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Short-term deposits (Details)
¥ in Thousands, $ in Thousands
Dec. 31, 2016
CNY (¥)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
CNY (¥)
Dec. 31, 2015
USD ($)
Short Term Deposits [Line Items]        
Short-term deposits ¥ 3,751,519 $ 540,331 ¥ 1,894,946  
RMB [Member]        
Short Term Deposits [Line Items]        
Short-term deposits 1,235,000   250,000  
US$ [Member]        
Short Term Deposits [Line Items]        
Short-term deposits ¥ 2,516,519 $ 362,882 ¥ 1,644,946 $ 253,322