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Fixed Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]    
Property plant and equipment gross $ 36,507us-gaap_PropertyPlantAndEquipmentGross $ 34,133us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation (28,407)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (27,730)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property plant and equipment net 8,100us-gaap_PropertyPlantAndEquipmentNet 6,403us-gaap_PropertyPlantAndEquipmentNet
Equipment    
Property, Plant and Equipment [Line Items]    
Property plant and equipment gross 25,749us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_EquipmentMember		 25,673us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_EquipmentMember
Leasehold Improvements    
Property, Plant and Equipment [Line Items]    
Property plant and equipment gross 9,220us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember		 8,253us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
Construction in progress    
Property, Plant and Equipment [Line Items]    
Property plant and equipment gross $ 1,538us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember		 $ 207us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember