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Note 11. Business Segments and Significant Customers (Detail) - Information About Reportable Segments (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Net sales from continuing operations to unaffiliated customers: |  |  |
Net Sales From Continuing Operations To Unaffiliated Customers | $ 477,634 | $ 418,813 | $ 312,548
Income (loss) from operations: |  |  |
Income (Loss) From Operations | 197,645 | (51,555) | 75,272
Capital additions (including non-cash additions): |  |  |
Capital Additions (Including Non-Cash Additions) | 137,385 | 74,739 | 33,540
Depreciation, depletion and amortization from continuing operations: |  |  |
Depreciation, Depletion And Amortization From Continuing Operations | 47,066 | 60,011 | 62,837
Other significant non-cash items from continuing operations: |  |  |
Other Significant Non-Cash Items From Continuing Operations | 33,810 | 80,533 | (3,691)
Identifiable assets: |  |  |
Identifiable Assets | 1,396,090 | 1,382,493 | 1,046,784
Greens Creek [Member] |  |  |
Net sales from continuing operations to unaffiliated customers: |  |  |
Net Sales From Continuing Operations To Unaffiliated Customers | 342,906 | 313,318 | 229,318
Income (loss) from operations: |  |  |
Income (Loss) From Operations | 181,116 | 138,973 | 79,329
Capital additions (including non-cash additions): |  |  |
Capital Additions (Including Non-Cash Additions) | 41,657 | 18,280 | 17,520
Depreciation, depletion and amortization from continuing operations: |  |  |
Depreciation, Depletion And Amortization From Continuing Operations | 41,013 | 51,671 | 52,909
Other significant non-cash items from continuing operations: |  |  |
Other Significant Non-Cash Items From Continuing Operations | 2,326 | 17,829 | 2,974
Identifiable assets: |  |  |
Identifiable Assets | 729,289 | 740,573 | 771,433
Lucky Friday [Member] |  |  |
Net sales from continuing operations to unaffiliated customers: |  |  |
Net Sales From Continuing Operations To Unaffiliated Customers | 134,728 | 105,495 | 83,230
Income (loss) from operations: |  |  |
Income (Loss) From Operations | 75,608 | 48,639 | 27,146
Capital additions (including non-cash additions): |  |  |
Capital Additions (Including Non-Cash Additions) | 60,454 | 54,370 | 15,990
Depreciation, depletion and amortization from continuing operations: |  |  |
Depreciation, Depletion And Amortization From Continuing Operations | 6,053 | 8,340 | 9,928
Other significant non-cash items from continuing operations: |  |  |
Other Significant Non-Cash Items From Continuing Operations | 14 | 5,053 | 22
Identifiable assets: |  |  |
Identifiable Assets | 213,285 | 170,928 | 116,797
All Other Segments [Member] |  |  |
Income (loss) from operations: |  |  |
Income (Loss) From Operations | (59,079) | (239,167) | (31,203)
Capital additions (including non-cash additions): |  |  |
Capital Additions (Including Non-Cash Additions) | 35,274 | 2,089 | 30
Other significant non-cash items from continuing operations: |  |  |
Other Significant Non-Cash Items From Continuing Operations | 31,470 | 57,651 | (6,687)
Identifiable assets: |  |  |
Identifiable Assets | $ 453,516 | $ 470,992 | $ 158,554

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