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Weighted Average Useful Lives from Date of Purchase of Intangible Assets (Detail)
12 Months Ended
Dec. 31, 2017
Land use right  
Finite-Lived Intangible Assets [Line Items]  
Finite-lived intangible asset weighted average economic life 50 years
Customer relationships  
Finite-Lived Intangible Assets [Line Items]  
Finite-lived intangible asset weighted average economic life 3 years
Software  
Finite-Lived Intangible Assets [Line Items]  
Finite-lived intangible asset weighted average economic life 4 years
Trademarks  
Finite-Lived Intangible Assets [Line Items]  
Finite-lived intangible asset weighted average economic life 10 years
User list  
Finite-Lived Intangible Assets [Line Items]  
Finite-lived intangible asset weighted average economic life 3 years
Licensed copyrights of video contents  
Finite-Lived Intangible Assets [Line Items]  
Finite-lived intangible asset weighted average economic life 3 years
Others  
Finite-Lived Intangible Assets [Line Items]  
Finite-lived intangible asset weighted average economic life 6 years