Represents the estimated future response cost that the EPA may ultimately incur related to a site.

No definition available.

Name:	hl_EstimatedFutureResponseCost
Namespace Prefix:	hl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Represents the estimated amount of response costs that have been incurred by the EPA in cleaning up a site.

+ References

No definition available.

+ Details

Name:	hl_EstimatedResponseCosts
Namespace Prefix:	hl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Represents the amount of surety bonds in place as of a specified date. Such surety bonds may be for the purpose of, but not limited to, financial support for future reclamation and closure costs, self-insurance, and employee benefit plans.

+ References

No definition available.

+ Details

Name:	hl_SuretyBonds
Namespace Prefix:	hl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of contractual obligation, including, but not limited to, long-term debt, lease obligation, purchase obligation, and other commitments.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-3

+ Details

Name:	us-gaap_ContractualObligation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of lessee's undiscounted obligation for lease payment for operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-6

+ Details

Name:	us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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

- Definition

The amount of cash paid for the settlement of litigation or for other legal issues during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 25
-Subparagraph (g)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-25

+ Details

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

- Details

Name:	us-gaap_OtherCommitmentsAxis=hl_LeaseCommitmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_OtherCommitmentsAxis=hl_PerformanceObligationCommitmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=hl_GreensCreekMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis=hl_PurchaseOrdersAndCommitmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=hl_LuckyFridayMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=hl_KenoHillMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=hl_CasaBerardiMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_EnvironmentalRemediationSiteAxis=hl_JohnnyMMineAreaNearSanMateoNewMexicoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_EnvironmentalRemediationSiteAxis=hl_CarpenterSnowCreekSuperfundSiteCascadeCountyMontanaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Note 16: Commitments, Contingencies, and Obligations (Details Textual) - USD ($) $ in Thousands		1 Months Ended
	Oct. 16, 2024	Jul. 31, 2018	Jun. 30, 2011	Dec. 31, 2024
Lessee, operating lease, liability, to be paid				$ 10,750
Lease Commitments [Member]
Lessee, operating lease, liability, to be paid				10,800
Performance Obligation Commitments [Member]
Surety bonds				213,600
Letters of credit outstanding, amount				6,200
Greens Creek [Member]
Contractual obligation				24,100
Greens Creek [Member] \| Purchase Orders and Commitment [Member]
Contractual obligation				5,800
Lucky Friday [Member]
Estimated response costs	$ 299,000
Payments for legal settlements	$ 174,300
Lucky Friday [Member] \| Purchase Orders and Commitment [Member]
Contractual obligation				9,700
Keno Hill [Member] \| Purchase Orders and Commitment [Member]
Contractual obligation				11,200
Casa Berardi [Member] \| Purchase Orders and Commitment [Member]
Contractual obligation				$ 9,100
Johnny M Mine Area near San Mateo, New Mexico [Member]
Estimated response costs		$ 9,600
Carpenter Snow Creek Superfund Site, Cascade County, Montana [Member]
Estimated response costs			$ 4,500
Estimated future response cost			$ 100,000