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Property and Equipment Net (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]    
Leasehold improvements $ 8,769 $ 7,977
Property and equipment, gross 116,745 102,707
Accumulated depreciation 68,053 61,158
Property and equipment, net 48,692 41,549
Computers and peripheral equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 53,937 48,159
Office furniture and equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 7,332 6,636
Building    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 46,707 $ 39,935