A-Mark Precious Metals, Inc. Quarterly report pursuant to Section 13 or 15(d)

Description of Business - Additional Information (Details)

v3.25.0.1

Description of Business - Additional Information (Details) $ in Thousands	1 Months Ended			6 Months Ended
	Sep. 30, 2024 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2022	Dec. 31, 2024 USD ($) Reportable_segments Product Coin	Dec. 31, 2023 USD ($)
Description Of Business [Line Items]
Number of reportable segments \| Reportable_segments				3
Number of coins and bar products \| Coin				2,100
Dividend paid				$ 9,275	$ 32,686
Silver Gold Bull, Inc.
Description Of Business [Line Items]
Cash consideration		$ 9,600
Business acquisition, option to purchase additional percentage of the outstanding equity		8.00%	27.60%
Dividends declared		$ 15,900
Dividend paid				$ 11,900
Ownership interest percentage after transaction		55.40%	47.40%
Silver Gold Bull, Inc. \| SGB Shareholders
Description Of Business [Line Items]
Dividend paid	$ 7,500
JMB
Description Of Business [Line Items]
Number of products \| Product				6,200
Maximum \| Silver Gold Bull, Inc.
Description Of Business [Line Items]
Business acquisition, percentage of interests acquired		70.00%	75.00%
Precious Metals Purchasing Partners, LLC \| Silver Gold Bull, Inc.
Description Of Business [Line Items]
Percentage of ownership percentage				50.00%
Precious Metals Purchasing Partners, LLC \| Goldline, LLC
Description Of Business [Line Items]
Percentage of ownership percentage				50.00%
Collectible Card Partners, LLC
Description Of Business [Line Items]
Percentage of ownership percentage				50.00%

- Definition

Business acquisition percentage of additional voting interests acquired.

+ References

No definition available.

+ Details

Name:	amrk_BusinessAcquisitionPercentageOfAdditionalVotingInterestsAcquired
Namespace Prefix:	amrk_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Description of business.

+ References

No definition available.

+ Details

Name:	amrk_DescriptionOfBusinessLineItems
Namespace Prefix:	amrk_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Dividends declared.

+ References

No definition available.

+ Details

Name:	amrk_DividendsDeclared
Namespace Prefix:	amrk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Number of coins and bar products.

+ References

No definition available.

+ Details

Name:	amrk_NumberOfCoinsAndBarProducts
Namespace Prefix:	amrk_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of products.

+ References

No definition available.

+ Details

Name:	amrk_NumberOfProducts
Namespace Prefix:	amrk_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479328/805-10-50-2

+ Details

Name:	us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 47
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482785/280-10-55-47

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 54
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482785/280-10-55-54

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 18
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-18

+ Details

Name:	us-gaap_NumberOfReportableSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 15
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-15

+ Details

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

- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 805
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479581/805-30-50-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-13

+ Details

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

- Definition

Percentage of subsidiary's or equity investee's stock owned by parent company after stock transaction.

+ References

No definition available.

+ Details

Name:	us-gaap_SaleOfStockPercentageOfOwnershipAfterTransaction
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of units or percentage investment held in the subsidiary by the limited liability company or limited partnership.

+ References

No definition available.

+ Details

Name:	us-gaap_SubsidiaryOfLimitedLiabilityCompanyOrLimitedPartnershipOwnershipInterest
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_BusinessAcquisitionAxis=amrk_SilverGoldBullIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=amrk_SgbShareholdersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=amrk_JMBullionIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_OwnershipAxis=amrk_PreciousMetalsPurchasingPartnersLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=amrk_GoldlineLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_OwnershipAxis=amrk_CollectibleCardPartnersLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: