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Property and Equipment Net (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]    
Leasehold improvements $ 7,977us-gaap_LeaseholdImprovementsGross $ 7,160us-gaap_LeaseholdImprovementsGross
Property and equipment, gross 102,707us-gaap_PropertyPlantAndEquipmentGross 97,274us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation 61,158us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment 59,283us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property and equipment, net 41,549us-gaap_PropertyPlantAndEquipmentNet 37,991us-gaap_PropertyPlantAndEquipmentNet
Computers and peripheral equipment    
Property, Plant and Equipment [Line Items]    
Machinery and equipment, gross 48,159us-gaap_MachineryAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ComputerEquipmentMember
48,252us-gaap_MachineryAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ComputerEquipmentMember
Office furniture and equipment    
Property, Plant and Equipment [Line Items]    
Machinery and equipment, gross 6,636us-gaap_MachineryAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OfficeEquipmentMember
6,324us-gaap_MachineryAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OfficeEquipmentMember
Building    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 39,935us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember
$ 35,538us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember