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Common shares (Details)
¥ in Thousands
 12 Months Ended
Mar. 31, 2015
CNY (¥)
item
Nov. 21, 2012
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2015
CNY (¥)
shares
Dec. 31, 2014
CNY (¥)
shares
Dec. 31, 2013
CNY (¥)
shares
Dec. 31, 2014
$ / shares
shares
Dec. 31, 2012
shares
Common shares [Line Items]                
Issuance costs of common stock     ¥ 5,802    
Share repurchase program approved on May 4, 2014 and March 5, 2015 [Member]                
Common shares [Line Items]                
Number of share repurchase programs | item 2              
Share repurchase program authorized amount | ¥ ¥ 200,000              
Average purchase price per share | $ / shares     $ 54.82          
Shares repurchased value | ¥       ¥ 169,500        
Share repurchase programs, shares     3,092,556          
Class A common shares [Member]                
Common shares [Line Items]                
Issuance of common shares (in shares)   179,400,000 26,110,680 26,110,680 25,036,140 21,256,900    
Common stock, par value (in dollars per share) | $ / shares     $ 0.00001       $ 0.00001  
Common shares, shares authorized     10,000,000,000     10,000,000,000 10,000,000,000  
Common shares, shares issued     728,227,848     622,658,738 706,173,568  
Common shares, shares outstanding     728,227,848     622,658,738 706,173,568  
Class A common shares [Member] | Share repurchase program approved on May 4, 2014 and March 5, 2015 [Member]                
Common shares [Line Items]                
Average purchase price per share | $ / shares     $ 2.74          
Share repurchase programs, shares     61,851,120          
Class B common shares [Member]                
Common shares [Line Items]                
Common stock, par value (in dollars per share) | $ / shares     $ 0.00001       $ 0.00001  
Common shares, shares authorized     1,000,000,000     1,000,000,000 1,000,000,000  
Common shares, shares issued     369,557,976     485,831,386 427,352,696  
Common shares, shares outstanding     369,557,976     485,831,386 427,352,696  
Common shares [Member]                
Common shares [Line Items]                
Conversion of Stock, Shares Converted   548,408,914            
Common shares [Member] | Class A common shares [Member]                
Common shares [Line Items]                
Conversion of Stock, Shares Issued     57,794,720 57,794,720 58,478,690 422,001,838    
Common shares, shares outstanding     728,227,848     622,658,738 706,173,568 179,400,000
Common shares [Member] | Class B common shares [Member]                
Common shares [Line Items]                
Conversion of Stock, Shares Issued     57,794,720 57,794,720        
Conversion of Stock, Shares Converted     57,794,720 57,794,720 58,478,690 422,001,838    
Common shares, shares outstanding     369,557,976     485,831,386 427,352,696 907,833,224