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Capital structure (Details)
¥ in Thousands, $ in Thousands
 1 Months Ended 12 Months Ended
Sep. 15, 2014
item
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2017
CNY (¥)
shares
Dec. 31, 2018
shares
Dec. 31, 2017
CNY (¥)
shares
Dec. 31, 2016
shares
Nov. 03, 2014
Nov. 02, 2014
Capital Structure                
Total consideration for shares issued to investors | ¥         ¥ 5,610,337      
Shares issued as a result of exercises of share options by employees and a consultant       356,736 454,708 560,930    
Treasury shares re-issued to employees for share awards (in shares)       0 1,356,918 257,217    
Tencent Holdings Limited                
Capital Structure                
Total consideration for shares issued to investors   $ 603,605 ¥ 3,927,236          
JD.com, Inc.                
Capital Structure                
Total consideration for shares issued to investors   $ 258,688 ¥ 1,683,101          
Class B ordinary shares                
Capital Structure                
Number of votes entitled per share | item 10              
ADS                
Capital Structure                
ADS ratio to ordinary shares             0.20 2
Class A ordinary shares                
Capital Structure                
Number of votes entitled per share | item 1              
Shares issued as a result of exercises of share options by employees and a consultant       356,736   560,930    
Re-issuance of treasury shares as a result of exercise of share options (in shares)         454,708      
Issuance of ordinary shares as a result of vesting of shares awards (in shares)       1,322,560 23,413 861,815    
Class A ordinary shares | Tencent Holdings Limited                
Capital Structure                
Number of shares issued to investors   9,229,437 9,229,437          
Class A ordinary shares | JD.com, Inc.                
Capital Structure                
Number of shares issued to investors   3,955,473 3,955,473