Quarterly report pursuant to Section 13 or 15(d)

Furniture, Equipment and Leasehold Improvements, Net - Summary of Furniture, Equipment and Leasehold Improvements, Net (Detail)

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Furniture, Equipment and Leasehold Improvements, Net - Summary of Furniture, Equipment and Leasehold Improvements, Net (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Property Plant And Equipment Useful Life And Values [Abstract]    
Leasehold improvements $ 3,857us-gaap_LeaseholdImprovementsGross $ 3,766us-gaap_LeaseholdImprovementsGross
Furniture and equipment 4,577us-gaap_FurnitureAndFixturesGross 4,496us-gaap_FurnitureAndFixturesGross
Artwork 421samg_ArtworkGross 421samg_ArtworkGross
Total cost 8,855us-gaap_PropertyPlantAndEquipmentGross 8,683us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation and amortization (6,466)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (6,329)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Furniture, equipment and leasehold improvements, net $ 2,389us-gaap_PropertyPlantAndEquipmentNet $ 2,354us-gaap_PropertyPlantAndEquipmentNet