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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
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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

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