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Note 3. Properties, Plants, Equipment and Mineral Interests, and Lease Commitments (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Total Capital Expenditures Excluding Capital Leases | $ 130.1 |  |
Capital Leased Assets, Gross | 15.8 | 8.9 |
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation | 5.7 | 3.1 |
Operating Leases, Rent Expense | 3.0 | 3.0 | 2.4
San Jan Silver Project [Member] |  |  |
Total Capital Expenditures Excluding Capital Leases | 33.8 |  |
Lucky Friday [Member] |  |  |
Total Capital Expenditures Excluding Capital Leases | 58.1 |  |
Greens Creek [Member] |  |  |
Total Capital Expenditures Excluding Capital Leases | $ 36.8 |  |

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- Definition The total charge for the use of long-lived depreciable assets subject to a lease meeting the criteria for capitalization. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 13 -Paragraph 122 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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FASB -Name Statement of Financial Accounting Standard (FAS) -Number 13 -Paragraph 13 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 2) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6455314&loc=d3e45014-112735 + Details
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