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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