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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 |
Dec. 31, 2014
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| Minimum Lease Commitments | |
| Commitments And Contingencies [Line Items] | |
| 2015 |
$ 3,693us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears / us-gaap_LeaseArrangementTypeAxis = samg_MinimumLeaseCommitmentsMember |
| 2016 |
3,646us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears / us-gaap_LeaseArrangementTypeAxis = samg_MinimumLeaseCommitmentsMember |
| 2017 |
2,838us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears / us-gaap_LeaseArrangementTypeAxis = samg_MinimumLeaseCommitmentsMember |
| 2018 |
60us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears / us-gaap_LeaseArrangementTypeAxis = samg_MinimumLeaseCommitmentsMember |
| 2019 |
36us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter / us-gaap_LeaseArrangementTypeAxis = samg_MinimumLeaseCommitmentsMember |
| Total |
10,273us-gaap_OperatingLeasesFutureMinimumPaymentsDue / us-gaap_LeaseArrangementTypeAxis = samg_MinimumLeaseCommitmentsMember |
| Minimum Net Rentals | |
| Commitments And Contingencies [Line Items] | |
| 2015 |
3,267us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears / us-gaap_LeaseArrangementTypeAxis = samg_MinimumNetRentalsMember |
| 2016 |
3,220us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears / us-gaap_LeaseArrangementTypeAxis = samg_MinimumNetRentalsMember |
| 2017 |
2,510us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears / us-gaap_LeaseArrangementTypeAxis = samg_MinimumNetRentalsMember |
| 2018 |
60us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears / us-gaap_LeaseArrangementTypeAxis = samg_MinimumNetRentalsMember |
| 2019 |
36us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter / us-gaap_LeaseArrangementTypeAxis = samg_MinimumNetRentalsMember |
| Total |
9,093us-gaap_OperatingLeasesFutureMinimumPaymentsDue / us-gaap_LeaseArrangementTypeAxis = samg_MinimumNetRentalsMember |
| Non-cancellable Subleases | |
| Commitments And Contingencies [Line Items] | |
| 2015 |
(426)samg_OperatingLeasesFutureMinimumPaymentsDueFromSubleaseRentalsYearTwo / us-gaap_LeaseArrangementTypeAxis = samg_NoncancellableSubleasesMember |
| 2016 |
(426)samg_OperatingLeasesFutureMinimumPaymentsDueFromSubleaseRentalsYearThree / us-gaap_LeaseArrangementTypeAxis = samg_NoncancellableSubleasesMember |
| 2017 |
(328)samg_OperatingLeasesFutureMinimumPaymentsDueFromSubleaseRentalsYearFour / us-gaap_LeaseArrangementTypeAxis = samg_NoncancellableSubleasesMember |
| Total |
$ (1,180)samg_OperatingLeasesFutureMinimumPaymentsDueFromSubleaseRentals / us-gaap_LeaseArrangementTypeAxis = samg_NoncancellableSubleasesMember |
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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 four. 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 after 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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