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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2014
Earnings Per Share [Abstract] |
Schedule of Basic and Diluted Earnings Per Share | Basic and diluted earnings per share for each of the years presented are calculated as follows:
|  |  |  |  | Year ended December 31, |
|  | 2012 |  |  | 2013 |  |  | 2014 |
|  | Ordinary shares |  |  | Class A |  |  | Class B |  |  | Class A |  |  | Class A |  |  | Class B |  |  | Class B |
|  | RMB |  |  | RMB |  |  | RMB |  |  | RMB |  |  | US$ |  |  | RMB |  |  | US$ |
Basic earnings per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  | 212,881 |  |  |  | 142,053 |  |  |  | 314,109 |  |  |  | 270,988 |  |  |  | 43,675 |  |  |  | 477,692 |  |  |  | 76,990 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average ordinary shares outstanding |  |  | 100,000,000 |  |  |  | 31,109,214 |  |  |  | 68,788,940 |  |  |  | 38,633,284 |  |  |  | 38,633,284 |  |  |  | 68,102,019 |  |  |  | 68,102,019 |
Basic earnings per share |  |  | 2.13 |  |  |  | 4.57 |  |  |  | 4.57 |  |  |  | 7.01 |  |  |  | 1.13 |  |  |  | 7.01 |  |  |  | 1.13 |
Diluted earnings per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  | 212,881 |  |  |  | 155,394 |  |  |  | 300,768 |  |  |  | 296,797 |  |  |  | 47,835 |  |  |  | 451,883 |  |  |  | 72,830 |
Reallocation of net income as a result of conversion of Class B into Class A ordinary shares (Note 13) |  |  | — |  |  |  | 300,768 |  |  |  | — |  |  |  | 451,883 |  |  |  | 72,830 |  |  |  | — |  |  |  | — |
Net income |  |  | 212,881 |  |  |  | 456,162 |  |  |  | 300,768 |  |  |  | 748,680 |  |  |  | 120,665 |  |  |  | 451,883 |  |  |  | 72,830 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average ordinary shares outstanding |  |  | 100,000,000 |  |  |  | 31,109,214 |  |  |  | 68,788,940 |  |  |  | 38,633,284 |  |  |  | 38,633,284 |  |  |  | 68,102,019 |  |  |  | 68,102,019 |
Conversion of Class B into Class A ordinary shares (Note 13) |  |  | — |  |  |  | 68,788,940 |  |  |  | — |  |  |  | 68,102,019 |  |  |  | 68,102,019 |  |  |  | — |  |  |  | — |
Dilutive effect of share-based awards |  |  | 650,652 |  |  |  | 4,431,072 |  |  |  | — |  |  |  | 6,096,282 |  |  |  | 6,096,282 |  |  |  | — |  |  |  | — |
Weighted-average number of shares outstanding- diluted |  |  | 100,650,652 |  |  |  | 104,329,226 |  |  |  | 68,788,940 |  |  |  | 112,831,585 |  |  |  | 112,831,585 |  |  |  | 68,102,019 |  |  |  | 68,102,019 |
Diluted earnings per share |  |  | 2.12 |  |  |  | 4.37 |  |  |  | 4.37 |  |  |  | 6.64 |  |  |  | 1.07 |  |  |  | 6.64 |  |  |  | 1.07 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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