Quarterly report pursuant to Section 13 or 15(d)

Organization and Business - Additional Information (Detail)

v2.4.1.9
Organization and Business - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 0 Months Ended
Mar. 31, 2015
Jun. 26, 2013
Mar. 11, 2004
Dec. 31, 2004
Oct. 03, 2008
Apr. 01, 2012
Business And Organization [Line Items]            
Tax receivable agreement with limited partner, percentage of cash savings to be paid 85.00%samg_TaxReceivableAgreementWithLimitedPartnersTaxBenefitPercentageOfCashSavingsToBePaid          
Recognition of tax receivable agreement liability $ 15,785samg_RecognitionOfTaxReceivableAgreementLiability          
Percentage of cash savings expected to be realized 15.00%samg_TaxReceivableAgreementWithLimitedPartnersTaxBenefitPercentageOfCashSavingsExpectedToBeRealized          
Silvercrest Financial Services Inc            
Business And Organization [Line Items]            
Percentage of outstanding shares acquired     100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= samg_SilvercrestFinancialServicesIncMember 		     
Sam Alternative Solutions Inc            
Business And Organization [Line Items]            
Percentage of outstanding shares acquired       100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= samg_SamAlternativeSolutionsIncMember 		   
Marathon Capital Group, LLC            
Business And Organization [Line Items]            
Percentage of outstanding shares acquired         100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= samg_MarathonCapitalGroupLlcMember 		 
Mw Commodity Advisors Llc            
Business And Organization [Line Items]            
Percentage of outstanding shares acquired           100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= samg_MwCommodityAdvisorsLlcMember
Class A Common Stock            
Business And Organization [Line Items]            
Percentage ownership in a consolidated subsidiary 63.00%us-gaap_MinorityInterestOwnershipPercentageByParent
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember 		62.00%us-gaap_MinorityInterestOwnershipPercentageByParent
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember 		       
Number of shares held by parent   7,524,271samg_NumberOfCommonSharesHeldByParent
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember