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Note 8. Shareholders' Equity (Detail) - Potential Per Share Dividend Amounts (USD $) | Mar. 31, 2012
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Thirty Dollars [Member] | Quarterly [Member] |
Dividend payable per share | $ 0.01
Thirty Dollars [Member] | Annual [Member] |
Dividend payable per share | $ 0.04
Thirty Five Dollars [Member] | Quarterly [Member] |
Dividend payable per share | $ 0.02
Thirty Five Dollars [Member] | Annual [Member] |
Dividend payable per share | $ 0.08
Forty Dollars [Member] | Quarterly [Member] |
Dividend payable per share | $ 0.03
Forty Dollars [Member] | Annual [Member] |
Dividend payable per share | $ 0.12
Forty Five Dollars [Member] | Quarterly [Member] |
Dividend payable per share | $ 0.04
Forty Five Dollars [Member] | Annual [Member] |
Dividend payable per share | $ 0.16
Fifty Dollars [Member] | Quarterly [Member] |
Dividend payable per share | $ 0.05
Fifty Dollars [Member] | Annual [Member] |
Dividend payable per share | $ 0.20
Fifty Five Dollars [Member] | Quarterly [Member] |
Dividend payable per share | $ 0.06
Fifty Five Dollars [Member] | Annual [Member] |
Dividend payable per share | $ 0.24
Sixty Dollars [Member] | Quarterly [Member] |
Dividend payable per share | $ 0.07
Sixty Dollars [Member] | Annual [Member] |
Dividend payable per share | $ 0.28

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- Definition No authoritative reference available. + References No definition available. + Details
Name: | hl_DividendPayablePerShare
Namespace Prefix: | hl_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant