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Shareholder's Equity - Additional Information (Detail) In Billions, except Share data, unless otherwise specified | 12 Months Ended |  |  | 12 Months Ended |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2013 USD ($) | Dec. 31, 2013 CNY | Dec. 31, 2012 USD ($) | Dec. 31, 2012 CNY | Dec. 31, 2011 | Aug. 31, 2005 | Dec. 31, 2013 Preferred Stock USD ($) | Dec. 31, 2013 Class A Ordinary Shares USD ($) | Dec. 31, 2012 Class A Ordinary Shares | Dec. 31, 2013 Class B Ordinary Shares USD ($) | Dec. 31, 2012 Class B Ordinary Shares
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |
Issuance of Class B Ordinary shares upon conversion of all convertible preferred shares upon completion of IPO |  |  |  |  |  | 16,648,877 |  |  |  |  |
Common stock, shares authorized | 870,400,000 | 870,400,000 |  |  |  |  | 10,000,000 | 825,000,000 | 825,000,000 | 35,400,000 | 35,400,000
Par value per share (US$) | $ 0.00005 |  | $ 0.00005 |  |  |  | $ 0.00005 | $ 0.00005 |  | $ 0.00005 |
Number of votes per share |  |  |  |  |  |  |  | 1 |  | 10 |
Transfer of Class B ordinary shares to Class A Ordinary shares | 225,079 | 225,079 | 40,000 | 40,000 | 1,332 |  |  |  |  |  |
Common stock, shares outstanding |  |  |  |  |  |  |  | 27,492,452 | 27,202,710 | 7,537,921 | 7,763,000
Allocation of after-tax profits to general reserve fund, percentage | 10.00% | 10.00% |  |  |  |  |  |  |  |  |
Limit of general reserve fund as a percentage of registered capital, after which allocations to general reserve fund are no longer required | 50.00% | 50.00% |  |  |  |  |  |  |  |  |
Allocation of after-tax profits to statutory surplus fund, percentage | 10.00% | 10.00% |  |  |  |  |  |  |  |  |
Limit of statutory surplus fund as a percentage of registered capital, after which allocations to statutory surplus fund are no longer required | 50.00% | 50.00% |  |  |  |  |  |  |  |  |
Amounts of restricted paid up capital and statutory reserve funds of PRC subsidaries and net assets of VIEs | $ 0.61 | 3.72 |  | 2.80 |  |  |  |  |  |  |

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- Definition Represents the ratio of the general reserve fund to statutory registered capital after which mandatory contributions to the general reserve fund are no longer required for foreign-invested enterprises established in the People's Republic of China. + References No definition available. + Details
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