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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, 2012 USD ($) | Dec. 31, 2012 CNY | Dec. 31, 2011 USD ($) | Dec. 31, 2011 CNY | Dec. 31, 2010 | Aug. 31, 2005 | Dec. 31, 2012 Preferred Stock USD ($) | Dec. 31, 2012 Class A Ordinary Shares USD ($) | Dec. 31, 2011 Class A Ordinary Shares | Dec. 31, 2012 Class B Ordinary Shares USD ($) | Dec. 31, 2011 Class B Ordinary Shares
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |
Issuance of Class B Ordinary shares upon conversion of all convertible preferred shares upon completion of IPO |  |  |  |  |  | 16,648,877 |  |  |  |  |
Common stock, shares authorized | 870,400,000 | 870,400,000 | 870,400,000 | 870,400,000 |  |  | 10,000,000 | 825,000,000 | 825,000,000 | 35,400,000 | 35,400,000
Par value per share (US$) | $ 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 | 40,000 | 40,000 | 1,332 | 1,332 | 650,000 |  |  |  |  |  |
Common stock, shares outstanding |  |  |  |  |  |  |  | 27,202,710 | 27,111,117 | 7,763,000 | 7,803,000
Minimum required percentage of each of the entity's PRC subsidiaries' after-tax profits to allocate to a general reserve fund | 10.00% | 10.00% |  |  |  |  |  |  |  |  |
Maximum requirement of each of the entity's PRC Subsidiaries' after-tax profits to be allocated to a general reserve fund as a percentage of each Subsidiaries' registered capital | 50.00% | 50.00% |  |  |  |  |  |  |  |  |
Minimum required percentage of each of the entity's PRC VIEs' after-tax profits to allocate to a statutory surplus fund | 10.00% | 10.00% |  |  |  |  |  |  |  |  |
Maximum requirement of each of the entity's PRC VIEs' after-tax profits to be allocated to a statutory surplus fund as a percentage of each VIEs' registered capital | 50.00% | 50.00% |  |  |  |  |  |  |  |  |
Amount of net assets of entity's PRC subsidiaries and VIEs restricted from being transferred to entity | $ 0.45 | 2.80 |  | 1.22 |  |  |  |  |  |  |

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