The number of common shares outstanding of the acquiree used to estimate consideration in a business acquisition.

No definition available.

Name:	hl_BusinessAcquisitionCommonSharesOutstandingOfAcquiree
Namespace Prefix:	hl_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

In a business acquisition, the estimated value of the acquiree's common stock per share.

+ References

No definition available.

+ Details

Name:	hl_BusinessAcquisitionEstimatedValueOfCommonStockPerShareOfAcquireeCommonStock
Namespace Prefix:	hl_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

The percent of change in the company's share price that will result in a change in the amount of consideration transferred in a business acquisition.

+ References

No definition available.

+ Details

Name:	hl_BusinessAcquisitionPercentOfChangeInSharePriceResultingInChangeInAmountOfConsiderationTransferred
Namespace Prefix:	hl_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

In a business acquisition, the number of shares owned by a subsidiary of the company that are cancelled as a result of the acquisition.

+ References

No definition available.

+ Details

Name:	hl_BusinessAcquisitionSharesOwnedBySubsidaryNumberOfSharesCancelled
Namespace Prefix:	hl_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

In a business acquisition, the number of the company's shares of common stock exchanged for each share of the acquiree's common stock.

+ References

No definition available.

+ Details

Name:	hl_BusinessAcquistionNumberOfCommonStockSharesExchangedForEachShareOfAcquireeCommonStock
Namespace Prefix:	hl_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

The maximum amount of loans authorized to be provided per the term loan and security agreement.

+ References

No definition available.

+ Details

Name:	hl_LoansReceivableMaximumAmount
Namespace Prefix:	hl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	hl_Note13ProposedMergerwithRevettDetailsLineItems
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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- 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 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

Reference 3: 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

+ Details

Name:	us-gaap_BusinessCombinationConsiderationTransferred1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The percentage points (also referred to as 'margin') added to the reference rate as stated in the loan agreement and used to compute the variable rate on the loans receivable. For instance, the loan agreement might state that the interest rate the borrower is obligated to pay is the London Interbank Offered Rate (LIBOR) plus three quarters (3/4) of a percentage point adjusted quarterly (each three months). LIBOR in this example is the index or reference rate, 3/4 percentage point is the margin, the reference rate plus the margin is the fully indexed rate. This element would be used to report separately the margin.

+ References

No definition available.

+ Details

Name:	us-gaap_LoansReceivableBasisSpreadOnVariableRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Price of a single share of a number of saleable stocks of a company.

+ References

No definition available.

+ Details

Name:	us-gaap_SharePrice
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
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Note 13 - Proposed Merger with Revett (Details) (Revett Mining Company, Inc. [Member], USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended
	May 05, 2015	Apr. 30, 2015	Mar. 26, 2015	Mar. 25, 2015
Note 13 - Proposed Merger with Revett (Details) [Line Items]
Business Acquistion, Number of Common Stock Shares Exchanged for Each Share of Acquiree Common Stock			0.1622
Business Acquisition, Estimated Value of Common Stock per Share of Acquiree Common Stock			$ 0.52
Share Price				$ 3.23us-gaap_SharePrice
Business Acquisition, Percent of Change in Share Price Resulting in Change in Amount of Consideration Transferred			1.90%
Business Acquisition, Common Shares Outstanding of Acquiree			38,548,989
Business Acquisition, Shares Owned by Subsidary, Number of Shares Cancelled			725,000
Subsequent Event [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Note 13 - Proposed Merger with Revett (Details) [Line Items]
Loans Receivable, Basis Spread on Variable Rate		5.00%
Subsequent Event [Member]
Note 13 - Proposed Merger with Revett (Details) [Line Items]
Share Price	$ 3.01
Business Combination, Consideration Transferred	$ 18.8
Loans Receivable Maximum Amount		1.5