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Other non-current assets (Tables)
 12 Months Ended
Dec. 31, 2015
Other non-current assets [Abstract]  
Schedule of other non-current assets
As of December 31,
2014   2015  
RMB   RMB     US$ (Note 2(d))  
Prepayment to suppliers - HNA —       324,680       50,123  
Yield enhancement products from Exchange and trust companies     —       300,267       46,353  
Other long term assets     15,368       24,534       3,785  
Balance at the end of year     15,368       649,481       100,261