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Share Based Award Plan - Additional Information (Detail) (Parent Company)
In Millions, except Share data, unless otherwise specified
12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2013
2008 Plan
Dec. 31, 2013
Restricted Stock
USD ($)
Dec. 31, 2013
Restricted Stock
CNY
Dec. 31, 2012
Restricted Stock
CNY
Dec. 31, 2011
Restricted Stock
CNY
Dec. 31, 2013
Restricted Stock
Minimum
Dec. 31, 2013
Restricted Stock
Maximum
Dec. 31, 2013
Stock Options
USD ($)
Dec. 31, 2013
Stock Options
CNY
Dec. 31, 2012
Stock Options
USD ($)
Dec. 31, 2012
Stock Options
CNY
Dec. 31, 2011
Stock Options
USD ($)
Dec. 31, 2011
Stock Options
CNY
Dec. 31, 2013
Employee Holding No More Than Ten Percent Voting Power
Maximum
Dec. 31, 2013
Employee Holding More Than Ten Percent Voting Power
Minimum
Dec. 31, 2013
Employee Holding More Than Ten Percent Voting Power
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Reserved ordinary shares for issuance under share-based awards plan   3,428,777                              
Maximum contractual term of share-based awards granted                             10 years   5 years
Percentage of voting power 10.00%                                
Percentage of the fair market value of the entity's ordinary shares                               110.00%  
Shares vesting term (in years)             2 years 4 years                  
Total intrinsic value of options exercised                 $ 18.87 114.21   200.91   275.86      
Unrecognized share-based compensation cost     107.86 652.94         59.02 357.31              
A weighted-average vesting period over which the deferred cost is expected to be recognized (in years)     2 years 9 months 29 days 2 years 9 months 29 days         2 years 10 months 24 days 2 years 10 months 24 days              
The weighted-average grant-date fair value of options granted during respective years                 $ 419.80   $ 323.00   $ 432.68        
Total fair value of shares vested during respective years, restricted shares     $ 40.84 247.24 128.70 198.77