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Note 18. Subsequent Events (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011
Planned Capital Expenditures | $ 50.0
Loose Cementitous Material [Member] |
Planned Capital Expenditures | 10.0
Other Capital Projects [Member] |
Planned Capital Expenditures | 20.0
Shaft Improvements [Member] |
Planned Capital Expenditures | 20.0
Non-Capitalized Exenses [Member] |
Planned Capital Expenditures | $ 17.5

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