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Estimated Useful Lives of Definite Lived Intangible Assets (Detail)
6 Months Ended
Jun. 30, 2012
Customer and advertiser relationships | Minimum
 
Finite-Lived Intangible Assets [Line Items]  
Definite lived intangible assets, estimated useful lives 2 years
Customer and advertiser relationships | Maximum
 
Finite-Lived Intangible Assets [Line Items]  
Definite lived intangible assets, estimated useful lives 10 years
Developed technology and patents
 
Finite-Lived Intangible Assets [Line Items]  
Definite lived intangible assets, estimated useful lives 5 years
Trademarks and tradenames | Minimum
 
Finite-Lived Intangible Assets [Line Items]  
Definite lived intangible assets, estimated useful lives 3 years
Trademarks and tradenames | Maximum
 
Finite-Lived Intangible Assets [Line Items]  
Definite lived intangible assets, estimated useful lives 5 years
Services contract and other | Minimum
 
Finite-Lived Intangible Assets [Line Items]  
Definite lived intangible assets, estimated useful lives 1 year
Services contract and other | Maximum
 
Finite-Lived Intangible Assets [Line Items]  
Definite lived intangible assets, estimated useful lives 7 years