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Commitments and Contingencies - Summary of Future Minimum Lease Payments and Rentals under Lease Agreements (Detail) (USD $)
In Thousands, unless otherwise specified |
Mar. 31, 2015
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| Minimum Lease Commitments | |
| Commitments And Contingencies [Line Items] | |
| Remainder of 2015 |
$ 2,757us-gaap_OperatingLeasesFutureMinimumPaymentsRemainderOfFiscalYear / us-gaap_LeaseArrangementTypeAxis = samg_MinimumLeaseCommitmentsMember |
| 2016 |
3,646us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears / us-gaap_LeaseArrangementTypeAxis = samg_MinimumLeaseCommitmentsMember |
| 2017 |
2,838us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears / us-gaap_LeaseArrangementTypeAxis = samg_MinimumLeaseCommitmentsMember |
| 2018 |
60us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears / us-gaap_LeaseArrangementTypeAxis = samg_MinimumLeaseCommitmentsMember |
| 2019 |
36us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears / us-gaap_LeaseArrangementTypeAxis = samg_MinimumLeaseCommitmentsMember |
| Total |
9,337us-gaap_OperatingLeasesFutureMinimumPaymentsDue / us-gaap_LeaseArrangementTypeAxis = samg_MinimumLeaseCommitmentsMember |
| Minimum Net Rentals | |
| Commitments And Contingencies [Line Items] | |
| Remainder of 2015 |
2,424us-gaap_OperatingLeasesFutureMinimumPaymentsRemainderOfFiscalYear / us-gaap_LeaseArrangementTypeAxis = samg_MinimumNetRentalsMember |
| 2016 |
3,202us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears / us-gaap_LeaseArrangementTypeAxis = samg_MinimumNetRentalsMember |
| 2017 |
2,495us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears / us-gaap_LeaseArrangementTypeAxis = samg_MinimumNetRentalsMember |
| 2018 |
60us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears / us-gaap_LeaseArrangementTypeAxis = samg_MinimumNetRentalsMember |
| 2019 |
36us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears / us-gaap_LeaseArrangementTypeAxis = samg_MinimumNetRentalsMember |
| Total |
8,217us-gaap_OperatingLeasesFutureMinimumPaymentsDue / us-gaap_LeaseArrangementTypeAxis = samg_MinimumNetRentalsMember |
| Non-cancellable Subleases | |
| Commitments And Contingencies [Line Items] | |
| Remainder of 2015 |
(333)samg_OperatingLeasesFutureMinimumPaymentsDueFromCurrentSubleaseLeaseRentals / us-gaap_LeaseArrangementTypeAxis = samg_NoncancellableSubleasesMember |
| 2016 |
(444)samg_OperatingLeasesFutureMinimumPaymentsDueFromSubleaseRentalsYearTwo / us-gaap_LeaseArrangementTypeAxis = samg_NoncancellableSubleasesMember |
| 2017 |
(343)samg_OperatingLeasesFutureMinimumPaymentsDueFromSubleaseRentalsYearThree / us-gaap_LeaseArrangementTypeAxis = samg_NoncancellableSubleasesMember |
| Total |
$ (1,120)samg_OperatingLeasesFutureMinimumPaymentsDueFromSubleaseRentals / us-gaap_LeaseArrangementTypeAxis = samg_NoncancellableSubleasesMember |
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- Definition
Operating Leases Future Minimum Payments Due From Current Sublease Rentals No definition available.
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- Definition
Operating leases future minimum payments due from sublease rentals. No definition available.
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Operating leases future minimum payments due from sublease rentals year three. No definition available.
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Operating leases future minimum payments due from sublease rentals year two. No definition available.
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- Definition
Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the remainder of the fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. No definition available.
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