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Earnings Per Share - Schedule of Basic and Diluted Earnings Per Share (Detail)
In Thousands, except Share data, unless otherwise specified
 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2014
USD ($)
Sep. 30, 2014
CNY
Sep. 30, 2013
CNY
Dec. 31, 2013
USD ($)
Dec. 31, 2013
CNY
Dec. 31, 2012
CNY
Dec. 31, 2011
CNY
Sep. 30, 2013
Ordinary Shares, Class A Ordinary Shares and Class B Ordinary Shares [Member]
CNY
Dec. 31, 2012
Ordinary Shares, Class A Ordinary Shares and Class B Ordinary Shares [Member]
CNY
Dec. 31, 2011
Ordinary Shares, Class A Ordinary Shares and Class B Ordinary Shares [Member]
CNY
Sep. 30, 2014
Class A Ordinary Shares [Member]
USD ($)
Sep. 30, 2014
Class A Ordinary Shares [Member]
CNY
Dec. 31, 2013
Class A Ordinary Shares [Member]
USD ($)
Dec. 31, 2013
Class A Ordinary Shares [Member]
CNY
Sep. 30, 2014
Class B Ordinary Shares [Member]
USD ($)
Sep. 30, 2014
Class B Ordinary Shares [Member]
CNY
Dec. 31, 2013
Class B Ordinary Shares [Member]
USD ($)
Dec. 31, 2013
Class B Ordinary Shares [Member]
CNY
Numerator:                                    
Income from continuing operations $ 81,317 499,123 333,485 $ 75,352 456,162 212,881 135,446   212,881 135,446     $ 23,465 142,053     $ 51,887 314,109
Loss from discontinued operations       0 0 0 (4,182)   0 (4,182)     0 0     0 0
Net income 81,317 499,123 333,485 75,352 456,162 212,881 131,264 333,485 212,881 131,264 28,514 175,021 23,465 142,053 52,803 324,102 51,887 314,109
Denominator:                                    
Weighted average ordinary shares outstanding     100,000,000     100,000,000 100,000,000 100,000,000 100,000,000 100,000,000 37,147,194 37,147,194 31,109,214 31,109,214 68,788,940 68,788,940 68,788,940 68,788,940
Income from continuing operations                 2.13 1.35     $ 0.75 4.57     $ 0.75 4.57
Loss from discontinued operations                    (0.04)                    
Basic earnings per share Net income $ 0.77 4.71 3.33 $ 0.75 4.57 2.13 1.31 3.33 2.13 1.31 $ 0.77 4.71 $ 0.75 4.57 $ 0.77 4.71 $ 0.75 4.57
Numerator:                                    
Income from continuing operations                 212,881 135,446     25,669 155,394     49,683 300,768
Net income               333,485     31,599 193,956     49,718 305,167    
Loss from discontinued operations       0 0 0 (4,182)   0 (4,182)     0 0     0 0
Reallocation of undistributed income from continuing operations as a result of conversion of Class B to Class A ordinary shares                       49,718 305,167 49,683 300,768          
Net income               333,485 212,881 131,264 $ 81,317 499,123 $ 75,352 456,162 $ 49,718 305,167 $ 49,683 300,768
Denominator:                                    
Weighted average ordinary shares outstanding     100,000,000     100,000,000 100,000,000 100,000,000 100,000,000 100,000,000 37,147,194 37,147,194 31,109,214 31,109,214 68,788,940 68,788,940 68,788,940 68,788,940
Conversion of Class B to Class A ordinary shares                       68,788,940 68,788,940 68,788,940 68,788,940          
Dilutive effect of stock options               1,322,763 650,652 189,928 6,573,095 6,573,095 4,431,072 4,431,072          
Weighted-average number of shares outstanding- diluted     101,322,763     100,650,652 100,189,928 101,322,763 100,650,652 100,189,928 112,509,229 112,509,229 104,329,226 104,329,226 68,788,940 68,788,940 68,788,940 68,788,940
Income from continuing operations                 2.12 1.35     $ 0.72 4.37     $ 0.72 4.37
Loss from discontinued operations                    (0.04)                    
Diluted earnings per share Net income $ 0.72 4.44 3.29 $ 0.72 4.37 2.12 1.31 3.29 2.12 1.31 $ 0.72 4.44 $ 0.72 4.37 $ 0.72 4.44 $ 0.72 4.37