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Intangible Assets, Net - Schedule of Weighted Average Amortization Periods of Intangible Assets (Detail)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]    
Weighted average amortization periods of intangible assets 3 years 11 months 19 days 4 years 15 days
Content Copyrights [Member]    
Finite-Lived Intangible Assets [Line Items]    
Weighted average amortization periods of intangible assets 2 years 9 months 11 days 2 years 9 months 29 days
Land use right [Member]    
Finite-Lived Intangible Assets [Line Items]    
Weighted average amortization periods of intangible assets 30 years 30 years
Trademarks [Member]    
Finite-Lived Intangible Assets [Line Items]    
Weighted average amortization periods of intangible assets 7 years  
Non-compete agreement [Member]    
Finite-Lived Intangible Assets [Line Items]    
Weighted average amortization periods of intangible assets 4 years  
Technology (including right-to-use) [Member]    
Finite-Lived Intangible Assets [Line Items]    
Weighted average amortization periods of intangible assets 8 years  
Acquired computer software [Member]    
Finite-Lived Intangible Assets [Line Items]    
Weighted average amortization periods of intangible assets 5 years 5 years
Internal use software development costs [Member]    
Finite-Lived Intangible Assets [Line Items]    
Weighted average amortization periods of intangible assets 5 years 5 years
Online game licenses [Member]    
Finite-Lived Intangible Assets [Line Items]    
Weighted average amortization periods of intangible assets 3 years 3 years
Domain name [Member]    
Finite-Lived Intangible Assets [Line Items]    
Weighted average amortization periods of intangible assets 5 years 5 years