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Useful Lives of Assets (Detail)
 12 Months Ended
Dec. 31, 2014
Buildings  
Property, Plant and Equipment [Line Items]  
Useful lives, maximum years 40 years
Building Improvements | Minimum  
Property, Plant and Equipment [Line Items]  
Useful lives, maximum years 5 years
Building Improvements | Maximum  
Property, Plant and Equipment [Line Items]  
Useful lives, maximum years 10 years
Leasehold Improvements  
Property, Plant and Equipment [Line Items]  
Useful lives, description Lesser of lease term or 10 years
Furniture and Fixtures  
Property, Plant and Equipment [Line Items]  
Useful lives, maximum years 10 years
Test Systems Manufactured Internally  
Property, Plant and Equipment [Line Items]  
Useful lives, maximum years 6 years
Machinery and Equipment | Minimum  
Property, Plant and Equipment [Line Items]  
Useful lives, maximum years 3 years
Machinery and Equipment | Maximum  
Property, Plant and Equipment [Line Items]  
Useful lives, maximum years 5 years
Software | Minimum  
Property, Plant and Equipment [Line Items]  
Useful lives, maximum years 3 years
Software | Maximum  
Property, Plant and Equipment [Line Items]  
Useful lives, maximum years 5 years