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Accumulated other comprehensive loss (Tables)
 12 Months Ended
Dec. 31, 2019
Accumulated other comprehensive loss  
Schedule of accumulated other comprehensive income by component
The changes in accumulated other comprehensive loss by component are as follows:
                         
 
Cumulative
Translation
Adjustments
 
  
Unrealized Gain and
(Loss) on
Available-for-sale
Securities
 
  
Total
 
 
RMB
 
  
RMB
 
  
RMB
 
Balance as of January 1, 2017
   
(366,148
 )    
22,540
     
(343,608
 )
                         
Foreign currency translation, net of tax of nil
   
342,348
     
—  
      
342,348
 
Fair value changes of
available-for-sale
investments, net of tax of nil
    
—  
      
32,633
     
32,633
 
Reclassification adjustment for gains included in net income, net of tax of nil
   
—  
      
(55,615
 )    
(55,615
 )
                         
Balance as of December 31, 2017
   
(23,800
 )    
(442
 )    
(24,242
 )
                         
Adoption of ASU
2016-01
   
—
      
442
     
442
 
Foreign currency translation, net of tax of nil
   
(7,083
 )    
—  
      
(7,083
 )
                         
Balance as of December 31, 2018
   
(30,883
 )    
—  
      
(30,883
 )
                         
Foreign currency translation, net of tax of nil
   
(25,773
 )     
—
     
(25,773
 ) 
                         
Balance as of December 31, 2019
   
(56,656
 )     
—  
      
(56,656
 )