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Short-term deposits (Details)
¥ in Thousands, $ in Thousands
Dec. 31, 2015
CNY (¥)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
CNY (¥)
Dec. 31, 2014
USD ($)
Short-term deposits        
Short-term deposits ¥ 1,894,946 $ 292,529 ¥ 4,214,576  
RMB [Member]        
Short-term deposits        
Short-term deposits 250,000   1,921,520  
US$ [Member]        
Short-term deposits        
Short-term deposits ¥ 1,644,946 $ 253,322 ¥ 2,293,056 $ 374,685