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Weighted Average Useful lives From Date of Purchase of Intangible Assets (Detail)
12 Months Ended
Dec. 31, 2011
Year
Land use right
 
Finite-Lived Intangible Assets [Line Items]  
Finite-lived intangible asset weighted average useful life (in years) 50
Customer relationships
 
Finite-Lived Intangible Assets [Line Items]  
Finite-lived intangible asset weighted average useful life (in years) 9.3
Software
 
Finite-Lived Intangible Assets [Line Items]  
Finite-lived intangible asset weighted average useful life (in years) 4.8
Trademarks
 
Finite-Lived Intangible Assets [Line Items]  
Finite-lived intangible asset weighted average useful life (in years) 10
User List
 
Finite-Lived Intangible Assets [Line Items]  
Finite-lived intangible asset weighted average useful life (in years) 3.0
Others
 
Finite-Lived Intangible Assets [Line Items]  
Finite-lived intangible asset weighted average useful life (in years) 4.2