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Convertible senior notes (Details)
$ / shares in Units, ¥ in Thousands, $ in Thousands
12 Months Ended
Nov. 04, 2014
Nov. 03, 2014
$ / shares
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2018
CNY (¥)
Mar. 15, 2017
USD ($)
Mar. 15, 2017
CNY (¥)
Nov. 02, 2014
Mar. 17, 2014
USD ($)
$ / shares
Mar. 17, 2014
CNY (¥)
Mar. 16, 2013
$ / shares
ADS                      
Convertible senior notes                      
ADS ratio to ordinary shares   0.20           2      
Ordinary shares, par value                 $ 0.001    
Notes                      
Convertible senior notes                      
Aggregate principal amount of convertible notes                 $ 632,500 ¥ 4,391,448  
Interest rate (as a percent)     1.50%   1.50%       1.50% 1.50%  
Redemption price due to fundamental change as percentage of principal amount     100.00% 100.00%              
Net proceeds from the Notes offering     $ 617,191 ¥ 4,285,157              
Discounts to initial purchaser     14,231   ¥ 98,806            
Debt issuance costs     $ 1,078 ¥ 7,485              
Redemption amount of debt           $ 3,125 ¥ 21,697        
Notes | ADS                      
Convertible senior notes                      
ADS ratio to ordinary shares                 0.2 0.2  
Conversion ratio 4.9693 49.693                  
Conversion price per US$1,000 of principal amount   $ 20.124                 $ 201.24