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Share repurchase program (Details)
$ / shares in Units, ¥ in Thousands, $ in Thousands
1 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
Sep. 30, 2015
USD ($)
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2018
CNY (¥)
shares
Dec. 31, 2017
USD ($)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2016
CNY (¥)
shares
Repurchase of shares cost       ¥ 205,886       ¥ 5,882,156
Payments under share repurchase program involving capped call options               2,007,100
Proceeds from settlement of capped call options           ¥ 737,501   ¥ 1,463,218
ADS                
Authorized amount | $ $ 1,000,000 $ 1,000,000 $ 1,000,000          
Repurchase period (in months) 12 months 24 months            
Shares repurchased during the year (in ADS shares) | shares     1,396,200 1,396,200     31,065,784 31,065,784
Repurchase of shares cost     $ 29,999 ¥ 205,886     $ 800,000 ¥ 5,338,276
Weighted average repurchase price (in dollars per ADS) | $ / shares     $ 21.48       $ 25.75  
Payments under share repurchase program involving capped call options             $ 300,000 2,007,100
Proceeds from settlement of capped call options         $ 107,239 ¥ 737,501 $ 216,220 ¥ 1,463,218