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Note 3 - Properties, Plants, Equipment and Mineral Interests, and Lease Commitments (Details) | 0 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 02, 2013 USD ($) | Jun. 02, 2013 CAD | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2012 USD ($) | Dec. 31, 2014 Lucky Friday [Member] USD ($) | Dec. 31, 2014 Greens Creek [Member] USD ($) | Dec. 31, 2014 Casa Berardi [Member] USD ($) | Dec. 31, 2014 Aurizon Mines Ltd [Member] USD ($) | Dec. 31, 2014 Aurizon Mines Ltd [Member] CAD
Note 3 - Properties, Plants, Equipment and Mineral Interests, and Lease Commitments (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Total Capital Expenditures |  |  | $ 122,500,000 hl_TotalCapitalExpenditures |  |  | $ 49,400,000 hl_TotalCapitalExpenditures / us-gaap_StatementBusinessSegmentsAxis = hl_LuckyFridayMember | $ 26,200,000 hl_TotalCapitalExpenditures / us-gaap_StatementBusinessSegmentsAxis = hl_GreensCreekMember | $ 46,600,000 hl_TotalCapitalExpenditures / us-gaap_StatementBusinessSegmentsAxis = hl_CasaBerardiMember |  |
Business Combination, Consideration Transferred | 714,500,000 us-gaap_BusinessCombinationConsiderationTransferred1 | 740,800,000 us-gaap_BusinessCombinationConsiderationTransferred1 | 714,513,000 us-gaap_BusinessCombinationConsiderationTransferred1 |  |  |  |  |  | 714,500,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = hl_AurizonMinesLtdMember | 740,800,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = hl_AurizonMinesLtdMember
Accumulated Capitalized Interest Costs |  |  | 11,800,000 us-gaap_AccumulatedCapitalizedInterestCosts | 6,500,000 us-gaap_AccumulatedCapitalizedInterestCosts |  |  |  |  |  |
Capital Leased Assets, Gross |  |  | 50,700,000 us-gaap_CapitalLeasedAssetsGross | 41,200,000 us-gaap_CapitalLeasedAssetsGross |  |  |  |  |  |
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation |  |  | 8,600,000 us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation | 10,100,000 us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation |  |  |  |  |  |
Operating Leases, Rent Expense |  |  | $ 3,500,000 us-gaap_LeaseAndRentalExpense | $ 3,100,000 us-gaap_LeaseAndRentalExpense | $ 3,100,000 us-gaap_LeaseAndRentalExpense |  |  |  |  |

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- Definition Total capital expenditures incurred, excluding non-cash items for additions acquired under capital leases and adjustments for asset retirement obligations, capitalized interest, and deferred taxes. + References No definition available. + Details
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- Definition Amount of accumulated interest costs capitalized as part of property, plant and equipment cost basis. + References No definition available. + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition Amount before accumulated depreciation of leased physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: 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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- 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 Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6455314&loc=d3e45014-112735 Reference 2: 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 + Details
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- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
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