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Short-term borrowings (Details)
¥ in Thousands, $ in Thousands
Dec. 31, 2016
USD ($)
Dec. 31, 2016
CNY (¥)
Dec. 31, 2015
CNY (¥)
Short-term borrowings      
Short-term borrowings $ 1,200,247 ¥ 8,333,317 ¥ 3,040,209
Short-term borrowings      
Short-term borrowings      
Weighted average interest rate 4.91% 4.91% 4.40%