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Summary of Annual Rate of Depreciation on Property and Equipment (Detail)
 12 Months Ended
Dec. 31, 2012
Property, Plant and Equipment [Line Items]  
Leasehold improvements The shorter of term of the lease or the useful life of the asset
Minimum | Computers And Peripherals Equipment
  
Property, Plant and Equipment [Line Items]  
Annual rate of depreciation on property and equipment 33.00%
Minimum | Office Furniture And Equipment
  
Property, Plant and Equipment [Line Items]  
Annual rate of depreciation on property and equipment 10.00%
Minimum | Building
  
Property, Plant and Equipment [Line Items]  
Annual rate of depreciation on property and equipment 4.00%
Maximum | Computers And Peripherals Equipment
  
Property, Plant and Equipment [Line Items]  
Annual rate of depreciation on property and equipment 50.00%
Maximum | Office Furniture And Equipment
  
Property, Plant and Equipment [Line Items]  
Annual rate of depreciation on property and equipment 20.00%