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SHAREHOLDERS' EQUITY - Additional Information (Detail)
In Billions, except Share data, unless otherwise specified
 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2011
USD ($)
Dec. 31, 2010
USD ($)
Dec. 31, 2009
Aug. 31, 2005
Dec. 31, 2011
PRC
USD ($)
Dec. 31, 2011
PRC
CNY
Dec. 31, 2010
PRC
CNY
Dec. 31, 2011
Preferred Shares
USD ($)
Dec. 31, 2011
Class A Ordinary Shares
USD ($)
Dec. 31, 2010
Class A Ordinary Shares
USD ($)
Dec. 31, 2011
Class B Ordinary Shares
USD ($)
Dec. 31, 2010
Class B Ordinary Shares
USD ($)
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 $ 0.00005 $ 0.00005
Number of votes per share                 1   10  
Transfer of Class B ordinary shares to Class A Ordinary shares 1,332 650,000 419,654                  
Common stock, shares outstanding                 27,111,117 27,045,340 7,803,000 7,804,332
Minimum required percentage of each of the entity's PRC subsidiaries' after-tax profits to allocate to a general reserve fund 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%                      
Minimum required percentage of each of the entity's PRC VIEs' after-tax profits to allocate to a statutory surplus fund 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%                      
Minimum required percentage of each of the entity's PRC VIEs' after-tax profits to allocate to a statutory public welfare fund 5.00%                      
Maximum required percentage of each of the entity's PRC VIEs' after-tax profits to allocate to a statutory public welfare fund 10.00%                      
Amount of net assets of entity's PRC subsidiaries and VIEs restricted from being transferred to entity         $ 0.19 1.22 1.15