XML 33 R31.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Note 4 - Commitments, Contingencies and Obligations (Detail) | 1 Months Ended | 3 Months Ended |  |  |  | 3 Months Ended |  |  | 1 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 30, 2014 USD ($) | Oct. 31, 2013 USD ($) | Apr. 30, 2013 USD ($) | Mar. 31, 2013 USD ($) | Mar. 31, 2013 CAD | Aug. 31, 2012 USD ($) | Jun. 30, 2011 USD ($) | Mar. 31, 2013 USD ($) | Dec. 31, 2012 USD ($) | Mar. 31, 2012 USD ($) | May 07, 2013 USD ($) | May 07, 2013 CAD | Apr. 12, 2013 | Apr. 30, 2009 USD ($) | Mar. 31, 2013 Greens Creek [Member] USD ($) | Mar. 31, 2013 Lucky Friday [Member] USD ($) | Mar. 31, 2013 Non-Capital Costs [Member] USD ($) | Dec. 31, 2012 Minimum [Member] USD ($) | Dec. 31, 2012 Maximum [Member] USD ($) | Jan. 31, 2010 Costs Incurred By The EPA [Member] USD ($)
Maximum Environmental Remediation Obligation |  |  |  |  |  |  |  | $ 2,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Estimate of Possible Loss |  |  |  |  |  |  |  |  |  |  |  |  |  | 177,500 |  |  |  | 0 | 10,000,000 |
Payment Of Response Costs |  |  |  |  |  | 1,100,000 |  |  | 1,100,000 |  |  |  |  |  |  |  |  |  |  |
Other Accrued Liabilities, Noncurrent |  |  |  |  |  |  |  |  | 300,000 |  |  |  |  |  |  |  |  |  |  |
Estimated Response Costs |  |  |  |  |  |  | 4,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated Future Response Cost |  |  |  |  |  |  | 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Incurred Response Costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200,000,000
Business Acquisition, Share Price (in Dollars per share) |  |  |  |  | 4.75 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition Per Share Issued (in Shares) |  |  |  | 0.9953 | 0.9953 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Cost of Acquired Entity, Purchase Price (in Dollars and Dollars) |  |  |  |  | 513,600,000 |  |  |  |  |  | 695,500,000 | 700,900,000 |  |  |  |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in Shares) |  |  |  | 57,000,000 | 57,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  |  | 500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 6.875% |  |  |  |  |  |  |  |  |  | 6.875% |  |  |  |  |  |  |
Contractual Obligations |  |  |  | 10,300,000 |  |  |  | 10,300,000 |  |  |  |  |  |  |  |  | 1,800,000 |  |  |
Open Purchase Orders |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,400,000 | 300,000 |  |  |  |
Noncapital Costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 300,000 | 300,000 |  |  |  |
Commitments For Capital Lease Payments |  |  |  | 23,600,000 |  |  |  | 23,600,000 |  |  |  |  |  |  |  |  |  |  |  |
Environmental Expense and Liabilities | 55,400,000 | 15,000,000 |  |  |  |  |  | 591,000 |  | 1,427,000 |  |  |  |  |  |  |  |  |  |
Letters of Credit Outstanding, Amount |  |  |  | $ 1,200,000 |  |  |  | $ 1,200,000 |  |  |  |  |  |  |  |  |  |  |  |

X
- Definition Business Acquisition Per Share Issued + References No definition available. + Details
Name: | hl_BusinessAcquisitionPerShareIssued
Namespace Prefix: | hl_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition No authoritative reference available. + References No definition available. + Details
Name: | hl_CommitmentsForCapitalLeasePayments
Namespace Prefix: | hl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition No authoritative reference available. + References No definition available. + Details
Name: | hl_ContractualObligations
Namespace Prefix: | hl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Estimated future response costs to be incurred by EPA. + References No definition available. + Details
Name: | hl_EstimatedFutureResponseCost
Namespace Prefix: | hl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition No authoritative reference available. + References No definition available. + Details
Name: | hl_EstimatedResponseCosts
Namespace Prefix: | hl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition No authoritative reference available. + References No definition available. + Details
Name: | hl_IncurredResponseCosts
Namespace Prefix: | hl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition No authoritative reference available. + References No definition available. + Details
Name: | hl_MaximumEnvironmentalRemediationObligation
Namespace Prefix: | hl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition No authoritative reference available. + References No definition available. + Details
Name: | hl_NoncapitalCosts
Namespace Prefix: | hl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition No authoritative reference available. + References No definition available. + Details
Name: | hl_OpenPurchaseOrders
Namespace Prefix: | hl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition No authoritative reference available. + References No definition available. + Details
Name: | hl_PaymentOfResponseCosts
Namespace Prefix: | hl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph d -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. + Details
Name: | us-gaap_BusinessAcquisitionCostOfAcquiredEntityPurchasePrice
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Number of shares of equity interests issued or issuable to acquire entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph d -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. + Details
Name: | us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition For an acquired entity, price of a single share of a number of saleable stocks of a company. + References No definition available. + Details
Name: | us-gaap_BusinessAcquisitionSharePrice
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Interest rate stated in the contractual debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The adjustment to exclude the noncash portion of, and include cash payments for environmental costs when calculating operating cash flows under the indirect method. The adjustment can include the increase (decrease) during an accounting period in total estimated obligations recorded for probable future loss attributable to environmental contamination issues. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -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 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
Name: | us-gaap_EnvironmentalExpenseAndLiabilities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Reflects the estimated amount of loss from the specified contingency as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 5 -Paragraph 9, 10, 11, 12 -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 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14435-108349 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14557-108349 + Details
Name: | us-gaap_LossContingencyEstimateOfPossibleLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The noncurrent portion (due beyond one year or one operating cycle) of other accrued expenses (expenses incurred at the end of the reporting period but not yet paid) not otherwise defined in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 24 -Article 5 + Details
Name: | us-gaap_OtherAccruedLiabilitiesNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt. + References No definition available. + Details
Name: | us-gaap_ProceedsFromIssuanceOfDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration