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Goodwill (Tables)
 12 Months Ended
Dec. 31, 2015
Goodwill [Abstract]  
Summary of changes in the carrying amount of goodwill
As of December 31,
2014   2015  
RMB   RMB     US$ (Note 2(d))  
Balance at the beginning of year —       —       —  
Increase in goodwill related to acquisitions     —       136,569       21,083  
Accumulated impairment loss     —       —       —  
Balance at the end of year     —       136,569       21,083