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Description of Business (Details) (USD $)
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0 Months Ended |
6 Months Ended |
0 Months Ended |
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Mar. 14, 2014
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Dec. 31, 2014
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Mar. 19, 2014
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Mar. 19, 2014
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Jun. 30, 2014
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Mar. 17, 2014
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Feb. 12, 2014
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| Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |
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| Common stock, par value (usd per share) |
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$ 0.01us-gaap_CommonStockParOrStatedValuePerShare
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$ 0.01us-gaap_CommonStockParOrStatedValuePerShare
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$ 0.01us-gaap_CommonStockParOrStatedValuePerShare
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| Common stock, shares outstanding |
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6,962,742us-gaap_CommonStockSharesOutstanding
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6,962,742us-gaap_CommonStockSharesOutstanding
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7,402,664us-gaap_CommonStockSharesOutstanding
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| Cancellation of shares by Former Parent, shares |
71,922amrk_StockCanceledDuringPeriodShares
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71,922amrk_StockCanceledDuringPeriodShares
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| Common stock exchange ratio, numerator |
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1amrk_EquityAwardExchangeRatioNumerator
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| Common stock exchange ratio, denominator |
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4.1717amrk_InverseEquityAwardExchangeRatioDenominator
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| Awards assumed from SGI spin-off |
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| Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |
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| Grants during the period (shares) |
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249,846us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_PlanNameAxis
= amrk_AwardsAssumedfromSGIPlanrelatedtospinoffMember
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| Awards assumed from SGI spin-off | Restricted Stock Units (RSUs) |
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| Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |
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| Grants during the period (shares) |
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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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| Awards assumed from SGI spin-off | Stock Appreciation Rights (SARs) |
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| Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |
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| Grants during the period (shares) |
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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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| Former Parent SGI Plans |
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| Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |
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| Secondment fee payable |
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$ 150,000us-gaap_OtherCommitment
/ amrk_AnnualFeeDueforServiceCommitmentAxis
= amrk_FormerParentSGIPlansMember
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