Acquisitions - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified
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3 Months Ended |
0 Months Ended |
3 Months Ended |
0 Months Ended |
1 Months Ended |
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Mar. 31, 2014
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Nov. 01, 2014
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Mar. 31, 2015
Installment
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Mar. 30, 2015
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Mar. 28, 2013
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Dec. 31, 2013
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Apr. 30, 2013
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Dec. 31, 2014
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Business Acquisition [Line Items] |
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Cash consideration under Asset Purchase Agreement |
$ 1,679us-gaap_PaymentsToAcquireBusinessesGross
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Promissory Note |
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Business Acquisition [Line Items] |
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Number of installments |
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4samg_DebtInstrumentNumberOfInstallment / us-gaap_LongtermDebtTypeAxis = samg_PromissoryNotesPayableMember
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Installment amount payable |
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900us-gaap_DebtInstrumentPeriodicPaymentPrincipal / us-gaap_LongtermDebtTypeAxis = samg_PromissoryNotesPayableMember
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Jamison |
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Business Acquisition [Line Items] |
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Cash consideration under Asset Purchase Agreement |
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3,550us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = samg_JamisonMember
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Equity consideration for SLP acquired |
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3,967us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = samg_JamisonMember
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Earn out payments percentage on EBITDA remainder of fiscal year |
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20.00%samg_EarnOutPaymentsPercentageOnEBITDARemainderOfFiscalYear / us-gaap_BusinessAcquisitionAxis = samg_JamisonMember
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Earn out payments percentage on EBITDA due in two years |
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20.00%samg_EarnOutPaymentsPercentageOnEBITDADueInTwoYears / us-gaap_BusinessAcquisitionAxis = samg_JamisonMember
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Earn out payments percentage on EBITDA due in three years |
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20.00%samg_EarnOutPaymentsPercentageOnEBITDADueInThreeYears / us-gaap_BusinessAcquisitionAxis = samg_JamisonMember
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Earn out payments percentage on EBITDA due in four years |
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20.00%samg_EarnOutPaymentsPercentageOnEBITDADueInFourYears / us-gaap_BusinessAcquisitionAxis = samg_JamisonMember
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Earn out payments percentage on EBITDA due in five years |
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20.00%samg_EarnOutPaymentsPercentageOnEBITDADueInFiveYears / us-gaap_BusinessAcquisitionAxis = samg_JamisonMember
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Earn Out Payments Percentage On EBITDA Due thereafter |
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20.00%samg_EarnOutPaymentsPercentageOnEBITDADueThereafter / us-gaap_BusinessAcquisitionAxis = samg_JamisonMember
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Jamison | Seller Note |
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Business Acquisition [Line Items] |
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Promissory note issued |
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612samg_BusinessAcquisitionCostOfAcquiredEntityPromissoryNotesIssued / us-gaap_BusinessAcquisitionAxis = samg_JamisonMember / us-gaap_DebtInstrumentAxis = samg_SellerNoteMember
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Interest on principal amount |
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5.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_BusinessAcquisitionAxis = samg_JamisonMember / us-gaap_DebtInstrumentAxis = samg_SellerNoteMember
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Jamison | Principals Notes |
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Business Acquisition [Line Items] |
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Promissory note issued |
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1,771samg_BusinessAcquisitionCostOfAcquiredEntityPromissoryNotesIssued / us-gaap_BusinessAcquisitionAxis = samg_JamisonMember / us-gaap_DebtInstrumentAxis = samg_PrincipalsNotesMember
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Interest on principal amount |
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5.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_BusinessAcquisitionAxis = samg_JamisonMember / us-gaap_DebtInstrumentAxis = samg_PrincipalsNotesMember
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Milbank |
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Business Acquisition [Line Items] |
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Equity consideration for SLP acquired |
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1,325us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = samg_MilbankMember
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1,325us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = samg_MilbankMember
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Outstanding note payable |
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564us-gaap_NotesPayableCurrent / us-gaap_BusinessAcquisitionAxis = samg_MilbankMember
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Ten-Sixty |
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Business Acquisition [Line Items] |
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Cash consideration under Asset Purchase Agreement |
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2,500us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = samg_TenSixtyAssetManagementLlcMember
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Promissory note issued |
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1,479samg_BusinessAcquisitionCostOfAcquiredEntityPromissoryNotesIssued / us-gaap_BusinessAcquisitionAxis = samg_TenSixtyAssetManagementLlcMember
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Acquisition of assets |
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1,900,000us-gaap_AssetsUnderManagementCarryingAmount / us-gaap_BusinessAcquisitionAxis = samg_TenSixtyAssetManagementLlcMember
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Ten-Sixty | Promissory Note |
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Business Acquisition [Line Items] |
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Number of installments |
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2samg_DebtInstrumentNumberOfInstallment / us-gaap_BusinessAcquisitionAxis = samg_TenSixtyAssetManagementLlcMember / us-gaap_LongtermDebtTypeAxis = samg_PromissoryNotesPayableMember
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Installment amount payable |
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218us-gaap_DebtInstrumentPeriodicPaymentPrincipal / us-gaap_BusinessAcquisitionAxis = samg_TenSixtyAssetManagementLlcMember / us-gaap_LongtermDebtTypeAxis = samg_PromissoryNotesPayableMember
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218us-gaap_DebtInstrumentPeriodicPaymentPrincipal / us-gaap_BusinessAcquisitionAxis = samg_TenSixtyAssetManagementLlcMember / us-gaap_LongtermDebtTypeAxis = samg_PromissoryNotesPayableMember
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Quarterly installments from June 30, 2014 through March 31, 2017 |
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87samg_DebtInstrumentQuarterlyPaymentPrincipal / us-gaap_BusinessAcquisitionAxis = samg_TenSixtyAssetManagementLlcMember / us-gaap_LongtermDebtTypeAxis = samg_PromissoryNotesPayableMember
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Principal on fixed rate notes, interest rate |
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5.00%us-gaap_LongTermDebtPercentageBearingFixedInterestRate / us-gaap_BusinessAcquisitionAxis = samg_TenSixtyAssetManagementLlcMember / us-gaap_LongtermDebtTypeAxis = samg_PromissoryNotesPayableMember
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