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Equity-Based Compensation - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified |
12 Months Ended | |||
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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Nov. 02, 2012
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | ||||
| Equity program, description | The Deferred Equity Unit represents the unsecured right to receive one unit of SLP or the equivalent cash value of up to 50% (or such other percentage as may be determined by the Company’s Executive Committee) of SLP’s units issuable upon the vesting of any such Deferred Equity Units and the remaining 50% in units upon the vesting of any such Deferred Equity Units. | |||
| Performance Unit, description | The Performance Unit represents the unsecured right to receive one unit of SLP for every two units of SLP issuable upon the vesting of any such Deferred Equity Units. | |||
| Compensation expense | $ 1,043us-gaap_AllocatedShareBasedCompensationExpense | $ 2,222us-gaap_AllocatedShareBasedCompensationExpense | $ 1,388us-gaap_AllocatedShareBasedCompensationExpense | |
| Cash distributions on awards | 1samg_CashDistributionPaidOnAwards | 13samg_CashDistributionPaidOnAwards | 17samg_CashDistributionPaidOnAwards | |
| Unrecognized compensation expense related to unvested awards | 168us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions | 906us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions | ||
| Recognition period of unrecognized compensation expense related to unvested awards | 7 months 24 days | 1 year 1 month 28 days | ||
| Distribution of partnership units for each limited partnership unit prior to the consummation of the IPO | 19.64samg_DistributionOfPartnershipUnitsForEachLimitedPartnershipUnitPriorToConsummationOfInitialPublicOffering | |||
| Estimated percentage of awards to be forfeited | 10.00%samg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeiturePercentage | |||
| Estimated service period | 4 years | |||
| 2012 Equity Incentive Plan | ||||
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | ||||
| Shares reserved for issuance |
1,670,960us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = samg_TwoThousandTwelveEquityIncentivePlanMember |
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| Shares reserved for issuance, authorized |
1,687,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = samg_TwoThousandTwelveEquityIncentivePlanMember |
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| Performance Units | ||||
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | ||||
| Compensation expense |
109us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember |
245us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember |
147us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember |
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| Deferred Equity Units | ||||
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | ||||
| Vested awards settled in cash |
$ 30us-gaap_EmployeeServiceShareBasedCompensationCashFlowEffectCashUsedToSettleAwards / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = us-gaap_DeferredCompensationShareBasedPaymentsMember |
$ 260us-gaap_EmployeeServiceShareBasedCompensationCashFlowEffectCashUsedToSettleAwards / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = us-gaap_DeferredCompensationShareBasedPaymentsMember |
$ 63us-gaap_EmployeeServiceShareBasedCompensationCashFlowEffectCashUsedToSettleAwards / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = us-gaap_DeferredCompensationShareBasedPaymentsMember |
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- Definition
Cash distribution paid on awards. No definition available.
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- Definition
Distribution of partnership units for each limited partnership unit prior to consummation of initial public offering. No definition available.
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- Definition
Share based compensation arrangement by share based payment award equity instruments other than options forfeiture percentage. No definition available.
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- Definition
Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Aggregate cash paid by the entity during the period to settle equity instruments granted under equity-based payment arrangements. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. No definition available.
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- Definition
Description of the various rights, preferences, and privileges of the limited partners' ownership units including: redemption, conversion, liquidation, tax status of distribution per unit and the sharing in distributions. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
General descriptive information regarding an arrangement under which employees and directors receive: (a) awards of equity shares, equity share options, or other equity instruments; or (b) the entity incurs liabilities to them: (1) in amounts based, at least in part, on the price of the entity's shares or other equity instruments; or (2) that require or may require settlement by issuance of the entity's shares. Such an arrangement is usually provided to employees and directors to compensate them, provide performance incentives to them, and to attract or retain their services. May also include pertinent information particular to a plan that is not elsewhere specified in the taxonomy. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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