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Short-term bank loans (Details)
$ in Thousands
Mar. 07, 2014
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2015
CNY (¥)
Dec. 31, 2014
USD ($)
Dec. 31, 2014
CNY (¥)
Short-term bank loans          
Short-term bank loans   $ 469,327 ¥ 3,040,209,000   ¥ 1,890,771,000
Time deposits pledged to secure bank loan | ¥     ¥ 4,320,000,000   0
Weighted average interest rate   5.30% 5.30%    
Short-term bank loan entered in March 2014          
Short-term bank loans          
Short-term bank loans | ¥         ¥ 1,890,771,000
Bank loan          
Short-term bank loans          
Short-term bank loans | $       $ 309,000  
Weighted average interest rate   4.40% 4.40%    
Bank loan | Short-term bank loan entered in March 2014          
Short-term bank loans          
Time deposits pledged to secure bank loan | $ $ 309,000        
Bank loan | Short-term bank loan entered in March 2014 | 1-month LIBOR          
Short-term bank loans          
Percentage over variable rate basis 0.80%