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Stockholders' Equity (Spin-off) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
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0 Months Ended |
6 Months Ended |
0 Months Ended |
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Mar. 19, 2014
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Dec. 31, 2014
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Mar. 14, 2014
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Mar. 19, 2014
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Mar. 17, 2014
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| Class of Stock [Line Items] |
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| Exchange ratio based on average closing price for SGI shares |
0.2397amrk_EquityAwardExchangeRatioofFormerParentsAwardstoReplacementAwardsofParent
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| Common stock exchange ratio |
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4.1717amrk_InverseEquityAwardExchangeRatioDenominator
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| SGI (Former Parent) |
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| Class of Stock [Line Items] |
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| Three day weighted average share price before spin-off ( per share) |
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$ 3.32amrk_FormerParentThreeDayAverageSharePricesBeforeSpinoff
/ dei_LegalEntityAxis
= amrk_FormerParentSGIMember
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| Share price |
14.00us-gaap_SharePrice
/ dei_LegalEntityAxis
= amrk_FormerParentSGIMember
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$ 3.37us-gaap_SharePrice
/ dei_LegalEntityAxis
= amrk_FormerParentSGIMember
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14.00us-gaap_SharePrice
/ dei_LegalEntityAxis
= amrk_FormerParentSGIMember
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$ 13.30us-gaap_SharePrice
/ dei_LegalEntityAxis
= amrk_FormerParentSGIMember
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| SGI |
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| Class of Stock [Line Items] |
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| Three day weighted average share price after spin-off ( per share) |
13.85amrk_ParentThreeDayAverageSharePriceAfterSpinoff
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
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| Awards assumed from SGI spin-off |
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| Class of Stock [Line Items] |
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| Grants during the period (shares) |
249,846us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_PlanNameAxis
= amrk_AwardsAssumedfromSGIPlanrelatedtospinoffMember
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| Total compensation cost not yet recognized |
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0.4us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
/ us-gaap_PlanNameAxis
= amrk_AwardsAssumedfromSGIPlanrelatedtospinoffMember
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| Restricted Stock Units (RSUs) |
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| Class of Stock [Line Items] |
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| Period for recognition of nonvested awards |
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1 year 2 months 8 days
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| Restricted Stock Units (RSUs) | Awards assumed from SGI spin-off |
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| Class of Stock [Line Items] |
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| Grants during the period (shares) |
130,646us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= amrk_AwardsAssumedfromSGIPlanrelatedtospinoffMember
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130,646us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= amrk_AwardsAssumedfromSGIPlanrelatedtospinoffMember
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| Total compensation cost not yet recognized, other than options |
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0.1us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= amrk_AwardsAssumedfromSGIPlanrelatedtospinoffMember
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| Restricted Stock Units (RSUs) | Awards assumed from SGI spin-off | Issued to A-Mark Employees |
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| Class of Stock [Line Items] |
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| Grants during the period (shares) |
50,340us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ dei_LegalEntityAxis
= amrk_IssuedtoAMarkEmployeesMember
/ us-gaap_PlanNameAxis
= amrk_AwardsAssumedfromSGIPlanrelatedtospinoffMember
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| Stock Appreciation Rights (SARs) | Awards assumed from SGI spin-off |
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| Class of Stock [Line Items] |
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| Grants during the period (shares) |
8,990us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
/ us-gaap_PlanNameAxis
= amrk_AwardsAssumedfromSGIPlanrelatedtospinoffMember
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8,990us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
/ us-gaap_PlanNameAxis
= amrk_AwardsAssumedfromSGIPlanrelatedtospinoffMember
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| Total compensation cost not yet recognized, other than options |
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0us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
/ us-gaap_PlanNameAxis
= amrk_AwardsAssumedfromSGIPlanrelatedtospinoffMember
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| Period for recognition of nonvested awards |
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0 days
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| Stock Appreciation Rights (SARs) | Awards assumed from SGI spin-off | Issued to A-Mark Employees |
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| Class of Stock [Line Items] |
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| Grants during the period (shares) |
8,990us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
/ dei_LegalEntityAxis
= amrk_IssuedtoAMarkEmployeesMember
/ us-gaap_PlanNameAxis
= amrk_AwardsAssumedfromSGIPlanrelatedtospinoffMember
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| Stock Options |
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| Class of Stock [Line Items] |
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| Period for recognition of nonvested awards |
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2 years 9 months 25 days
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| Stock Options | Awards assumed from SGI spin-off | Issued to A-Mark Employees |
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| Class of Stock [Line Items] |
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| Grants during the period (shares) |
216,943us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ dei_LegalEntityAxis
= amrk_IssuedtoAMarkEmployeesMember
/ us-gaap_PlanNameAxis
= amrk_AwardsAssumedfromSGIPlanrelatedtospinoffMember
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