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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