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Share repurchase program (Details)
$ / shares in Units, ¥ in Thousands, $ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Sep. 30, 2015
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2016
CNY (¥)
shares
Repurchase of shares cost | ¥       ¥ 5,882,156
ADS        
Authorized amount $ 1,000,000      
Repurchase period (in months) 24 months      
Shares repurchased during the year (in ADS shares) | shares     31,065,784 31,065,784
Repurchase of shares cost     $ 800,000  
Repurchase price (in dollars per ADS) | $ / shares     $ 25.75  
Payments under share repurchase program involving capped call options     $ 300,000  
Proceeds from settlements under share repurchase program, involving capped call options   $ 107,239 216,220  
Prepaid amount for capped call options     100,000  
Remaining amount authorized under share repurchase program     $ 200,000