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Principal Accounting Policies (Additional information) (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2016
CNY (¥)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
CNY (¥)
Dec. 31, 2014
CNY (¥)
Dec. 31, 2016
USD ($)
Dec. 30, 2016
¥ / $
Convenience translation [Abstract]            
Convenience translation, noon buying rate of US$ using RMB | ¥ / $           6.9430
Sales and marketing expenses [Abstract]            
Total advertising expenses ¥ 160,100 $ 23,100 ¥ 117,900 ¥ 64,400    
Employee social security and welfare benefits [Abstract]            
Employee social security and welfare benefits 72,600 10,500 75,600 73,700    
Recently issued accounting pronouncements [Abstract]            
Deferred tax assets classified as current 54,307   35,963   $ 7,822  
Deferred tax liabilities classified as current | ¥ 0          
Amount of changes in restricted cash included in investing activities ¥ 229,602 $ 33,070 ¥ 125,000 ¥ 0