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Assets and Liabilities, at Fair Value - Additional Information (Details)	Jun. 30, 2020
Fair Value Disclosures [Abstract]
Redemption rate, percentage	100.00%

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- Definition

Fair Value Disclosure, Redemption Rate

+ References

No definition available.

+ Details

Name:	amrk_FairValueDisclosureRedemptionRate
Namespace Prefix:	amrk_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

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- References

No definition available.

+ Details

Name:	us-gaap_FairValueDisclosuresAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration