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Treasury shares (Details)
¥ in Thousands, $ in Millions
12 Months Ended
Nov. 17, 2015
USD ($)
Dec. 31, 2018
shares
Dec. 31, 2017
shares
Dec. 31, 2016
CNY (¥)
shares
Treasury shares        
Repurchase of treasury stock (in shares)       1,614,135
Repurchase of treasury stock | ¥       ¥ 844,711
Treasury stock, shares   0    
Payables for repurchase of ordinary shares | ¥       ¥ 194,514
Treasury shares re-issued to employees for share awards (in shares)   0 1,356,918 257,217
ADS        
Treasury shares        
Term of share repurchase program 24 months      
ADS | Maximum        
Treasury shares        
Stock repurchase program, authorized amount | $ $ 300