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Note 6 - Senior Notes, Credit Facilities, and Capital Leases (Details) (USD $) | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Feb. 28, 2014 | Apr. 30, 2013 | Jan. 31, 2014 | Apr. 12, 2013
Note 6 - Senior Notes, Credit Facilities, and Capital Leases (Details) [Line Items] |  |  |  |  |  |
Pension Contributions | $ 6,500,000 us-gaap_PensionContributions |  |  |  |  |
Proceeds from Issuance of Senior Long-term Debt | 490,000,000 us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt |  |  |  |  |
Underwriting Discount on Senior Notes |  |  |  | 2.00%hl_UnderwritingDiscountOnSeniorNotes |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | 100,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity |  |  |
Capital Leases Including Purchase Option | 23,100,000 hl_CapitalLeasesIncludingPurchaseOption |  |  |  |  |
Capital Lease Obligations, Current | 9,491,000 us-gaap_CapitalLeaseObligationsCurrent | 8,471,000 us-gaap_CapitalLeaseObligationsCurrent |  |  |  |
Capital Lease Obligations, Noncurrent | 13,650,000 us-gaap_CapitalLeaseObligationsNoncurrent | 14,332,000 us-gaap_CapitalLeaseObligationsNoncurrent |  |  |  |
Capital Lease Obligations | 22,657,000 us-gaap_CapitalLeaseObligations | 22,800,000 us-gaap_CapitalLeaseObligations |  |  |  |
Capital Leases, Future Minimum Payments Due | 23,785,000 us-gaap_CapitalLeasesFutureMinimumPaymentsDue |  |  |  |  |
Capital Leases, Future Minimum Payments, Interest Included in Payments | 1,128,000 us-gaap_CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments |  |  |  |  |
Senior Notes [Member] |  |  |  |  |  |
Note 6 - Senior Notes, Credit Facilities, and Capital Leases (Details) [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  | 500,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Pension Contributions | 6,500,000 us-gaap_PensionContributions / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |
Percentage Of Notes Tendered For Exchange |  |  |  |  | 99.99%hl_PercentageOfNotesTenderedForExchange / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |
Debt Instrument, Unamortized Discount | 8,000,000 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  | 10,000,000 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 6.875%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Interest Costs Capitalized | 11,800,000 us-gaap_InterestCostsCapitalized / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 6,500,000 us-gaap_InterestCostsCapitalized / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |
Interest Expense, Debt | $ 24,600,000 us-gaap_InterestExpenseDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | $ 19,100,000 us-gaap_InterestExpenseDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed | 100.00%us-gaap_DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |
Percentage of Notes Redeemable | 35.00%hl_PercentageOfNotesRedeemable / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |
Debt Instrument, Redemption Price, Percentage | 101.00%us-gaap_DebtInstrumentRedemptionPricePercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |

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- Definition Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 + Details
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- Definition Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal, through the balance sheet date and due to be paid more than one year (or one operating cycle, if longer) after the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6455314&loc=d3e45023-112735 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
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- Definition Amount of minimum lease payments for capital leases. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 + Details
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