Consolidated Statements of Changes in Shareholders' Equity
¥ in Thousands, $ in Thousands
CNY (¥)
USD ($)
Ordinary shares
CNY (¥)
shares
Ordinary shares
USD ($)
shares
Additional paid-in capital
CNY (¥)
Additional paid-in capital
USD ($)
Accumulated other comprehensive income
CNY (¥)
Accumulated other comprehensive income
USD ($)
Retained Earnings
CNY (¥)
Retained Earnings
USD ($)
Noncontrolling interests
CNY (¥)
Noncontrolling interests
USD ($)
Beginning balance, Amount at Dec. 31, 2014 ¥ 3,665,423   ¥ 7,484   ¥ 2,649,111   ¥ 5,932   ¥ 1,002,896      
Beginning balance, Shares at Dec. 31, 2014 | shares     110,602,163 110,602,163                
Net income / (loss) 990,649               990,649      
Other comprehensive income:                        
Foreign currency translation adjustments 56,821           56,821          
Exercise and vesting of share-based awards 30,198   ¥ 151   30,047              
Exercise and vesting of share-based awards, Shares | shares     2,452,407 2,452,407                
Share-based compensation 107,945       107,945              
Ending balance, Amount at Dec. 31, 2015 4,851,036   ¥ 7,635   2,787,103   62,753   1,993,545      
Ending balance, Shares at Dec. 31, 2015 | shares     113,054,570 113,054,570                
Net income / (loss) 1,216,223               1,227,914   ¥ (11,691)  
Other comprehensive income:                        
Foreign currency translation adjustments 62,256           62,256          
Capital injection from noncontrolling interests shareholder 2,500                   2,500  
Exercise and vesting of share-based awards 23,805   ¥ 149   23,656              
Exercise and vesting of share-based awards, Shares | shares     2,242,654 2,242,654                
Share-based compensation 195,393       195,393              
Ending balance, Amount at Dec. 31, 2016 6,351,213   ¥ 7,784   3,006,152   125,009   3,221,459   (9,191)  
Ending balance, Shares at Dec. 31, 2016 | shares     115,297,224 115,297,224                
Net income / (loss) 1,994,459 $ 306,542             2,001,619   (7,160)  
Other comprehensive income:                        
Foreign currency translation adjustments (55,055) (8,462)         (55,055)          
Dividends declared (RMB5.08 (US$0.76) per Class A ordinary share; RMB595,779 (US$91,570) to Class A ordinary shareholders) (595,779)               (595,779)      
Exercise and vesting of share-based awards 62,662   ¥ 125   62,537              
Exercise and vesting of share-based awards, Shares | shares     1,843,632 1,843,632                
Share-based compensation 177,786       177,786              
Ending balance, Amount at Dec. 31, 2017 ¥ 7,935,286 $ 1,219,632 ¥ 7,909 $ 1,216 ¥ 3,246,475 $ 498,974 ¥ 69,954 $ 10,752 ¥ 4,627,299 $ 711,203 ¥ (16,351) $ (2,513)
Ending balance, Shares at Dec. 31, 2017 | shares     117,140,856 117,140,856