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Principal accounting policies (Schedule of Amortization of Finite-lived Intangible Assets is Computed Using Straight-line Method Over Following Estimated Useful Lives) (Details)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Brand names [Member]    
Intangible assets, net [Line Items]    
Estimated useful lives   10 years
Brand names [Member] | Minimum [Member]    
Intangible assets, net [Line Items]    
Estimated useful lives 1 year  
Brand names [Member] | Maximum [Member]    
Intangible assets, net [Line Items]    
Estimated useful lives 15 years  
Software [Member]    
Intangible assets, net [Line Items]    
Estimated useful lives 5 years 5 years
Software [Member] | Minimum [Member]    
Intangible assets, net [Line Items]    
Estimated useful lives 3 years  
Software [Member] | Maximum [Member]    
Intangible assets, net [Line Items]    
Estimated useful lives 5 years  
Domain names [Member]    
Intangible assets, net [Line Items]    
Estimated useful lives 15 years 15 years
Technology [Member]    
Intangible assets, net [Line Items]    
Estimated useful lives 5 years  
Others [Member] | Minimum [Member]    
Intangible assets, net [Line Items]    
Estimated useful lives 3 years 3 years
Others [Member] | Maximum [Member]    
Intangible assets, net [Line Items]    
Estimated useful lives 5 years 5 years