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Stockholders' Equity (Narrative) (Details) (USD $)
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0 Months Ended |
3 Months Ended |
6 Months Ended |
0 Months Ended |
6 Months Ended |
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Jun. 04, 2014
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Mar. 14, 2014
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Jun. 04, 2014
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Dec. 31, 2014
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Jul. 02, 2013
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Dec. 31, 2013
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Jun. 30, 2014
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Mar. 17, 2014
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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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 |
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(71,922)amrk_StockCanceledDuringPeriodShares
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(71,922)amrk_StockCanceledDuringPeriodShares
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| Repurchase common stock |
$ 2,200,000us-gaap_StockRepurchasedDuringPeriodValue
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| Stock repurchase related interest expense |
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20,000amrk_StockRepurchasedDuringPeriodInterestExpense
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| Interest rate at second closing, percentage |
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4.00%amrk_PurchaseAgreementSharePurchaseInterestRate
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| Intrinsic value, balance |
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213,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
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407,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
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| Stock Appreciation Rights (SARs) |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Award vesting period |
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3 years
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| Shares outstanding |
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8,990us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
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| Fair value assumptions, exercise price |
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$ 50.31us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
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| Intrinsic value, balance |
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0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
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| 2014 Stock Award and Incentive Plan |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Maximum amount of shares per employee |
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250,000amrk_StockAwardProgramMaximumAmountofSharesAuthorizedPerEmployeePerYear
/ us-gaap_PlanNameAxis
= amrk_A2014StockAwardandIncentivePlanMember
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| Shares granted under the plan, shares |
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625,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= amrk_A2014StockAwardandIncentivePlanMember
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| Awards assumed from SGI spin-off | Stock Appreciation Rights (SARs) |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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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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| Former Parent (SGI) |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Dividends paid to SGI |
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0us-gaap_DividendsCommonStockCash
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= amrk_FormerParentSGIMember
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5,000,000us-gaap_DividendsCommonStockCash
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= amrk_FormerParentSGIMember
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5,000,000us-gaap_DividendsCommonStockCash
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= amrk_FormerParentSGIMember
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| Non Employee Director Except Chairman of the Board | 2014 Stock Award and Incentive Plan |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Maximum grant date fair value |
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300,000amrk_StockAwardProgramMaximumAmountofGrantFairValuePerGranteePerYear
/ amrk_EmploymentClassificationsAxis
= amrk_NonEmployeeDirectorExceptChairmanoftheBoardMember
/ us-gaap_PlanNameAxis
= amrk_A2014StockAwardandIncentivePlanMember
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| Chairman of the Board | 2014 Stock Award and Incentive Plan |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Maximum grant date fair value |
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$ 600,000amrk_StockAwardProgramMaximumAmountofGrantFairValuePerGranteePerYear
/ amrk_EmploymentClassificationsAxis
= us-gaap_BoardOfDirectorsChairmanMember
/ us-gaap_PlanNameAxis
= amrk_A2014StockAwardandIncentivePlanMember
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| Auctentia SL |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Repurchase common stock, shares |
373,513us-gaap_StockRepurchasedDuringPeriodShares
/ us-gaap_CounterpartyNameAxis
= amrk_AuctentiaSlMember
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| Afinsa |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Repurchase common stock, shares |
5,520us-gaap_StockRepurchasedDuringPeriodShares
/ us-gaap_CounterpartyNameAxis
= amrk_AfinsaMember
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