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Common shares (Narrative) (Details)
$ / shares in Units, ¥ in Thousands, $ in Thousands
 1 Months Ended 12 Months Ended
Aug. 21, 2017
USD ($)
$ / shares
shares
Dec. 31, 2018
CNY (¥)
shares
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
CNY (¥)
shares
Dec. 31, 2016
CNY (¥)
shares
Dec. 31, 2015
shares
Common shares [Line Items]            
Aggregate consideration of common shares issued and sold to an independent institutional investor   ¥ (4,473) $ (651) ¥ 2,950,607 ¥ 0  
Class A common shares [Member]            
Common shares [Line Items]            
Aggregate consideration of common shares issued and sold to an independent institutional investor | $ $ 442,200          
Issue price per share | $ / shares $ 3.5          
Common shares, shares authorized   10,000,000,000 10,000,000,000 10,000,000,000 10,000,000,000  
Common shares, shares outstanding   981,740,848 981,740,848 945,245,908    
Class B common shares [Member]            
Common shares [Line Items]            
Common shares, shares authorized   1,000,000,000 1,000,000,000 1,000,000,000 1,000,000,000  
Common shares, shares outstanding   288,182,976 288,182,976 317,982,976    
Restricted shares [Member] | Class A common shares [Member]            
Common shares [Line Items]            
Issuance of common share (in shares)   6,694,940 6,694,940 21,305,880 11,887,180  
Common shares [Member] | Class A common shares [Member]            
Common shares [Line Items]            
Issuance of common share (in shares) 132,250,000     132,250,000    
Common shares, shares outstanding   981,740,848 981,740,848 945,245,908 750,115,028 728,227,848
Common shares [Member] | Class B common shares [Member]            
Common shares [Line Items]            
Conversion of Stock, Shares Converted   29,800,000 29,800,000 41,575,000 10,000,000  
Common shares, shares outstanding   288,182,976 288,182,976 317,982,976 359,557,976 369,557,976