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Share-based compensation (Details 3)
$ / shares in Units, ¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2016
CNY (¥)
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2015
CNY (¥)
shares
Dec. 31, 2014
USD ($)
$ / shares
shares
Dec. 31, 2014
CNY (¥)
shares
Additional disclosures            
Share-based compensation charge | ¥   ¥ 2,343,785   ¥ 1,193,945   ¥ 4,249,548
Non-employees | Share Incentive Plan | RSUs            
Number of Shares            
Unvested at the beginning of the year (in shares) | shares 477,186 477,186 414,965 414,965 30,000 30,000
Granted (in shares) | shares 878,726 878,726 300,000 300,000 389,965 389,965
Vested (in shares) | shares (145,514) (145,514) (237,779) (237,779) (5,000) (5,000)
Forfeited (in shares) | shares (158,000) (158,000)        
Unvested at the end of the year (in shares) | shares 1,052,398 1,052,398 477,186 477,186 414,965 414,965
Weighted-Average Grant-Date Fair Value            
Unvested at the beginning of the year (in dollars per share) | $ / shares $ 11.02   $ 7.65   $ 3.96  
Granted (in dollars per share) | $ / shares 10.98   12.94   7.89  
Vested (in dollars per share) | $ / shares 10.61   7.56   3.96  
Forfeited (in dollars per share) | $ / shares 10.83          
Unvested at the end of the year (in dollars per share) | $ / shares $ 11.07   $ 11.02   $ 7.65  
Additional disclosures            
Share-based compensation charge | ¥   ¥ 23,581   ¥ 23,305   ¥ 15,917
Unrecognized share-based compensation expense related to awards other than options | ¥   ¥ 70,657        
Weighted-average period over which share-based compensation expense is expected to be recognized 5 years 5 years        
Total fair value of RSUs vested | $ $ 1,841   $ 3,645   $ 61  
Total intrinsic value of RSUs vested | $ $ 1,841   $ 3,645   $ 61