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Receivables (Narrative) (Details) (USD $)
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9 Months Ended |
0 Months Ended |
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Mar. 31, 2015
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loan
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Mar. 31, 2014
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Sep. 27, 2013
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Jan. 23, 2015
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Jul. 02, 2014
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Jun. 30, 2014
loan
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Jun. 18, 2014
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Jun. 05, 2014
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Oct. 09, 2014
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| Accounts, Notes, Loans and Financing Receivable [Line Items] |
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| Loans receivable average effective rate of interest (percentage) |
8.10%amrk_LoansReceivableAverageEffectiveRateOfInterest
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7.90%amrk_LoansReceivableAverageEffectiveRateOfInterest
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| Short term loan receivable |
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$ 3,100,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
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$ 3,700,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
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$ 2,600,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
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$ 3,800,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
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| Option to extend maturity |
180 days
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| Classes of receivables |
3amrk_ClassesOfReceivables
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| Loans receivable payment terms for interest |
30 days
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| Delinquent period |
30 days
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| Loan receivable liquidation period post default |
90 days
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| Number of loans |
1amrk_FinanceReceivableNumberofLoans
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0amrk_FinanceReceivableNumberofLoans
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| Minimum |
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| Accounts, Notes, Loans and Financing Receivable [Line Items] |
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| Credit quality indicator Loan-to-value threshold percentage |
75.00%amrk_CreditQualityIndicatorLoanToValueThresholdPercentage
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
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| Maximum |
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| Accounts, Notes, Loans and Financing Receivable [Line Items] |
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| Secured loans-to-value percentage |
100.00%amrk_SecuredLoansToValuePercentage
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
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| Collateral Finance Corporation |
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| Accounts, Notes, Loans and Financing Receivable [Line Items] |
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| Short term loan receivable |
2,300,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ dei_LegalEntityAxis
= amrk_CollateralFinanceCorporationMember
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12,800,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ dei_LegalEntityAxis
= amrk_CollateralFinanceCorporationMember
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| Payments to acquire loans receivable |
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400,000us-gaap_PaymentsToAcquireLoansReceivable
/ dei_LegalEntityAxis
= amrk_CollateralFinanceCorporationMember
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| Stack Bowers Galleries |
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| Accounts, Notes, Loans and Financing Receivable [Line Items] |
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| Short term loan receivable |
0us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= amrk_StackBowersGalleriesMember
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2,600,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= amrk_StackBowersGalleriesMember
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2,600,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= amrk_StackBowersGalleriesMember
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| Rate of interest (percentage) |
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5.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= amrk_StackBowersGalleriesMember
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| Collateral Finance Corporation |
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| Accounts, Notes, Loans and Financing Receivable [Line Items] |
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| Short term loan receivable |
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5,800,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= amrk_CollateralFinanceCorporationMember
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| Premium on receivable |
100,000us-gaap_ReceivableWithImputedInterestPremium
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= amrk_CollateralFinanceCorporationMember
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300,000us-gaap_ReceivableWithImputedInterestPremium
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= amrk_CollateralFinanceCorporationMember
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| Rights Assumed for Portfolio on January Twenty Third Twenty Fifteen [Member] | Collateral Finance Corporation |
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| Accounts, Notes, Loans and Financing Receivable [Line Items] |
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| Short term loan receivable |
2,900,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ dei_LegalEntityAxis
= amrk_CollateralFinanceCorporationMember
/ us-gaap_RelatedPartyTransactionAxis
= amrk_RightsAssumedforPortfolioonJanuaryTwentyThirdTwentyFifteenMember
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| Rights Assumed for Portfolio on July 1, 2014 | Collateral Finance Corporation |
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| Accounts, Notes, Loans and Financing Receivable [Line Items] |
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| Short term loan receivable |
1,700,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ dei_LegalEntityAxis
= amrk_CollateralFinanceCorporationMember
/ us-gaap_RelatedPartyTransactionAxis
= amrk_RightsAssumedforPortfolioonJulyFirstTwentyFourteenMember
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| Collateral Finance Corporation | Rights Assumed for Portfolio on June 5, 2014 |
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| Accounts, Notes, Loans and Financing Receivable [Line Items] |
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| Short term loan receivable |
1,100,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= amrk_CollateralFinanceCorporationMember
/ us-gaap_RelatedPartyTransactionAxis
= amrk_RightsAssumedforPortfolioonJuneFifthTwentyFourteenMember
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3,800,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= amrk_CollateralFinanceCorporationMember
/ us-gaap_RelatedPartyTransactionAxis
= amrk_RightsAssumedforPortfolioonJuneFifthTwentyFourteenMember
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| Line of Credit [Member] | Stack Bowers Galleries |
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| Accounts, Notes, Loans and Financing Receivable [Line Items] |
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| Short term loan receivable |
2,000,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= amrk_StackBowersGalleriesMember
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| Line of credit, maximum borrowing capacity |
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$ 16,000,000.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= amrk_StackBowersGalleriesMember
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