For Basin Claims Cash [Member] | May 12, 2013 Accrual For Basin Claims Cash [Member] | May 12, 2011 Accrua For Basin Claims Cash OrCommon Stock [Member] | May 12, 2011 Accrual For Basin Claims Proceeds From Warrants [Member] | Aug. 01, 2014 Accrual For Basin Claims Proceeds From Warrants [Member] | Aug. 01, 2014 Warrants Minimum Exercise Price [Member] | Aug. 01, 2014 Warrants Maximum Exercise Price [Member] | Jun. 13, 2011 Foregone Payments [Member] | Jun. 30, 2011 Accrualfor Basin Claims [Member]
Payments for Legal Settlements |  |  |  |  |  |  | $ 263,400,000 |  |  |  |  |  |  |  |  |  |  | $ 102,000,000 | $ 25,000,000 | $ 15,000,000 | $ 55,500,000 | $ 9,500,000 | $ 56,400,000 |  |  | $ 197.5 |
Future Clean Up Costs |  |  |  |  |  |  |  |  |  |  |  | 1,300,000,000 | 359,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Claims For Natural Resource Damages, Lower Range |  |  |  |  |  |  |  |  |  |  |  | 2,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Claims For Natural Resource Damages, Upper Range |  |  |  |  |  |  |  |  |  |  |  | 3,400,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from (Repayments of) Other Debt |  | 482,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Warrants, Exercise Price (in Dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2.45 | $ 2.50 |  |
Legal Settlement Interest Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.25% |
Legal Settlement Accrued Interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,069,792 |
Superfund Rate |  |  |  | 0.69% |  |  |  | 0.69% |  | 0.69% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental Expense and Liabilities |  |  |  |  |  |  |  | 556,000 | 2,502,000 | 193,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 262,200,000
Proceeds from Insurance Settlement, Operating Activities |  |  |  |  |  |  |  |  |  |  | 7,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Past Environmental Remediation Costs |  |  |  |  |  | 52,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
EstimatedFutureCleanUpCost |  |  |  |  |  | 291,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
PercentOtherCost |  |  |  |  |  | 12.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Environmental Remediation Obligation |  |  |  |  |  |  |  | 2,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
AdministrativePenalty |  |  | 177,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
IncurredResponseCosts | 91,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
EstimatedFutureResponseCost | 72,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase Commitment, Remaining Minimum Amount Committed |  |  |  | 5,500,000 |  |  |  | 5,500,000 |  | 5,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
NonCapitalCostPurchaseOrders |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,300,000 |  |  |  |  |  |  |  |  |  |  |  |
Accounts Payable, Other |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,300,000 |  | 2,200,000 |  |  |  |  |  |  |  |  |  |  |
Other Cost and Expense, Operating |  |  |  | 2,270,000 | 1,601,000 |  |  | 4,087,000 | 2,565,000 |  |  |  |  |  | 900,000 |  | 100,000 |  |  |  |  |  |  |  |  |  |
ApproximateCapitalLeaseObligationIncludingInterest |  |  |  | 8,100,000 |  |  |  | 8,100,000 |  | 8,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of Credit Outstanding, Amount |  |  |  | $ 600,000 |  |  |  | $ 600,000 |  | $ 600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

X
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- Definition The cash inflow from the amounts received by the insured under the terms of an insurance contract settlement. This element pertains only to insurance proceeds related to operating activities. It excludes insurance settlements classified as investing cash flows, for example, insurance settlements related to fixed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 22 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 16 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3337-108585 + Details
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