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Intangible assets, net - Schedule of Weighted Average Amortization Periods of Intangible Assets (Detail)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]    
Weighted average amortization periods of intangible assets 11 years 11 years
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 7 years
Non-compete agreement [Member]    
Finite-Lived Intangible Assets [Line Items]    
Weighted average amortization periods of intangible assets 4 years 4 years
Technology (including right-to-use) [Member]    
Finite-Lived Intangible Assets [Line Items]    
Weighted average amortization periods of intangible assets 8 years 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