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Treasury Stock (Details) - New Share Repurchases Program [Member] - ADS [Member]
¥ in Millions, $ in Millions
 1 Months Ended 12 Months Ended
May 31, 2014
USD ($)
Dec. 31, 2015
CNY (¥)
shares
Dec. 31, 2015
USD ($)
shares
Dec. 31, 2014
CNY (¥)
shares
Dec. 31, 2014
USD ($)
shares
Dec. 31, 2015
USD ($)
shares
Equity, Class of Treasury Stock [Line Items]            
Share repurchase program, authorized amount | $ $ 50.0          
Share repurchase program, period in force 12 months          
Share repurchase program, shares, repurchased and cancelled during period   1,347,071 1,347,071 4,021,073 4,021,073  
Share repurchase program, consideration, repurchased and cancelled during period   ¥ 65.9 $ 10.8 ¥ 241.3 $ 39.2  
Aggregate shares repurchased, number of shares   5,368,144       5,368,144
Aggregate consideration of cancellation of repurchased shares   ¥ 308.9       $ 50.3
Cancellation fees   ¥ 1.7       $ 0.3