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Re-designation of Series B Preferred Shares (Details)
¥ in Thousands, $ in Thousands
1 Months Ended 12 Months Ended
Sep. 21, 2010
shares
Dec. 31, 2013
CNY (¥)
shares
Dec. 31, 2015
USD ($)
Dec. 31, 2015
CNY (¥)
Dec. 31, 2014
CNY (¥)
Dec. 31, 2013
CNY (¥)
Re-designation of Series B Preferred Shares            
Foreign currency translation adjustments     $ 182,538 ¥ 1,182,445 ¥ (121,612) ¥ (137,921)
Series B convertible preferred shares            
Re-designation of Series B Preferred Shares            
Conversion of preferred shares to ordinary shares (in shares) | shares 15,498,980 25,247,161        
Adjustments to additional paid-in capital   ¥ 34,108        
Foreign currency translation adjustments   ¥ 4,065